diff --git a/examples/device/board_test/CMakeLists.txt b/examples/device/board_test/CMakeLists.txt
index f0437dd04..c09ffe215 100644
--- a/examples/device/board_test/CMakeLists.txt
+++ b/examples/device/board_test/CMakeLists.txt
@@ -7,7 +7,7 @@ set(TOP "../../..")
 get_filename_component(TOP "${TOP}" REALPATH)
 
 # Add example src and bsp directories
-set(EXTRA_COMPONENT_DIRS "src" "${TOP}/hw/bsp/${BOARD}")
+set(EXTRA_COMPONENT_DIRS "src" "${TOP}/hw/bsp/esp32s2/boards" "${TOP}/hw/bsp/esp32s2/components")
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 set(SUPPORTED_TARGETS esp32s2)
diff --git a/examples/device/cdc_msc_freertos/CMakeLists.txt b/examples/device/cdc_msc_freertos/CMakeLists.txt
index 339f43a09..146b49cb0 100644
--- a/examples/device/cdc_msc_freertos/CMakeLists.txt
+++ b/examples/device/cdc_msc_freertos/CMakeLists.txt
@@ -7,7 +7,7 @@ set(TOP "../../..")
 get_filename_component(TOP "${TOP}" REALPATH)
 
 # Add example src and bsp directories
-set(EXTRA_COMPONENT_DIRS "src" "${TOP}/hw/bsp/${BOARD}")
+set(EXTRA_COMPONENT_DIRS "src" "${TOP}/hw/bsp/esp32s2/boards" "${TOP}/hw/bsp/esp32s2/components")
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 set(SUPPORTED_TARGETS esp32s2)
diff --git a/examples/device/hid_composite_freertos/CMakeLists.txt b/examples/device/hid_composite_freertos/CMakeLists.txt
index a429a1336..3c48e4e70 100644
--- a/examples/device/hid_composite_freertos/CMakeLists.txt
+++ b/examples/device/hid_composite_freertos/CMakeLists.txt
@@ -7,7 +7,7 @@ set(TOP "../../..")
 get_filename_component(TOP "${TOP}" REALPATH)
 
 # Add example src and bsp directories
-set(EXTRA_COMPONENT_DIRS "src" "${TOP}/hw/bsp/${BOARD}")
+set(EXTRA_COMPONENT_DIRS "src" "${TOP}/hw/bsp/esp32s2/boards" "${TOP}/hw/bsp/esp32s2/components")
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 set(SUPPORTED_TARGETS esp32s2)
diff --git a/examples/make.mk b/examples/make.mk
index 992a4e60e..bf3b36a62 100644
--- a/examples/make.mk
+++ b/examples/make.mk
@@ -2,14 +2,8 @@
 # Common make definition for all examples
 # ---------------------------------------
 
-#-------------- Select the board to build for. ------------
-BOARD_LIST = $(sort $(subst /.,,$(subst $(TOP)/hw/bsp/,,$(wildcard $(TOP)/hw/bsp/*/.))))
-
-ifeq ($(filter $(BOARD),$(BOARD_LIST)),)
-  $(info You must provide a BOARD parameter with 'BOARD=', supported boards are:)
-  $(foreach b,$(BOARD_LIST),$(info - $(b)))
-  $(error Invalid BOARD specified)
-endif
+# Build directory
+BUILD = _build/build-$(BOARD)
 
 # Handy check parameter function
 check_defined = \
@@ -19,11 +13,37 @@ __check_defined = \
     $(if $(value $1),, \
     $(error Undefined make flag: $1$(if $2, ($2))))
     
-# Build directory
-BUILD = _build/build-$(BOARD)
+#-------------- Select the board to build for. ------------
+#BOARD_LIST = $(sort $(subst /.,,$(subst $(TOP)/hw/bsp/,,$(wildcard $(TOP)/hw/bsp/*/.))))
+#ifeq ($(filter $(BOARD),$(BOARD_LIST)),)
+#  $(info You must provide a BOARD parameter with 'BOARD=', supported boards are:)
+#  $(foreach b,$(BOARD_LIST),$(info - $(b)))
+#  $(error Invalid BOARD specified)
+#endif
 
-# Board specific define
-include $(TOP)/hw/bsp/$(BOARD)/board.mk
+# Board without family
+BOARD_PATH := $(subst $(TOP)/,,$(wildcard $(TOP)/hw/bsp/$(BOARD)))
+FAMILY :=
+
+# Board within family
+ifeq ($(BOARD_PATH),)
+  BOARD_PATH := $(subst $(TOP)/,,$(wildcard $(TOP)/hw/bsp/*/boards/$(BOARD)))
+  FAMILY := $(word 3, $(subst /, ,$(BOARD_PATH)))
+  FAMILY_PATH = hw/bsp/$(FAMILY)
+endif
+
+ifeq ($(BOARD_PATH),)
+  $(error Invalid BOARD specified)
+endif
+
+ifeq ($(FAMILY),)
+  include $(TOP)/hw/bsp/$(BOARD)/board.mk
+else
+  # Include Family and Board specific defs
+  include $(TOP)/$(FAMILY_PATH)/family.mk
+
+  SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/$(FAMILY_PATH)/*.c))
+endif
 
 #-------------- Cross Compiler  ------------
 # Can be set by board, default to ARM GCC
@@ -45,9 +65,9 @@ endif
 
 #-------------- Source files and compiler flags --------------
 
-# Include all source C in board folder
+# Include all source C in family & board folder
 SRC_C += hw/bsp/board.c
-SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/hw/bsp/$(BOARD)/*.c))
+SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/$(BOARD_PATH)/*.c))
 
 # Compiler Flags
 CFLAGS += \
diff --git a/examples/rules.mk b/examples/rules.mk
index 2274d1cd2..fb1fe76c2 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -11,12 +11,26 @@ ifeq ($(CROSS_COMPILE),xtensa-esp32s2-elf-)
 all:
 	idf.py -B$(BUILD) -DBOARD=$(BOARD) build
 
+build: all
+
 clean:
 	idf.py -B$(BUILD) -DBOARD=$(BOARD) clean
 
 flash:
 	idf.py -B$(BUILD) -DBOARD=$(BOARD) flash
 
+bootloader-flash:
+	idf.py -B$(BUILD) -DBOARD=$(BOARD) bootloader-flash
+
+app-flash:
+	idf.py -B$(BUILD) -DBOARD=$(BOARD) app-flash
+
+erase:
+	idf.py -B$(BUILD) -DBOARD=$(BOARD) erase_flash
+
+monitor:
+	idf.py -B$(BUILD) -DBOARD=$(BOARD) monitor
+
 else
 # GNU Make build system
 
diff --git a/hw/bsp/adafruit_clue/adafruit_clue.c b/hw/bsp/adafruit_clue/adafruit_clue.c
deleted file mode 100644
index cb5c2f223..000000000
--- a/hw/bsp/adafruit_clue/adafruit_clue.c
+++ /dev/null
@@ -1,200 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-#define _PINNUM(port, pin)    ((port)*32 + (pin))
-
-#define LED_PIN         _PINNUM(1, 1)
-#define LED_STATE_ON    1
-
-#define BUTTON_PIN      _PINNUM(1, 02)
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-#endif
-
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active LOW
-  return (nrf_gpio_pin_read(BUTTON_PIN) ? 0 : 1);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/adafruit_clue/board.mk b/hw/bsp/adafruit_clue/board.mk
deleted file mode 100644
index 3db045ac0..000000000
--- a/hw/bsp/adafruit_clue/board.mk
+++ /dev/null
@@ -1,68 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X \
-  -DNRF52840_XXAA \
-  -DCONFIG_GPIO_AS_PINRESET
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/nrf52840_s140_v6.ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-  hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-  hw/mcu/nordic/nrfx/mdk/system_nrf52840.c \
-
-INC += \
-  $(TOP)/lib/CMSIS_4/CMSIS/Include \
-  $(TOP)/hw/mcu/nordic \
-  $(TOP)/hw/mcu/nordic/nrfx \
-  $(TOP)/hw/mcu/nordic/nrfx/mdk \
-  $(TOP)/hw/mcu/nordic/nrfx/hal \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# For uf2 conversion
-UF2_FAMILY = 0xADA52840
-
-$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
-	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
-	
-# flash using adafruit-nrfutil dfu
-flash: $(BUILD)/$(BOARD)-firmware.zip
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/arduino_nano33_ble/arduino_nano33_ble.c b/hw/bsp/arduino_nano33_ble/arduino_nano33_ble.c
deleted file mode 100644
index d2d126311..000000000
--- a/hw/bsp/arduino_nano33_ble/arduino_nano33_ble.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-#include "nrfx/drivers/include/nrfx_uarte.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define _PINNUM(port, pin)    ((port)*32 + (pin))
-
-#define LED_PIN         _PINNUM(0, 24)
-#define LED_STATE_ON    0
-
-#define BUTTON_PIN      _PINNUM(1, 11) // D2
-
-#define UART_RX_PIN     _PINNUM(1, 10)
-#define UART_TX_PIN     _PINNUM(1, 3)
-
-static nrfx_uarte_t _uart_id = NRFX_UARTE_INSTANCE(0);
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // stop LF clock just in case we jump from application without reset
-  NRF_CLOCK->TASKS_LFCLKSTOP = 1UL;
-
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-
-  // UART
-  nrfx_uarte_config_t uart_cfg =
-  {
-    .pseltxd   = UART_TX_PIN,
-    .pselrxd   = UART_RX_PIN,
-    .pselcts   = NRF_UARTE_PSEL_DISCONNECTED,
-    .pselrts   = NRF_UARTE_PSEL_DISCONNECTED,
-    .p_context = NULL,
-    .baudrate  = NRF_UARTE_BAUDRATE_115200, // CFG_BOARD_UART_BAUDRATE
-    .interrupt_priority = 7,
-    .hal_cfg = {
-      .hwfc      = NRF_UARTE_HWFC_DISABLED,
-      .parity    = NRF_UARTE_PARITY_EXCLUDED,
-    }
-  };
-
-  nrfx_uarte_init(&_uart_id, &uart_cfg, NULL); //uart_handler);
-
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active LOW
-  return (nrf_gpio_pin_read(BUTTON_PIN) ? 0 : 1);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-//  return NRFX_SUCCESS == nrfx_uart_rx(&_uart_id, buf, (size_t) len) ? len : 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  return (NRFX_SUCCESS == nrfx_uarte_tx(&_uart_id, (uint8_t const*) buf, (size_t) len)) ? len : 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/arduino_nano33_ble/board.mk b/hw/bsp/arduino_nano33_ble/board.mk
deleted file mode 100644
index 1ee8867e6..000000000
--- a/hw/bsp/arduino_nano33_ble/board.mk
+++ /dev/null
@@ -1,68 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X \
-  -DNRF52840_XXAA \
-  -DCONFIG_GPIO_AS_PINRESET
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-#LD_FILE = hw/bsp/$(BOARD)/linker_script.ld
-LD_FILE = hw/bsp/$(BOARD)/arduino_nano33_ble.ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-  hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-  hw/mcu/nordic/nrfx/drivers/src/nrfx_uarte.c \
-  hw/mcu/nordic/nrfx/mdk/system_nrf52840.c
-
-INC += \
-  $(TOP)/lib/CMSIS_4/CMSIS/Include \
-  $(TOP)/hw/mcu/nordic \
-  $(TOP)/hw/mcu/nordic/nrfx \
-  $(TOP)/hw/mcu/nordic/nrfx/mdk \
-  $(TOP)/hw/mcu/nordic/nrfx/hal \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# flash using bossac (as part of Nano33 BSP tools)
-# can be found in arduino15/packages/arduino/tools/bossac/
-# Add it to your PATH or change BOSSAC variable to match your installation
-BOSSAC = bossac
-
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	$(BOSSAC) --port=$(SERIAL) -U -i -e -w $^ -R
diff --git a/hw/bsp/atsamd21_xpro/atsamd21_xpro.c b/hw/bsp/atsamd21_xpro/atsamd21_xpro.c
deleted file mode 100644
index 26d3e93bd..000000000
--- a/hw/bsp/atsamd21_xpro/atsamd21_xpro.c
+++ /dev/null
@@ -1,140 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-#include "sam.h"
-
-#include "hal/include/hal_gpio.h"
-#include "hal/include/hal_init.h"
-#include "hri/hri_nvmctrl_d21.h"
-
-#include "hpl/gclk/hpl_gclk_base.h"
-#include "hpl_pm_config.h"
-#include "hpl/pm/hpl_pm_base.h"
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-#define LED_PIN      (32+30) // pin PB30
-#define BUTTON_PIN   (0+15) // pin PA15
-
-/* Referenced GCLKs, should be initialized firstly */
-#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
-
-/* Not referenced GCLKs, initialized last */
-#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
-
-void board_init(void)
-{
-  // Clock init ( follow hpl_init.c )
-  hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);
-
-  _pm_init();
-  _sysctrl_init_sources();
-#if _GCLK_INIT_1ST
-  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
-#endif
-  _sysctrl_init_referenced_generators();
-  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
-
-  // Led init
-  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 1);
-
-  // Button init
-  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-  // 1ms tick timer (samd SystemCoreClock may not correct)
-  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
-#endif
-
-  /* USB Clock init
-   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
-   * for low speed and full speed operation. */
-  _pm_enable_bus_clock(PM_BUS_APBB, USB);
-  _pm_enable_bus_clock(PM_BUS_AHB, USB);
-  _gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-
-  // USB Pin Init
-  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA24, false);
-  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
-  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA25, false);
-  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
-
-  gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
-  gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  gpio_set_pin_level(LED_PIN, !state);
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active low
-  return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-//void asf_assert(const bool condition, const char *const file, const int line) {}
-
-void USB_Handler(void)
-{
-  tud_int_handler(0);
-}
diff --git a/hw/bsp/atsamd21_xpro/board.mk b/hw/bsp/atsamd21_xpro/board.mk
deleted file mode 100644
index 733457f6a..000000000
--- a/hw/bsp/atsamd21_xpro/board.mk
+++ /dev/null
@@ -1,45 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs-linux \
-  -mcpu=cortex-m0plus \
-  -nostdlib -nostartfiles \
-  -D__SAMD21J18A__ \
-  -DCONF_DFLL_OVERWRITE_CALIBRATION=0 \
-  -DCFG_TUSB_MCU=OPT_MCU_SAMD21
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/atsamd21_xpro/samd21j18a_flash.ld
-
-SRC_C += \
-  hw/mcu/microchip/asf4/samd21/gcc/gcc/startup_samd21.c \
-  hw/mcu/microchip/asf4/samd21/gcc/system_samd21.c \
-  hw/mcu/microchip/asf4/samd21/hpl/gclk/hpl_gclk.c \
-  hw/mcu/microchip/asf4/samd21/hpl/pm/hpl_pm.c \
-  hw/mcu/microchip/asf4/samd21/hpl/sysctrl/hpl_sysctrl.c \
-  hw/mcu/microchip/asf4/samd21/hal/src/hal_atomic.c
-
-INC += \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/ \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/config \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/include \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hal/include \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hal/utils/include \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hpl/pm/ \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hpl/port \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hri \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/CMSIS/Include
-
-# For TinyUSB port source 
-VENDOR = microchip
-CHIP_FAMILY = samd
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM0
-
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD21J18
-JLINK_IF = swd
-
-# flash using jlink
-flash: flash-jlink
diff --git a/hw/bsp/circuitplayground_bluefruit/board.mk b/hw/bsp/circuitplayground_bluefruit/board.mk
deleted file mode 100644
index 3db045ac0..000000000
--- a/hw/bsp/circuitplayground_bluefruit/board.mk
+++ /dev/null
@@ -1,68 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X \
-  -DNRF52840_XXAA \
-  -DCONFIG_GPIO_AS_PINRESET
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/nrf52840_s140_v6.ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-  hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-  hw/mcu/nordic/nrfx/mdk/system_nrf52840.c \
-
-INC += \
-  $(TOP)/lib/CMSIS_4/CMSIS/Include \
-  $(TOP)/hw/mcu/nordic \
-  $(TOP)/hw/mcu/nordic/nrfx \
-  $(TOP)/hw/mcu/nordic/nrfx/mdk \
-  $(TOP)/hw/mcu/nordic/nrfx/hal \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# For uf2 conversion
-UF2_FAMILY = 0xADA52840
-
-$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
-	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
-	
-# flash using adafruit-nrfutil dfu
-flash: $(BUILD)/$(BOARD)-firmware.zip
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/circuitplayground_bluefruit/circuitplayground_bluefruit.c b/hw/bsp/circuitplayground_bluefruit/circuitplayground_bluefruit.c
deleted file mode 100644
index 9638b3cc8..000000000
--- a/hw/bsp/circuitplayground_bluefruit/circuitplayground_bluefruit.c
+++ /dev/null
@@ -1,200 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define _PINNUM(port, pin)    ((port)*32 + (pin))
-
-#define LED_PIN         _PINNUM(1, 14)
-#define LED_STATE_ON    1
-
-#define BUTTON_PIN      _PINNUM(1, 15)
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLDOWN);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-#endif
-
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active HIGH
-  return nrf_gpio_pin_read(BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/circuitplayground_express/board.mk b/hw/bsp/circuitplayground_express/board.mk
deleted file mode 100644
index 2a36b8335..000000000
--- a/hw/bsp/circuitplayground_express/board.mk
+++ /dev/null
@@ -1,44 +0,0 @@
-CFLAGS += \
-  -DCONF_DFLL_OVERWRITE_CALIBRATION=0 \
-  -D__SAMD21G18A__ \
-  -mthumb \
-  -mabi=aapcs-linux \
-  -mcpu=cortex-m0plus \
-  -nostdlib -nostartfiles \
-  -DCFG_TUSB_MCU=OPT_MCU_SAMD21
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd21g18a_flash.ld
-
-SRC_C += \
-  hw/mcu/microchip/asf4/samd21/gcc/gcc/startup_samd21.c \
-  hw/mcu/microchip/asf4/samd21/gcc/system_samd21.c \
-  hw/mcu/microchip/asf4/samd21/hpl/gclk/hpl_gclk.c \
-  hw/mcu/microchip/asf4/samd21/hpl/pm/hpl_pm.c \
-  hw/mcu/microchip/asf4/samd21/hpl/sysctrl/hpl_sysctrl.c \
-  hw/mcu/microchip/asf4/samd21/hal/src/hal_atomic.c
-
-INC += \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/ \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/config \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/include \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hal/include \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hal/utils/include \
-  $(TOP)/hw/mcu/microchip/asf4/samd51/hpl/pm/ \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hpl/port \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/hri \
-  $(TOP)/hw/mcu/microchip/asf4/samd21/CMSIS/Include
-
-# For TinyUSB port source 
-VENDOR = microchip
-CHIP_FAMILY = samd
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM0
-
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD21G18
-
-# flash using jlink
-flash: $(BUILD)/$(BOARD)-firmware.uf2
-	cp $< /media/$(USER)/CPLAYBOOT/
diff --git a/hw/bsp/circuitplayground_express/circuitplayground_express.c b/hw/bsp/circuitplayground_express/circuitplayground_express.c
deleted file mode 100644
index 4ff95b2ff..000000000
--- a/hw/bsp/circuitplayground_express/circuitplayground_express.c
+++ /dev/null
@@ -1,157 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "sam.h"
-#include "bsp/board.h"
-
-#include "hal/include/hal_gpio.h"
-#include "hal/include/hal_init.h"
-#include "hri/hri_nvmctrl_d21.h"
-
-#include "hpl/gclk/hpl_gclk_base.h"
-#include "hpl_pm_config.h"
-#include "hpl/pm/hpl_pm_base.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USB_Handler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-#define LED_PIN      17
-#define BUTTON_PIN   14 // pin D5
-
-/* Referenced GCLKs, should be initialized firstly */
-#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
-
-/* Not referenced GCLKs, initialized last */
-#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
-
-void board_init(void)
-{
-  // Clock init ( follow hpl_init.c )
-  hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);
-
-  _pm_init();
-  _sysctrl_init_sources();
-#if _GCLK_INIT_1ST
-  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
-#endif
-  _sysctrl_init_referenced_generators();
-  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
-
-  // Update SystemCoreClock since it is hard coded with asf4 and not correct
-  // Init 1ms tick timer (samd SystemCoreClock may not correct)
-  SystemCoreClock = CONF_CPU_FREQUENCY;
-  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
-
-  // Led init
-  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 0);
-
-  // Button init
-  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_DOWN);
-
-#if CFG_TUSB_OS  == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  NVIC_SetPriority(USB_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-#endif
-
-  /* USB Clock init
-   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
-   * for low speed and full speed operation. */
-  _pm_enable_bus_clock(PM_BUS_APBB, USB);
-  _pm_enable_bus_clock(PM_BUS_AHB, USB);
-  _gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-
-  // USB Pin Init
-  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA24, false);
-  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
-  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA25, false);
-  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
-
-  gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
-  gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
-
-  // Output 500hz PWM on D12 (PA19 - TCC0 WO[3]) so we can validate the GCLK0 clock speed with a Saleae.
-  _pm_enable_bus_clock(PM_BUS_APBC, TCC0);
-  TCC0->PER.bit.PER = 48000000 / 1000;
-  TCC0->CC[3].bit.CC = 48000000 / 2000;
-  TCC0->CTRLA.bit.ENABLE = true;
-
-  gpio_set_pin_function(PIN_PA19, PINMUX_PA19F_TCC0_WO3);
-  _gclk_enable_channel(TCC0_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  gpio_set_pin_level(LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active high
-  return gpio_get_pin_level(BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-
-#endif
diff --git a/hw/bsp/esp32s2_saola_1/CMakeLists.txt b/hw/bsp/esp32s2/boards/CMakeLists.txt
similarity index 67%
rename from hw/bsp/esp32s2_saola_1/CMakeLists.txt
rename to hw/bsp/esp32s2/boards/CMakeLists.txt
index 629b3104a..98c929ef3 100644
--- a/hw/bsp/esp32s2_saola_1/CMakeLists.txt
+++ b/hw/bsp/esp32s2/boards/CMakeLists.txt
@@ -1,7 +1,7 @@
-idf_component_register(SRCS "${BOARD}.c" "led_strip/src/led_strip_rmt_ws2812.c"
-                    INCLUDE_DIRS "led_strip/include"
+idf_component_register(SRCS esp32s2.c
+                    INCLUDE_DIRS "." "${BOARD}"
                     PRIV_REQUIRES "driver"
-                    REQUIRES freertos src)
+                    REQUIRES freertos src led_strip)
 
 target_compile_options(${COMPONENT_TARGET} PUBLIC
   "-DCFG_TUSB_MCU=OPT_MCU_ESP32S2"
diff --git a/hw/bsp/esp32s2_kaluga_1/esp32s2_kaluga_1.c b/hw/bsp/esp32s2/boards/esp32s2.c
similarity index 94%
rename from hw/bsp/esp32s2_kaluga_1/esp32s2_kaluga_1.c
rename to hw/bsp/esp32s2/boards/esp32s2.c
index 47f9c2d47..abed39e49 100644
--- a/hw/bsp/esp32s2_kaluga_1/esp32s2_kaluga_1.c
+++ b/hw/bsp/esp32s2/boards/esp32s2.c
@@ -24,23 +24,22 @@
  * This file is part of the TinyUSB stack.
  */
 
-#include "../board.h"
+#include "../../board.h"
+#include "board.h"
+
 #include "esp_rom_gpio.h"
 #include "hal/gpio_ll.h"
 #include "hal/usb_hal.h"
 #include "soc/usb_periph.h"
+
 #include "driver/periph_ctrl.h"
 #include "driver/rmt.h"
-#include "led_strip/include/led_strip.h"
+#include "led_strip.h"
 
 //--------------------------------------------------------------------+
 // MACRO TYPEDEF CONSTANT ENUM DECLARATION
 //--------------------------------------------------------------------+
 
-#define LED_PIN               45
-#define BUTTON_PIN            0
-#define BUTTON_STATE_ACTIVE   0
-
 static void configure_pins(usb_hal_context_t *usb);
 static led_strip_t *strip;
 
@@ -48,7 +47,7 @@ static led_strip_t *strip;
 void board_init(void)
 {
   // WS2812 Neopixel driver with RMT peripheral
-  rmt_config_t config = RMT_DEFAULT_CONFIG_TX(LED_PIN, RMT_CHANNEL_0);
+  rmt_config_t config = RMT_DEFAULT_CONFIG_TX(NEOPIXEL_PIN, RMT_CHANNEL_0);
   config.clk_div = 2; // set counter clock to 40MHz
 
   rmt_config(&config);
diff --git a/hw/bsp/teensy_40/board.h b/hw/bsp/esp32s2/boards/esp32s2_kaluga_1/board.h
similarity index 82%
rename from hw/bsp/teensy_40/board.h
rename to hw/bsp/esp32s2/boards/esp32s2_kaluga_1/board.h
index c5338e274..6bb44f76d 100644
--- a/hw/bsp/teensy_40/board.h
+++ b/hw/bsp/esp32s2/boards/esp32s2_kaluga_1/board.h
@@ -1,7 +1,7 @@
 /* 
  * The MIT License (MIT)
  *
- * Copyright (c) 2019, Ha Thach (tinyusb.org)
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,13 +24,21 @@
  * This file is part of the TinyUSB stack.
  */
 
-
 #ifndef BOARD_H_
 #define BOARD_H_
 
+#ifdef __cplusplus
+ extern "C" {
+#endif
 
-// required since iMX RT10xx SDK include this file for board size
-#define BOARD_FLASH_SIZE (2 * 1024 * 1024)
+// Note: need to insert jumper next to WS2812 pixel
+#define NEOPIXEL_PIN          45
 
+#define BUTTON_PIN            0
+#define BUTTON_STATE_ACTIVE   0
+
+#ifdef __cplusplus
+ }
+#endif
 
 #endif /* BOARD_H_ */
diff --git a/hw/bsp/esp32s2/boards/esp32s2_saola_1/board.h b/hw/bsp/esp32s2/boards/esp32s2_saola_1/board.h
new file mode 100644
index 000000000..f450b9a8b
--- /dev/null
+++ b/hw/bsp/esp32s2/boards/esp32s2_saola_1/board.h
@@ -0,0 +1,45 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// Note: On the production version (v1.2) WS2812 is connected to GPIO 18,
+// however earlier revision v1.1 WS2812 is connected to GPIO 17
+#define NEOPIXEL_PIN          18
+
+#define BUTTON_PIN            0
+#define BUTTON_STATE_ACTIVE   0
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/esp32s2/components/led_strip/CMakeLists.txt b/hw/bsp/esp32s2/components/led_strip/CMakeLists.txt
new file mode 100644
index 000000000..6d0fcbc86
--- /dev/null
+++ b/hw/bsp/esp32s2/components/led_strip/CMakeLists.txt
@@ -0,0 +1,8 @@
+set(component_srcs "src/led_strip_rmt_ws2812.c")
+
+idf_component_register(SRCS "${component_srcs}"
+                       INCLUDE_DIRS "include"
+                       PRIV_INCLUDE_DIRS ""
+                       PRIV_REQUIRES "driver"
+                       REQUIRES "")
+
diff --git a/hw/bsp/esp32s2_kaluga_1/led_strip/include/led_strip.h b/hw/bsp/esp32s2/components/led_strip/include/led_strip.h
similarity index 100%
rename from hw/bsp/esp32s2_kaluga_1/led_strip/include/led_strip.h
rename to hw/bsp/esp32s2/components/led_strip/include/led_strip.h
diff --git a/hw/bsp/esp32s2_kaluga_1/led_strip/src/led_strip_rmt_ws2812.c b/hw/bsp/esp32s2/components/led_strip/src/led_strip_rmt_ws2812.c
similarity index 100%
rename from hw/bsp/esp32s2_kaluga_1/led_strip/src/led_strip_rmt_ws2812.c
rename to hw/bsp/esp32s2/components/led_strip/src/led_strip_rmt_ws2812.c
diff --git a/hw/bsp/esp32s2_kaluga_1/board.mk b/hw/bsp/esp32s2/family.mk
similarity index 100%
rename from hw/bsp/esp32s2_kaluga_1/board.mk
rename to hw/bsp/esp32s2/family.mk
diff --git a/hw/bsp/esp32s2_kaluga_1/CMakeLists.txt b/hw/bsp/esp32s2_kaluga_1/CMakeLists.txt
deleted file mode 100644
index 1627f39a3..000000000
--- a/hw/bsp/esp32s2_kaluga_1/CMakeLists.txt
+++ /dev/null
@@ -1,16 +0,0 @@
-idf_component_register(SRCS "${BOARD}.c" "led_strip/src/led_strip_rmt_ws2812.c"
-                    INCLUDE_DIRS "led_strip/include"
-                    PRIV_REQUIRES "driver"
-                    REQUIRES freertos src)
-
-target_compile_options(${COMPONENT_TARGET} PUBLIC
-  "-DCFG_TUSB_MCU=OPT_MCU_ESP32S2"
-  "-DCFG_TUSB_OS=OPT_OS_FREERTOS"
-)
-
-idf_component_get_property( FREERTOS_ORIG_INCLUDE_PATH freertos ORIG_INCLUDE_PATH)
-target_include_directories(${COMPONENT_TARGET} PUBLIC
-  "${FREERTOS_ORIG_INCLUDE_PATH}"
-  "${TOP}/hw"
-  "${TOP}/src"
-)
diff --git a/hw/bsp/esp32s2_saola_1/board.mk b/hw/bsp/esp32s2_saola_1/board.mk
deleted file mode 100644
index 167ef6226..000000000
--- a/hw/bsp/esp32s2_saola_1/board.mk
+++ /dev/null
@@ -1,2 +0,0 @@
-# Cross Compiler for ESP32
-CROSS_COMPILE = xtensa-esp32s2-elf-
diff --git a/hw/bsp/esp32s2_saola_1/esp32s2_saola_1.c b/hw/bsp/esp32s2_saola_1/esp32s2_saola_1.c
deleted file mode 100644
index 5795c4b68..000000000
--- a/hw/bsp/esp32s2_saola_1/esp32s2_saola_1.c
+++ /dev/null
@@ -1,134 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2020, Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-#include "esp_rom_gpio.h"
-#include "hal/gpio_ll.h"
-#include "hal/usb_hal.h"
-#include "soc/usb_periph.h"
-
-#include "driver/periph_ctrl.h"
-#include "driver/rmt.h"
-#include "led_strip/include/led_strip.h"
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-
-// Note: On the production version (v1.2) WS2812 is connected to GPIO 18,
-// however earlier revision v1.1 WS2812 is connected to GPIO 17
-//#define LED_PIN               17 // v1.1
-#define LED_PIN               18 // v1.2 and later
-#define BUTTON_PIN            0
-#define BUTTON_STATE_ACTIVE   0
-
-static void configure_pins(usb_hal_context_t *usb);
-static led_strip_t *strip;
-
-// Initialize on-board peripherals : led, button, uart and USB
-void board_init(void)
-{
-  // WS2812 Neopixel driver with RMT peripheral
-  rmt_config_t config = RMT_DEFAULT_CONFIG_TX(LED_PIN, RMT_CHANNEL_0);
-  config.clk_div = 2; // set counter clock to 40MHz
-
-  rmt_config(&config);
-  rmt_driver_install(config.channel, 0, 0);
-
-  led_strip_config_t strip_config = LED_STRIP_DEFAULT_CONFIG(1, (led_strip_dev_t) config.channel);
-  strip = led_strip_new_rmt_ws2812(&strip_config);
-  strip->clear(strip, 100); // off led
-
-  // Button
-  gpio_pad_select_gpio(BUTTON_PIN);
-  gpio_set_direction(BUTTON_PIN, GPIO_MODE_INPUT);
-  gpio_set_pull_mode(BUTTON_PIN, BUTTON_STATE_ACTIVE ? GPIO_PULLDOWN_ONLY : GPIO_PULLUP_ONLY);
-
-  // USB Controller Hal init
-  periph_module_reset(PERIPH_USB_MODULE);
-  periph_module_enable(PERIPH_USB_MODULE);
-
-  usb_hal_context_t hal = {
-    .use_external_phy = false // use built-in PHY
-  };
-  usb_hal_init(&hal);
-  configure_pins(&hal);
-}
-
-static void configure_pins(usb_hal_context_t *usb)
-{
-  /* usb_periph_iopins currently configures USB_OTG as USB Device.
-   * Introduce additional parameters in usb_hal_context_t when adding support
-   * for USB Host.
-   */
-  for (const usb_iopin_dsc_t *iopin = usb_periph_iopins; iopin->pin != -1; ++iopin) {
-    if ((usb->use_external_phy) || (iopin->ext_phy_only == 0)) {
-      esp_rom_gpio_pad_select_gpio(iopin->pin);
-      if (iopin->is_output) {
-        esp_rom_gpio_connect_out_signal(iopin->pin, iopin->func, false, false);
-      } else {
-        esp_rom_gpio_connect_in_signal(iopin->pin, iopin->func, false);
-        if ((iopin->pin != GPIO_FUNC_IN_LOW) && (iopin->pin != GPIO_FUNC_IN_HIGH)) {
-          gpio_ll_input_enable(&GPIO, iopin->pin);
-        }
-      }
-      esp_rom_gpio_pad_unhold(iopin->pin);
-    }
-  }
-  if (!usb->use_external_phy) {
-    gpio_set_drive_capability(USBPHY_DM_NUM, GPIO_DRIVE_CAP_3);
-    gpio_set_drive_capability(USBPHY_DP_NUM, GPIO_DRIVE_CAP_3);
-  }
-}
-
-// Turn LED on or off
-void board_led_write(bool state)
-{
-  strip->set_pixel(strip, 0, (state ? 0x88 : 0x00), 0x00, 0x00);
-  strip->refresh(strip, 100);
-}
-
-// Get the current state of button
-// a '1' means active (pressed), a '0' means inactive.
-uint32_t board_button_read(void)
-{
-  return gpio_get_level(BUTTON_PIN) == BUTTON_STATE_ACTIVE;
-}
-
-// Get characters from UART
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-// Send characters to UART
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
diff --git a/hw/bsp/esp32s2_saola_1/led_strip/include/led_strip.h b/hw/bsp/esp32s2_saola_1/led_strip/include/led_strip.h
deleted file mode 100644
index a9dffc325..000000000
--- a/hw/bsp/esp32s2_saola_1/led_strip/include/led_strip.h
+++ /dev/null
@@ -1,126 +0,0 @@
-// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-#pragma once
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include "esp_err.h"
-
-/**
-* @brief LED Strip Type
-*
-*/
-typedef struct led_strip_s led_strip_t;
-
-/**
-* @brief LED Strip Device Type
-*
-*/
-typedef void *led_strip_dev_t;
-
-/**
-* @brief Declare of LED Strip Type
-*
-*/
-struct led_strip_s {
-    /**
-    * @brief Set RGB for a specific pixel
-    *
-    * @param strip: LED strip
-    * @param index: index of pixel to set
-    * @param red: red part of color
-    * @param green: green part of color
-    * @param blue: blue part of color
-    *
-    * @return
-    *      - ESP_OK: Set RGB for a specific pixel successfully
-    *      - ESP_ERR_INVALID_ARG: Set RGB for a specific pixel failed because of invalid parameters
-    *      - ESP_FAIL: Set RGB for a specific pixel failed because other error occurred
-    */
-    esp_err_t (*set_pixel)(led_strip_t *strip, uint32_t index, uint32_t red, uint32_t green, uint32_t blue);
-
-    /**
-    * @brief Refresh memory colors to LEDs
-    *
-    * @param strip: LED strip
-    * @param timeout_ms: timeout value for refreshing task
-    *
-    * @return
-    *      - ESP_OK: Refresh successfully
-    *      - ESP_ERR_TIMEOUT: Refresh failed because of timeout
-    *      - ESP_FAIL: Refresh failed because some other error occurred
-    *
-    * @note:
-    *      After updating the LED colors in the memory, a following invocation of this API is needed to flush colors to strip.
-    */
-    esp_err_t (*refresh)(led_strip_t *strip, uint32_t timeout_ms);
-
-    /**
-    * @brief Clear LED strip (turn off all LEDs)
-    *
-    * @param strip: LED strip
-    * @param timeout_ms: timeout value for clearing task
-    *
-    * @return
-    *      - ESP_OK: Clear LEDs successfully
-    *      - ESP_ERR_TIMEOUT: Clear LEDs failed because of timeout
-    *      - ESP_FAIL: Clear LEDs failed because some other error occurred
-    */
-    esp_err_t (*clear)(led_strip_t *strip, uint32_t timeout_ms);
-
-    /**
-    * @brief Free LED strip resources
-    *
-    * @param strip: LED strip
-    *
-    * @return
-    *      - ESP_OK: Free resources successfully
-    *      - ESP_FAIL: Free resources failed because error occurred
-    */
-    esp_err_t (*del)(led_strip_t *strip);
-};
-
-/**
-* @brief LED Strip Configuration Type
-*
-*/
-typedef struct {
-    uint32_t max_leds;   /*!< Maximum LEDs in a single strip */
-    led_strip_dev_t dev; /*!< LED strip device (e.g. RMT channel, PWM channel, etc) */
-} led_strip_config_t;
-
-/**
- * @brief Default configuration for LED strip
- *
- */
-#define LED_STRIP_DEFAULT_CONFIG(number, dev_hdl) \
-    {                                             \
-        .max_leds = number,                       \
-        .dev = dev_hdl,                           \
-    }
-
-/**
-* @brief Install a new ws2812 driver (based on RMT peripheral)
-*
-* @param config: LED strip configuration
-* @return
-*      LED strip instance or NULL
-*/
-led_strip_t *led_strip_new_rmt_ws2812(const led_strip_config_t *config);
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/hw/bsp/esp32s2_saola_1/led_strip/src/led_strip_rmt_ws2812.c b/hw/bsp/esp32s2_saola_1/led_strip/src/led_strip_rmt_ws2812.c
deleted file mode 100644
index 025d3c590..000000000
--- a/hw/bsp/esp32s2_saola_1/led_strip/src/led_strip_rmt_ws2812.c
+++ /dev/null
@@ -1,171 +0,0 @@
-// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-#include <stdlib.h>
-#include <string.h>
-#include <sys/cdefs.h>
-#include "esp_log.h"
-#include "esp_attr.h"
-#include "led_strip.h"
-#include "driver/rmt.h"
-
-static const char *TAG = "ws2812";
-#define STRIP_CHECK(a, str, goto_tag, ret_value, ...)                             \
-    do                                                                            \
-    {                                                                             \
-        if (!(a))                                                                 \
-        {                                                                         \
-            ESP_LOGE(TAG, "%s(%d): " str, __FUNCTION__, __LINE__, ##__VA_ARGS__); \
-            ret = ret_value;                                                      \
-            goto goto_tag;                                                        \
-        }                                                                         \
-    } while (0)
-
-#define WS2812_T0H_NS (350)
-#define WS2812_T0L_NS (1000)
-#define WS2812_T1H_NS (1000)
-#define WS2812_T1L_NS (350)
-#define WS2812_RESET_US (280)
-
-static uint32_t ws2812_t0h_ticks = 0;
-static uint32_t ws2812_t1h_ticks = 0;
-static uint32_t ws2812_t0l_ticks = 0;
-static uint32_t ws2812_t1l_ticks = 0;
-
-typedef struct {
-    led_strip_t parent;
-    rmt_channel_t rmt_channel;
-    uint32_t strip_len;
-    uint8_t buffer[0];
-} ws2812_t;
-
-/**
- * @brief Conver RGB data to RMT format.
- *
- * @note For WS2812, R,G,B each contains 256 different choices (i.e. uint8_t)
- *
- * @param[in] src: source data, to converted to RMT format
- * @param[in] dest: place where to store the convert result
- * @param[in] src_size: size of source data
- * @param[in] wanted_num: number of RMT items that want to get
- * @param[out] translated_size: number of source data that got converted
- * @param[out] item_num: number of RMT items which are converted from source data
- */
-static void IRAM_ATTR ws2812_rmt_adapter(const void *src, rmt_item32_t *dest, size_t src_size,
-        size_t wanted_num, size_t *translated_size, size_t *item_num)
-{
-    if (src == NULL || dest == NULL) {
-        *translated_size = 0;
-        *item_num = 0;
-        return;
-    }
-    const rmt_item32_t bit0 = {{{ ws2812_t0h_ticks, 1, ws2812_t0l_ticks, 0 }}}; //Logical 0
-    const rmt_item32_t bit1 = {{{ ws2812_t1h_ticks, 1, ws2812_t1l_ticks, 0 }}}; //Logical 1
-    size_t size = 0;
-    size_t num = 0;
-    uint8_t *psrc = (uint8_t *)src;
-    rmt_item32_t *pdest = dest;
-    while (size < src_size && num < wanted_num) {
-        for (int i = 0; i < 8; i++) {
-            // MSB first
-            if (*psrc & (1 << (7 - i))) {
-                pdest->val =  bit1.val;
-            } else {
-                pdest->val =  bit0.val;
-            }
-            num++;
-            pdest++;
-        }
-        size++;
-        psrc++;
-    }
-    *translated_size = size;
-    *item_num = num;
-}
-
-static esp_err_t ws2812_set_pixel(led_strip_t *strip, uint32_t index, uint32_t red, uint32_t green, uint32_t blue)
-{
-    esp_err_t ret = ESP_OK;
-    ws2812_t *ws2812 = __containerof(strip, ws2812_t, parent);
-    STRIP_CHECK(index < ws2812->strip_len, "index out of the maximum number of leds", err, ESP_ERR_INVALID_ARG);
-    uint32_t start = index * 3;
-    // In thr order of GRB
-    ws2812->buffer[start + 0] = green & 0xFF;
-    ws2812->buffer[start + 1] = red & 0xFF;
-    ws2812->buffer[start + 2] = blue & 0xFF;
-    return ESP_OK;
-err:
-    return ret;
-}
-
-static esp_err_t ws2812_refresh(led_strip_t *strip, uint32_t timeout_ms)
-{
-    esp_err_t ret = ESP_OK;
-    ws2812_t *ws2812 = __containerof(strip, ws2812_t, parent);
-    STRIP_CHECK(rmt_write_sample(ws2812->rmt_channel, ws2812->buffer, ws2812->strip_len * 3, true) == ESP_OK,
-                "transmit RMT samples failed", err, ESP_FAIL);
-    return rmt_wait_tx_done(ws2812->rmt_channel, pdMS_TO_TICKS(timeout_ms));
-err:
-    return ret;
-}
-
-static esp_err_t ws2812_clear(led_strip_t *strip, uint32_t timeout_ms)
-{
-    ws2812_t *ws2812 = __containerof(strip, ws2812_t, parent);
-    // Write zero to turn off all leds
-    memset(ws2812->buffer, 0, ws2812->strip_len * 3);
-    return ws2812_refresh(strip, timeout_ms);
-}
-
-static esp_err_t ws2812_del(led_strip_t *strip)
-{
-    ws2812_t *ws2812 = __containerof(strip, ws2812_t, parent);
-    free(ws2812);
-    return ESP_OK;
-}
-
-led_strip_t *led_strip_new_rmt_ws2812(const led_strip_config_t *config)
-{
-    led_strip_t *ret = NULL;
-    STRIP_CHECK(config, "configuration can't be null", err, NULL);
-
-    // 24 bits per led
-    uint32_t ws2812_size = sizeof(ws2812_t) + config->max_leds * 3;
-    ws2812_t *ws2812 = calloc(1, ws2812_size);
-    STRIP_CHECK(ws2812, "request memory for ws2812 failed", err, NULL);
-
-    uint32_t counter_clk_hz = 0;
-    STRIP_CHECK(rmt_get_counter_clock((rmt_channel_t)config->dev, &counter_clk_hz) == ESP_OK,
-                "get rmt counter clock failed", err, NULL);
-    // ns -> ticks
-    float ratio = (float)counter_clk_hz / 1e9;
-    ws2812_t0h_ticks = (uint32_t)(ratio * WS2812_T0H_NS);
-    ws2812_t0l_ticks = (uint32_t)(ratio * WS2812_T0L_NS);
-    ws2812_t1h_ticks = (uint32_t)(ratio * WS2812_T1H_NS);
-    ws2812_t1l_ticks = (uint32_t)(ratio * WS2812_T1L_NS);
-
-    // set ws2812 to rmt adapter
-    rmt_translator_init((rmt_channel_t)config->dev, ws2812_rmt_adapter);
-
-    ws2812->rmt_channel = (rmt_channel_t)config->dev;
-    ws2812->strip_len = config->max_leds;
-
-    ws2812->parent.set_pixel = ws2812_set_pixel;
-    ws2812->parent.refresh = ws2812_refresh;
-    ws2812->parent.clear = ws2812_clear;
-    ws2812->parent.del = ws2812_del;
-
-    return &ws2812->parent;
-err:
-    return ret;
-}
diff --git a/hw/bsp/feather_m0_express/board.mk b/hw/bsp/feather_m0_express/board.mk
deleted file mode 100644
index 61dc7c665..000000000
--- a/hw/bsp/feather_m0_express/board.mk
+++ /dev/null
@@ -1,50 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs-linux \
-  -mcpu=cortex-m0plus \
-  -nostdlib -nostartfiles \
-  -D__SAMD21G18A__ \
-  -DCONF_DFLL_OVERWRITE_CALIBRATION=0 \
-  -DCFG_TUSB_MCU=OPT_MCU_SAMD21
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd21g18a_flash.ld
-
-SRC_C += \
-	hw/mcu/microchip/asf4/samd21/gcc/gcc/startup_samd21.c \
-	hw/mcu/microchip/asf4/samd21/gcc/system_samd21.c \
-	hw/mcu/microchip/asf4/samd21/hpl/gclk/hpl_gclk.c \
-	hw/mcu/microchip/asf4/samd21/hpl/pm/hpl_pm.c \
-	hw/mcu/microchip/asf4/samd21/hpl/sysctrl/hpl_sysctrl.c \
-	hw/mcu/microchip/asf4/samd21/hal/src/hal_atomic.c
-
-INC += \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/config \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hal/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hal/utils/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hpl/pm/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hpl/port \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hri \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/CMSIS/Include
-
-# For TinyUSB port source 
-VENDOR = microchip
-CHIP_FAMILY = samd
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM0
-
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD21G18
-
-# flash using bossac at least version 1.8
-# can be found in arduino15/packages/arduino/tools/bossac/
-# Add it to your PATH or change BOSSAC variable to match your installation
-BOSSAC = bossac
-
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	$(BOSSAC) --port=$(SERIAL) -U -i --offset=0x2000 -e -w $^ -R
diff --git a/hw/bsp/feather_m0_express/feather_m0_express.c b/hw/bsp/feather_m0_express/feather_m0_express.c
deleted file mode 100644
index 4eb157c8f..000000000
--- a/hw/bsp/feather_m0_express/feather_m0_express.c
+++ /dev/null
@@ -1,155 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "sam.h"
-#include "bsp/board.h"
-
-#include "hal/include/hal_gpio.h"
-#include "hal/include/hal_init.h"
-#include "hri/hri_nvmctrl_d21.h"
-
-#include "hpl/gclk/hpl_gclk_base.h"
-#include "hpl_pm_config.h"
-#include "hpl/pm/hpl_pm_base.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USB_Handler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-#define LED_PIN      17
-#define BUTTON_PIN   15 // pin D5
-
-/* Referenced GCLKs, should be initialized firstly */
-#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
-
-/* Not referenced GCLKs, initialized last */
-#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
-
-void board_init(void)
-{
-  // Clock init ( follow hpl_init.c )
-  hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);
-
-  _pm_init();
-  _sysctrl_init_sources();
-#if _GCLK_INIT_1ST
-  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
-#endif
-  _sysctrl_init_referenced_generators();
-  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
-
-  // Update SystemCoreClock since it is hard coded with asf4 and not correct
-  // Init 1ms tick timer (samd SystemCoreClock may not correct)
-  SystemCoreClock = CONF_CPU_FREQUENCY;
-  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
-
-  // Led init
-  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 0);
-
-  // Button init
-  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
-
-#if CFG_TUSB_OS  == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  NVIC_SetPriority(USB_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-#endif
-
-  /* USB Clock init
-   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
-   * for low speed and full speed operation. */
-  _pm_enable_bus_clock(PM_BUS_APBB, USB);
-  _pm_enable_bus_clock(PM_BUS_AHB, USB);
-  _gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-
-  // USB Pin Init
-  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA24, false);
-  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
-  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA25, false);
-  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
-
-  gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
-  gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
-
-  // Output 500hz PWM on D12 (PA19 - TCC0 WO[3]) so we can validate the GCLK0 clock speed with a Saleae.
-  _pm_enable_bus_clock(PM_BUS_APBC, TCC0);
-  TCC0->PER.bit.PER = 48000000 / 1000;
-  TCC0->CC[3].bit.CC = 48000000 / 2000;
-  TCC0->CTRLA.bit.ENABLE = true;
-
-  gpio_set_pin_function(PIN_PA19, PINMUX_PA19F_TCC0_WO3);
-  _gclk_enable_channel(TCC0_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  gpio_set_pin_level(LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active low
-  return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/feather_m4_express/board.mk b/hw/bsp/feather_m4_express/board.mk
deleted file mode 100644
index 6cc6a9091..000000000
--- a/hw/bsp/feather_m4_express/board.mk
+++ /dev/null
@@ -1,53 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs-linux \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -D__SAMD51J19A__ \
-  -DCFG_TUSB_MCU=OPT_MCU_SAMD51
-
-CFLAGS += -Wno-error=undef
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd51g19a_flash.ld
-
-SRC_C += \
-	hw/mcu/microchip/asf4/samd51/gcc/gcc/startup_samd51.c \
-	hw/mcu/microchip/asf4/samd51/gcc/system_samd51.c \
-	hw/mcu/microchip/asf4/samd51/hpl/gclk/hpl_gclk.c \
-	hw/mcu/microchip/asf4/samd51/hpl/mclk/hpl_mclk.c \
-	hw/mcu/microchip/asf4/samd51/hpl/osc32kctrl/hpl_osc32kctrl.c \
-	hw/mcu/microchip/asf4/samd51/hpl/oscctrl/hpl_oscctrl.c \
-	hw/mcu/microchip/asf4/samd51/hal/src/hal_atomic.c
-
-INC += \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/config \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/hal/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/hal/utils/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/hpl/port \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/hri \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/CMSIS/Include
-
-# For TinyUSB port source
-VENDOR = microchip
-CHIP_FAMILY = samd
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD51J19
-
-# flash using bossac at least version 1.8
-# can be found in arduino15/packages/arduino/tools/bossac/
-# Add it to your PATH or change BOSSAC variable to match your installation
-BOSSAC = bossac
-
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	$(BOSSAC) --port=$(SERIAL) -U -i --offset=0x4000 -e -w $^ -R
diff --git a/hw/bsp/feather_nrf52840_express/feather_nrf52840_express.c b/hw/bsp/feather_nrf52840_express/feather_nrf52840_express.c
deleted file mode 100644
index 34e7fa8ec..000000000
--- a/hw/bsp/feather_nrf52840_express/feather_nrf52840_express.c
+++ /dev/null
@@ -1,225 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-#include "nrfx/drivers/include/nrfx_uarte.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define _PINNUM(port, pin)    ((port)*32 + (pin))
-
-#define LED_PIN         _PINNUM(1, 15)
-#define LED_STATE_ON    1
-
-#define BUTTON_PIN      _PINNUM(1, 02)
-
-#define UART_RX_PIN     24
-#define UART_TX_PIN     25
-
-static nrfx_uarte_t _uart_id = NRFX_UARTE_INSTANCE(0);
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // stop LF clock just in case we jump from application without reset
-  NRF_CLOCK->TASKS_LFCLKSTOP = 1UL;
-
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-
-  // UART
-  nrfx_uarte_config_t uart_cfg =
-  {
-    .pseltxd   = UART_TX_PIN,
-    .pselrxd   = UART_RX_PIN,
-    .pselcts   = NRF_UARTE_PSEL_DISCONNECTED,
-    .pselrts   = NRF_UARTE_PSEL_DISCONNECTED,
-    .p_context = NULL,
-    .baudrate  = NRF_UARTE_BAUDRATE_115200, // CFG_BOARD_UART_BAUDRATE
-    .interrupt_priority = 7,
-    .hal_cfg = {
-      .hwfc      = NRF_UARTE_HWFC_DISABLED,
-      .parity    = NRF_UARTE_PARITY_EXCLUDED,
-    }
-  };
-
-  nrfx_uarte_init(&_uart_id, &uart_cfg, NULL); //uart_handler);
-
-  //------------- USB -------------//
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active LOW
-  return (nrf_gpio_pin_read(BUTTON_PIN) ? 0 : 1);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-//  return NRFX_SUCCESS == nrfx_uart_rx(&_uart_id, buf, (size_t) len) ? len : 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  return (NRFX_SUCCESS == nrfx_uarte_tx(&_uart_id, (uint8_t const*) buf, (size_t) len)) ? len : 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/feather_nrf52840_sense/board.mk b/hw/bsp/feather_nrf52840_sense/board.mk
deleted file mode 100644
index 3db045ac0..000000000
--- a/hw/bsp/feather_nrf52840_sense/board.mk
+++ /dev/null
@@ -1,68 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X \
-  -DNRF52840_XXAA \
-  -DCONFIG_GPIO_AS_PINRESET
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/nrf52840_s140_v6.ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-  hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-  hw/mcu/nordic/nrfx/mdk/system_nrf52840.c \
-
-INC += \
-  $(TOP)/lib/CMSIS_4/CMSIS/Include \
-  $(TOP)/hw/mcu/nordic \
-  $(TOP)/hw/mcu/nordic/nrfx \
-  $(TOP)/hw/mcu/nordic/nrfx/mdk \
-  $(TOP)/hw/mcu/nordic/nrfx/hal \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# For uf2 conversion
-UF2_FAMILY = 0xADA52840
-
-$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
-	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
-	
-# flash using adafruit-nrfutil dfu
-flash: $(BUILD)/$(BOARD)-firmware.zip
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/feather_nrf52840_sense/feather_nrf52840_sense.c b/hw/bsp/feather_nrf52840_sense/feather_nrf52840_sense.c
deleted file mode 100644
index 284ae27b1..000000000
--- a/hw/bsp/feather_nrf52840_sense/feather_nrf52840_sense.c
+++ /dev/null
@@ -1,197 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define _PINNUM(port, pin)    ((port)*32 + (pin))
-
-#define LED_PIN         _PINNUM(1, 9)
-#define LED_STATE_ON    1
-
-#define BUTTON_PIN      _PINNUM(1, 02)
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active LOW
-  return (nrf_gpio_pin_read(BUTTON_PIN) ? 0 : 1);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/feather_stm32f405/board.mk b/hw/bsp/feather_stm32f405/board.mk
deleted file mode 100644
index 3a2134875..000000000
--- a/hw/bsp/feather_stm32f405/board.mk
+++ /dev/null
@@ -1,54 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F405xx \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F4
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-align
-
-ST_FAMILY = f4
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F405RGTx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = stm32f405rg
-
-# Path to STM32 Cube Programmer CLI, should be added into system path
-STM32Prog = STM32_Programmer_CLI
-
-# flash target ROM bootloader
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<
diff --git a/hw/bsp/feather_stm32f405/feather_stm32f405.c b/hw/bsp/feather_stm32f405/feather_stm32f405.c
deleted file mode 100644
index a8c782da5..000000000
--- a/hw/bsp/feather_stm32f405/feather_stm32f405.c
+++ /dev/null
@@ -1,249 +0,0 @@
-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f4xx.h"
-#include "stm32f4xx_hal_conf.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-// Blue LED is chosen because the other LEDs are connected to ST-LINK lines.
-#define LED_PORT              GPIOC
-#define LED_PIN               GPIO_PIN_1
-#define LED_STATE_ON          1
-
-// Pin D5
-#define BUTTON_PORT           GPIOC
-#define BUTTON_PIN            GPIO_PIN_7
-#define BUTTON_STATE_ACTIVE   0
-
-#define UARTx                 USART3
-#define UART_GPIO_PORT        GPIOB
-#define UART_GPIO_AF          GPIO_AF7_USART3
-#define UART_TX_PIN           GPIO_PIN_10
-#define UART_RX_PIN           GPIO_PIN_11
-
-UART_HandleTypeDef UartHandle;
-
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-
-  __HAL_RCC_GPIOC_CLK_ENABLE();  // LED, Button
-  __HAL_RCC_GPIOB_CLK_ENABLE();  // Uart tx, rx
-  __HAL_RCC_USART3_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 168000000
-  *            HCLK(Hz)                       = 168000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 12000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 336
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 7
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 5
-  * @param  None
-  * @retval None
-  */
-static void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 336;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 7;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
-     clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
-}
-
-void board_init(void)
-{
-#if CFG_TUSB_OS  == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  //NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  SystemClock_Config();
-  SystemCoreClockUpdate();
-
-  all_rcc_clk_enable();
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  board_led_write(false);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  // Uart
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
-
-  // USB Pin Init
-  // PA9- VUSB, PA10- ID, PA11- DM, PA12- DP
-
-  /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* This for ID line debug */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  // Enable USB OTG clock
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
-  return len;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/imxrt/boards/mimxrt1010_evk/board.h b/hw/bsp/imxrt/boards/mimxrt1010_evk/board.h
new file mode 100644
index 000000000..4f21b52fa
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1010_evk/board.h
@@ -0,0 +1,53 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#include "fsl_device_registers.h"
+
+// required since iMX RT10xx SDK include this file for board size
+#define BOARD_FLASH_SIZE (0x1000000U)
+
+// LED
+#define LED_PINMUX            IOMUXC_GPIO_11_GPIOMUX_IO11
+#define LED_PORT              GPIO1
+#define LED_PIN               11
+#define LED_STATE_ON          0
+
+// SW8 button
+#define BUTTON_PINMUX         IOMUXC_GPIO_SD_05_GPIO2_IO05
+#define BUTTON_PORT           GPIO2
+#define BUTTON_PIN            5
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_PORT             LPUART1
+#define UART_RX_PINMUX        IOMUXC_GPIO_09_LPUART1_RXD
+#define UART_TX_PINMUX        IOMUXC_GPIO_10_LPUART1_TXD
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/imxrt/boards/mimxrt1010_evk/board.mk b/hw/bsp/imxrt/boards/mimxrt1010_evk/board.mk
new file mode 100644
index 000000000..507db7f00
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1010_evk/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DCPU_MIMXRT1011DAE5A
+MCU_VARIANT = MIMXRT1011
+
+# For flash-jlink target
+JLINK_DEVICE = MIMXRT1011DAE5A
+
+# For flash-pyocd target
+PYOCD_TARGET = mimxrt1010
+
+# flash using pyocd
+flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1010_evk/evkmimxrt1010_flexspi_nor_config.c b/hw/bsp/imxrt/boards/mimxrt1010_evk/evkmimxrt1010_flexspi_nor_config.c
similarity index 100%
rename from hw/bsp/mimxrt1010_evk/evkmimxrt1010_flexspi_nor_config.c
rename to hw/bsp/imxrt/boards/mimxrt1010_evk/evkmimxrt1010_flexspi_nor_config.c
diff --git a/hw/bsp/mimxrt1010_evk/evkmimxrt1010_flexspi_nor_config.h b/hw/bsp/imxrt/boards/mimxrt1010_evk/evkmimxrt1010_flexspi_nor_config.h
similarity index 100%
rename from hw/bsp/mimxrt1010_evk/evkmimxrt1010_flexspi_nor_config.h
rename to hw/bsp/imxrt/boards/mimxrt1010_evk/evkmimxrt1010_flexspi_nor_config.h
diff --git a/hw/bsp/mimxrt1015_evk/board.h b/hw/bsp/imxrt/boards/mimxrt1015_evk/board.h
similarity index 72%
rename from hw/bsp/mimxrt1015_evk/board.h
rename to hw/bsp/imxrt/boards/mimxrt1015_evk/board.h
index 5f3e31586..932ce7fd7 100644
--- a/hw/bsp/mimxrt1015_evk/board.h
+++ b/hw/bsp/imxrt/boards/mimxrt1015_evk/board.h
@@ -31,4 +31,21 @@
 // required since iMX RT10xx SDK include this file for board size
 #define BOARD_FLASH_SIZE (0x1000000U)
 
+// LED
+#define LED_PINMUX            IOMUXC_GPIO_SD_B1_01_GPIO3_IO21
+#define LED_PORT              GPIO3
+#define LED_PIN               21
+#define LED_STATE_ON          0
+
+// SW8 button
+#define BUTTON_PINMUX         IOMUXC_GPIO_EMC_09_GPIO2_IO09
+#define BUTTON_PORT           GPIO2
+#define BUTTON_PIN            9
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_PORT             LPUART1
+#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_07_LPUART1_RX
+#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_06_LPUART1_TX
+
 #endif /* BOARD_H_ */
diff --git a/hw/bsp/imxrt/boards/mimxrt1015_evk/board.mk b/hw/bsp/imxrt/boards/mimxrt1015_evk/board.mk
new file mode 100644
index 000000000..17fd25dfe
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1015_evk/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DCPU_MIMXRT1015DAF5A
+MCU_VARIANT = MIMXRT1015
+
+# For flash-jlink target
+JLINK_DEVICE = MIMXRT1015DAF5A
+
+# For flash-pyocd target
+PYOCD_TARGET = mimxrt1015
+
+# flash using pyocd
+flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1015_evk/evkmimxrt1015_flexspi_nor_config.c b/hw/bsp/imxrt/boards/mimxrt1015_evk/evkmimxrt1015_flexspi_nor_config.c
similarity index 100%
rename from hw/bsp/mimxrt1015_evk/evkmimxrt1015_flexspi_nor_config.c
rename to hw/bsp/imxrt/boards/mimxrt1015_evk/evkmimxrt1015_flexspi_nor_config.c
diff --git a/hw/bsp/mimxrt1015_evk/evkmimxrt1015_flexspi_nor_config.h b/hw/bsp/imxrt/boards/mimxrt1015_evk/evkmimxrt1015_flexspi_nor_config.h
similarity index 100%
rename from hw/bsp/mimxrt1015_evk/evkmimxrt1015_flexspi_nor_config.h
rename to hw/bsp/imxrt/boards/mimxrt1015_evk/evkmimxrt1015_flexspi_nor_config.h
diff --git a/hw/bsp/mimxrt1060_evk/board.h b/hw/bsp/imxrt/boards/mimxrt1020_evk/board.h
similarity index 72%
rename from hw/bsp/mimxrt1060_evk/board.h
rename to hw/bsp/imxrt/boards/mimxrt1020_evk/board.h
index f1bd06369..56ed5855b 100644
--- a/hw/bsp/mimxrt1060_evk/board.h
+++ b/hw/bsp/imxrt/boards/mimxrt1020_evk/board.h
@@ -31,4 +31,21 @@
 // required since iMX RT10xx SDK include this file for board size
 #define BOARD_FLASH_SIZE (0x800000U)
 
+// LED
+#define LED_PINMUX            IOMUXC_GPIO_AD_B0_05_GPIO1_IO05
+#define LED_PORT              GPIO1
+#define LED_PIN               5
+#define LED_STATE_ON          0
+
+// SW8 button
+#define BUTTON_PINMUX         IOMUXC_SNVS_WAKEUP_GPIO5_IO00
+#define BUTTON_PORT           GPIO5
+#define BUTTON_PIN            0
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_PORT             LPUART1
+#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_07_LPUART1_RX
+#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_06_LPUART1_TX
+
 #endif /* BOARD_H_ */
diff --git a/hw/bsp/imxrt/boards/mimxrt1020_evk/board.mk b/hw/bsp/imxrt/boards/mimxrt1020_evk/board.mk
new file mode 100644
index 000000000..b15da1b67
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1020_evk/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DCPU_MIMXRT1021DAG5A
+MCU_VARIANT = MIMXRT1021
+
+# For flash-jlink target
+JLINK_DEVICE = MIMXRT1021DAG5A
+
+# For flash-pyocd target
+PYOCD_TARGET = mimxrt1020
+
+# flash using pyocd
+flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1020_evk/evkmimxrt1020_flexspi_nor_config.c b/hw/bsp/imxrt/boards/mimxrt1020_evk/evkmimxrt1020_flexspi_nor_config.c
similarity index 100%
rename from hw/bsp/mimxrt1020_evk/evkmimxrt1020_flexspi_nor_config.c
rename to hw/bsp/imxrt/boards/mimxrt1020_evk/evkmimxrt1020_flexspi_nor_config.c
diff --git a/hw/bsp/mimxrt1020_evk/evkmimxrt1020_flexspi_nor_config.h b/hw/bsp/imxrt/boards/mimxrt1020_evk/evkmimxrt1020_flexspi_nor_config.h
similarity index 100%
rename from hw/bsp/mimxrt1020_evk/evkmimxrt1020_flexspi_nor_config.h
rename to hw/bsp/imxrt/boards/mimxrt1020_evk/evkmimxrt1020_flexspi_nor_config.h
diff --git a/hw/bsp/imxrt/boards/mimxrt1050_evkb/board.h b/hw/bsp/imxrt/boards/mimxrt1050_evkb/board.h
new file mode 100644
index 000000000..928fbd727
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1050_evkb/board.h
@@ -0,0 +1,51 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+// required since iMX RT10xx SDK include this file for board size
+#define BOARD_FLASH_SIZE (0x4000000U)
+
+// LED
+#define LED_PINMUX            IOMUXC_GPIO_AD_B0_09_GPIO1_IO09
+#define LED_PORT              GPIO1
+#define LED_PIN               9
+#define LED_STATE_ON          0
+
+// SW8 button
+#define BUTTON_PINMUX         IOMUXC_SNVS_WAKEUP_GPIO5_IO00
+#define BUTTON_PORT           GPIO5
+#define BUTTON_PIN            0
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_PORT             LPUART1
+#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_13_LPUART1_RX
+#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_12_LPUART1_TX
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/imxrt/boards/mimxrt1050_evkb/board.mk b/hw/bsp/imxrt/boards/mimxrt1050_evkb/board.mk
new file mode 100644
index 000000000..9fd229105
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1050_evkb/board.mk
@@ -0,0 +1,8 @@
+CFLAGS += -DCPU_MIMXRT1052DVL6B
+MCU_VARIANT = MIMXRT1052
+
+# For flash-pyocd target
+PYOCD_TARGET = mimxrt1050
+
+# flash using pyocd
+flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1050_evkb/evkbimxrt1050_flexspi_nor_config.c b/hw/bsp/imxrt/boards/mimxrt1050_evkb/evkbimxrt1050_flexspi_nor_config.c
similarity index 100%
rename from hw/bsp/mimxrt1050_evkb/evkbimxrt1050_flexspi_nor_config.c
rename to hw/bsp/imxrt/boards/mimxrt1050_evkb/evkbimxrt1050_flexspi_nor_config.c
diff --git a/hw/bsp/mimxrt1050_evkb/evkbimxrt1050_flexspi_nor_config.h b/hw/bsp/imxrt/boards/mimxrt1050_evkb/evkbimxrt1050_flexspi_nor_config.h
similarity index 100%
rename from hw/bsp/mimxrt1050_evkb/evkbimxrt1050_flexspi_nor_config.h
rename to hw/bsp/imxrt/boards/mimxrt1050_evkb/evkbimxrt1050_flexspi_nor_config.h
diff --git a/hw/bsp/imxrt/boards/mimxrt1060_evk/board.h b/hw/bsp/imxrt/boards/mimxrt1060_evk/board.h
new file mode 100644
index 000000000..7fa37e33f
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1060_evk/board.h
@@ -0,0 +1,51 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+// required since iMX RT10xx SDK include this file for board size
+#define BOARD_FLASH_SIZE (0x800000U)
+
+// LED
+#define LED_PINMUX            IOMUXC_GPIO_AD_B0_09_GPIO1_IO09
+#define LED_PORT              GPIO1
+#define LED_PIN               9
+#define LED_STATE_ON          0
+
+// SW8 button
+#define BUTTON_PINMUX         IOMUXC_SNVS_WAKEUP_GPIO5_IO00
+#define BUTTON_PORT           GPIO5
+#define BUTTON_PIN            0
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_PORT             LPUART1
+#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_13_LPUART1_RX
+#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_12_LPUART1_TX
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/imxrt/boards/mimxrt1060_evk/board.mk b/hw/bsp/imxrt/boards/mimxrt1060_evk/board.mk
new file mode 100644
index 000000000..d0498dbb1
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1060_evk/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DCPU_MIMXRT1062DVL6A
+MCU_VARIANT = MIMXRT1062
+
+# For flash-jlink target
+JLINK_DEVICE = MIMXRT1062xxx6A
+
+# For flash-pyocd target
+PYOCD_TARGET = mimxrt1060
+
+# flash using pyocd
+flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1060_evk/evkmimxrt1060_flexspi_nor_config.c b/hw/bsp/imxrt/boards/mimxrt1060_evk/evkmimxrt1060_flexspi_nor_config.c
similarity index 100%
rename from hw/bsp/mimxrt1060_evk/evkmimxrt1060_flexspi_nor_config.c
rename to hw/bsp/imxrt/boards/mimxrt1060_evk/evkmimxrt1060_flexspi_nor_config.c
diff --git a/hw/bsp/mimxrt1060_evk/evkmimxrt1060_flexspi_nor_config.h b/hw/bsp/imxrt/boards/mimxrt1060_evk/evkmimxrt1060_flexspi_nor_config.h
similarity index 100%
rename from hw/bsp/mimxrt1060_evk/evkmimxrt1060_flexspi_nor_config.h
rename to hw/bsp/imxrt/boards/mimxrt1060_evk/evkmimxrt1060_flexspi_nor_config.h
diff --git a/hw/bsp/mimxrt1064_evk/board.h b/hw/bsp/imxrt/boards/mimxrt1064_evk/board.h
similarity index 72%
rename from hw/bsp/mimxrt1064_evk/board.h
rename to hw/bsp/imxrt/boards/mimxrt1064_evk/board.h
index 3157e7d5e..5f51e91a2 100644
--- a/hw/bsp/mimxrt1064_evk/board.h
+++ b/hw/bsp/imxrt/boards/mimxrt1064_evk/board.h
@@ -31,4 +31,22 @@
 // required since iMX RT10xx SDK include this file for board size
 #define BOARD_FLASH_SIZE (0x400000U)
 
+// LED
+#define LED_PINMUX            IOMUXC_GPIO_AD_B0_09_GPIO1_IO09
+#define LED_PORT              GPIO1
+#define LED_PIN               9
+#define LED_STATE_ON          0
+
+// SW8 button
+#define BUTTON_PINMUX         IOMUXC_SNVS_WAKEUP_GPIO5_IO00
+#define BUTTON_PORT           GPIO5
+#define BUTTON_PIN            0
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_PORT             LPUART1
+#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_13_LPUART1_RX
+#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_12_LPUART1_TX
+
+
 #endif /* BOARD_H_ */
diff --git a/hw/bsp/imxrt/boards/mimxrt1064_evk/board.mk b/hw/bsp/imxrt/boards/mimxrt1064_evk/board.mk
new file mode 100644
index 000000000..586d74fe5
--- /dev/null
+++ b/hw/bsp/imxrt/boards/mimxrt1064_evk/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DCPU_MIMXRT1064DVL6A
+MCU_VARIANT = MIMXRT1064
+
+# For flash-jlink target
+JLINK_DEVICE = MIMXRT1064xxx6A
+
+# For flash-pyocd target
+PYOCD_TARGET = mimxrt1064
+
+# flash using pyocd
+flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1064_evk/evkmimxrt1064_flexspi_nor_config.c b/hw/bsp/imxrt/boards/mimxrt1064_evk/evkmimxrt1064_flexspi_nor_config.c
similarity index 100%
rename from hw/bsp/mimxrt1064_evk/evkmimxrt1064_flexspi_nor_config.c
rename to hw/bsp/imxrt/boards/mimxrt1064_evk/evkmimxrt1064_flexspi_nor_config.c
diff --git a/hw/bsp/mimxrt1064_evk/evkmimxrt1064_flexspi_nor_config.h b/hw/bsp/imxrt/boards/mimxrt1064_evk/evkmimxrt1064_flexspi_nor_config.h
similarity index 100%
rename from hw/bsp/mimxrt1064_evk/evkmimxrt1064_flexspi_nor_config.h
rename to hw/bsp/imxrt/boards/mimxrt1064_evk/evkmimxrt1064_flexspi_nor_config.h
diff --git a/hw/bsp/imxrt/boards/teensy_40/board.h b/hw/bsp/imxrt/boards/teensy_40/board.h
new file mode 100644
index 000000000..b3cc0a8c5
--- /dev/null
+++ b/hw/bsp/imxrt/boards/teensy_40/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+
+// required since iMX RT10xx SDK include this file for board size
+#define BOARD_FLASH_SIZE (2 * 1024 * 1024)
+
+// LED
+#define LED_PINMUX            IOMUXC_GPIO_B0_03_GPIO2_IO03 // D13
+#define LED_PORT              GPIO2
+#define LED_PIN               3
+#define LED_STATE_ON          0
+
+// no button
+#define BUTTON_PINMUX         IOMUXC_GPIO_B0_01_GPIO2_IO01 // D12
+#define BUTTON_PORT           GPIO2
+#define BUTTON_PIN            1
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_PORT             LPUART6
+#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_03_LPUART6_RX  // D0
+#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_02_LPUART6_TX  // D1
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/imxrt/boards/teensy_40/board.mk b/hw/bsp/imxrt/boards/teensy_40/board.mk
new file mode 100644
index 000000000..02f77193f
--- /dev/null
+++ b/hw/bsp/imxrt/boards/teensy_40/board.mk
@@ -0,0 +1,10 @@
+CFLAGS += -DCPU_MIMXRT1062DVL6A
+MCU_VARIANT = MIMXRT1062
+
+# For flash-jlink target
+JLINK_DEVICE = MIMXRT1062xxx6A
+
+# flash by using teensy_loader_cli https://github.com/PaulStoffregen/teensy_loader_cli
+# Make sure it is in your PATH 
+flash: $(BUILD)/$(BOARD)-firmware.hex
+	teensy_loader_cli --mcu=imxrt1062 -v -w $<
diff --git a/hw/bsp/teensy_40/teensy40_flexspi_nor_config.c b/hw/bsp/imxrt/boards/teensy_40/teensy40_flexspi_nor_config.c
similarity index 96%
rename from hw/bsp/teensy_40/teensy40_flexspi_nor_config.c
rename to hw/bsp/imxrt/boards/teensy_40/teensy40_flexspi_nor_config.c
index dbedc90a0..7929906eb 100644
--- a/hw/bsp/teensy_40/teensy40_flexspi_nor_config.c
+++ b/hw/bsp/imxrt/boards/teensy_40/teensy40_flexspi_nor_config.c
@@ -5,7 +5,7 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include "teensy40_flexspi_nor_config.h"
+#include <bsp/imxrt/boards/teensy_40/teensy40_flexspi_nor_config.h>
 
 /* Component ID definition, used by tools. */
 #ifndef FSL_COMPONENT_ID
diff --git a/hw/bsp/teensy_40/teensy40_flexspi_nor_config.h b/hw/bsp/imxrt/boards/teensy_40/teensy40_flexspi_nor_config.h
similarity index 100%
rename from hw/bsp/teensy_40/teensy40_flexspi_nor_config.h
rename to hw/bsp/imxrt/boards/teensy_40/teensy40_flexspi_nor_config.h
diff --git a/hw/bsp/mimxrt1060_evk/mimxrt1060_evk.c b/hw/bsp/imxrt/family.c
similarity index 89%
rename from hw/bsp/mimxrt1060_evk/mimxrt1060_evk.c
rename to hw/bsp/imxrt/family.c
index 6fb00b9b7..9dff104f1 100644
--- a/hw/bsp/mimxrt1060_evk/mimxrt1060_evk.c
+++ b/hw/bsp/imxrt/family.c
@@ -24,7 +24,8 @@
  * This file is part of the TinyUSB stack.
  */
 
-#include "../board.h"
+#include "bsp/board.h"
+#include "board.h"
 #include "fsl_device_registers.h"
 #include "fsl_gpio.h"
 #include "fsl_iomuxc.h"
@@ -33,22 +34,6 @@
 
 #include "clock_config.h"
 
-#define LED_PINMUX            IOMUXC_GPIO_AD_B0_09_GPIO1_IO09
-#define LED_PORT              GPIO1
-#define LED_PIN               9
-#define LED_STATE_ON          0
-
-// SW8 button
-#define BUTTON_PINMUX         IOMUXC_SNVS_WAKEUP_GPIO5_IO00
-#define BUTTON_PORT           GPIO5
-#define BUTTON_PIN            0
-#define BUTTON_STATE_ACTIVE   0
-
-// UART
-#define UART_PORT             LPUART1
-#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_13_LPUART1_RX
-#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_12_LPUART1_TX
-
 // needed by fsl_flexspi_nor_boot
 const uint8_t dcd_data[] = { 0x00 };
 
@@ -79,6 +64,7 @@ void board_init(void)
 
   // Button
   IOMUXC_SetPinMux( BUTTON_PINMUX, 0U);
+  IOMUXC_SetPinConfig(BUTTON_PINMUX, 0x01B0A0U);
   gpio_pin_config_t button_config = { kGPIO_DigitalInput, 0, kGPIO_IntRisingEdge, };
   GPIO_PinInit(BUTTON_PORT, BUTTON_PIN, &button_config);
 
@@ -100,7 +86,14 @@ void board_init(void)
   CLOCK_EnableUsbhs0PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
   CLOCK_EnableUsbhs0Clock(kCLOCK_Usb480M, 480000000U);
 
-  USBPHY_Type* usb_phy = USBPHY1;
+  USBPHY_Type* usb_phy;
+
+  // RT105x RT106x have dual USB controller. TODO support USB2
+#ifdef USBPHY1
+  usb_phy = USBPHY1;
+#else
+  usb_phy = USBPHY;
+#endif
 
   // Enable PHY support for Low speed device + LS via FS Hub
   usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
diff --git a/hw/bsp/mimxrt1015_evk/board.mk b/hw/bsp/imxrt/family.mk
similarity index 70%
rename from hw/bsp/mimxrt1015_evk/board.mk
rename to hw/bsp/imxrt/family.mk
index 3ce7c2f82..47d403069 100644
--- a/hw/bsp/mimxrt1015_evk/board.mk
+++ b/hw/bsp/imxrt/family.mk
@@ -1,3 +1,5 @@
+include $(TOP)/$(BOARD_PATH)/board.mk
+
 CFLAGS += \
   -mthumb \
   -mabi=aapcs \
@@ -5,7 +7,6 @@ CFLAGS += \
   -mfloat-abi=hard \
   -mfpu=fpv5-d16 \
   -D__ARMVFP__=0 -D__ARMFPV5__=0\
-  -DCPU_MIMXRT1015DAF5A \
   -DXIP_EXTERNAL_FLASH=1 \
   -DXIP_BOOT_HEADER_ENABLE=1 \
   -DCFG_TUSB_MCU=OPT_MCU_MIMXRT10XX
@@ -13,13 +14,17 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=unused-parameter -Wno-error=implicit-fallthrough=
 
-MCU_DIR = hw/mcu/nxp/sdk/devices/MIMXRT1015
+MCU_DIR = hw/mcu/nxp/sdk/devices/$(MCU_VARIANT)
 
 # All source paths should be relative to the top level.
-LD_FILE = $(MCU_DIR)/gcc/MIMXRT1015xxxxx_flexspi_nor.ld
+LD_FILE = $(MCU_DIR)/gcc/$(MCU_VARIANT)xxxxx_flexspi_nor.ld
+
+# TODO for net_lwip_webserver exmaple, but may not needed !! 
+LDFLAGS += \
+	-Wl,--defsym,__stack_size__=0x800 \
 
 SRC_C += \
-	$(MCU_DIR)/system_MIMXRT1015.c \
+	$(MCU_DIR)/system_$(MCU_VARIANT).c \
 	$(MCU_DIR)/xip/fsl_flexspi_nor_boot.c \
 	$(MCU_DIR)/project_template/clock_config.c \
 	$(MCU_DIR)/drivers/fsl_clock.c \
@@ -28,13 +33,13 @@ SRC_C += \
 	$(MCU_DIR)/drivers/fsl_lpuart.c
 
 INC += \
-	$(TOP)/hw/bsp/$(BOARD) \
+	$(TOP)/$(BOARD_PATH) \
 	$(TOP)/$(MCU_DIR)/../../CMSIS/Include \
 	$(TOP)/$(MCU_DIR) \
 	$(TOP)/$(MCU_DIR)/drivers \
 	$(TOP)/$(MCU_DIR)/project_template \
 
-SRC_S += $(MCU_DIR)/gcc/startup_MIMXRT1015.S
+SRC_S += $(MCU_DIR)/gcc/startup_$(MCU_VARIANT).S
 
 # For TinyUSB port source
 VENDOR = nxp
@@ -43,11 +48,3 @@ CHIP_FAMILY = transdimension
 # For freeRTOS port source
 FREERTOS_PORT = ARM_CM7/r0p1
 
-# For flash-jlink target
-JLINK_DEVICE = MIMXRT1015DAF5A
-
-# For flash-pyocd target
-PYOCD_TARGET = mimxrt1015
-
-# flash using pyocd
-flash: flash-pyocd
diff --git a/hw/bsp/itsybitsy_m4/board.mk b/hw/bsp/itsybitsy_m4/board.mk
deleted file mode 100644
index 6cc6a9091..000000000
--- a/hw/bsp/itsybitsy_m4/board.mk
+++ /dev/null
@@ -1,53 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs-linux \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -D__SAMD51J19A__ \
-  -DCFG_TUSB_MCU=OPT_MCU_SAMD51
-
-CFLAGS += -Wno-error=undef
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd51g19a_flash.ld
-
-SRC_C += \
-	hw/mcu/microchip/asf4/samd51/gcc/gcc/startup_samd51.c \
-	hw/mcu/microchip/asf4/samd51/gcc/system_samd51.c \
-	hw/mcu/microchip/asf4/samd51/hpl/gclk/hpl_gclk.c \
-	hw/mcu/microchip/asf4/samd51/hpl/mclk/hpl_mclk.c \
-	hw/mcu/microchip/asf4/samd51/hpl/osc32kctrl/hpl_osc32kctrl.c \
-	hw/mcu/microchip/asf4/samd51/hpl/oscctrl/hpl_oscctrl.c \
-	hw/mcu/microchip/asf4/samd51/hal/src/hal_atomic.c
-
-INC += \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/config \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/hal/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/hal/utils/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/hpl/port \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/hri \
-	$(TOP)/hw/mcu/microchip/asf4/samd51/CMSIS/Include
-
-# For TinyUSB port source
-VENDOR = microchip
-CHIP_FAMILY = samd
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD51J19
-
-# flash using bossac at least version 1.8
-# can be found in arduino15/packages/arduino/tools/bossac/
-# Add it to your PATH or change BOSSAC variable to match your installation
-BOSSAC = bossac
-
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	$(BOSSAC) --port=$(SERIAL) -U -i --offset=0x4000 -e -w $^ -R
diff --git a/hw/bsp/itsybitsy_m4/itsybitsy_m4.c b/hw/bsp/itsybitsy_m4/itsybitsy_m4.c
deleted file mode 100644
index 0195a9fc4..000000000
--- a/hw/bsp/itsybitsy_m4/itsybitsy_m4.c
+++ /dev/null
@@ -1,163 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "sam.h"
-#include "bsp/board.h"
-
-#include "hal/include/hal_gpio.h"
-#include "hal/include/hal_init.h"
-#include "hpl/gclk/hpl_gclk_base.h"
-#include "hpl_mclk_config.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USB_0_Handler (void)
-{
-  tud_int_handler(0);
-}
-
-void USB_1_Handler (void)
-{
-  tud_int_handler(0);
-}
-
-void USB_2_Handler (void)
-{
-  tud_int_handler(0);
-}
-
-void USB_3_Handler (void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-#define LED_PIN      22
-#define BUTTON_PIN   18  // pin D5
-
-/* Referenced GCLKs, should be initialized firstly */
-#define _GCLK_INIT_1ST 0xFFFFFFFF
-
-/* Not referenced GCLKs, initialized last */
-#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
-
-void board_init(void)
-{
-  // Clock init ( follow hpl_init.c )
-  hri_nvmctrl_set_CTRLA_RWS_bf(NVMCTRL, 0);
-
-  _osc32kctrl_init_sources();
-  _oscctrl_init_sources();
-  _mclk_init();
-#if _GCLK_INIT_1ST
-  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
-#endif
-  _oscctrl_init_referenced_generators();
-  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
-
-  // Update SystemCoreClock since it is hard coded with asf4 and not correct
-  // Init 1ms tick timer (samd SystemCoreClock may not correct)
-  SystemCoreClock = CONF_CPU_FREQUENCY;
-  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
-
-  // Led init
-  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 0);
-
-  // Button init
-  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
-
-#if CFG_TUSB_OS  == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  NVIC_SetPriority(USB_0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-  NVIC_SetPriority(USB_1_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-  NVIC_SetPriority(USB_2_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-  NVIC_SetPriority(USB_3_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-#endif
-
-  /* USB Clock init
-   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
-   * for low speed and full speed operation. */
-  hri_gclk_write_PCHCTRL_reg(GCLK, USB_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK1_Val | GCLK_PCHCTRL_CHEN);
-  hri_mclk_set_AHBMASK_USB_bit(MCLK);
-  hri_mclk_set_APBBMASK_USB_bit(MCLK);
-
-  // USB Pin Init
-  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA24, false);
-  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
-  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA25, false);
-  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
-
-  gpio_set_pin_function(PIN_PA24, PINMUX_PA24H_USB_DM);
-  gpio_set_pin_function(PIN_PA25, PINMUX_PA25H_USB_DP);
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  gpio_set_pin_level(LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active low
-  return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/itsybitsy_nrf52840/board.mk b/hw/bsp/itsybitsy_nrf52840/board.mk
deleted file mode 100644
index 059e55dff..000000000
--- a/hw/bsp/itsybitsy_nrf52840/board.mk
+++ /dev/null
@@ -1,69 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X \
-  -DNRF52840_XXAA \
-  -DCONFIG_GPIO_AS_PINRESET
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/nrf52840_s140_v6.ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-  hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-  hw/mcu/nordic/nrfx/drivers/src/nrfx_uarte.c \
-  hw/mcu/nordic/nrfx/mdk/system_nrf52840.c
-
-INC += \
-  $(TOP)/lib/CMSIS_4/CMSIS/Include \
-  $(TOP)/hw/mcu/nordic \
-  $(TOP)/hw/mcu/nordic/nrfx \
-  $(TOP)/hw/mcu/nordic/nrfx/mdk \
-  $(TOP)/hw/mcu/nordic/nrfx/hal \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-  $(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# For uf2 conversion
-UF2_FAMILY = 0xADA52840
-
-$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
-	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
-	
-# flash using adafruit-nrfutil dfu
-flash: $(BUILD)/$(BOARD)-firmware.zip
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/itsybitsy_nrf52840/itsybitsy_nrf52840.c b/hw/bsp/itsybitsy_nrf52840/itsybitsy_nrf52840.c
deleted file mode 100644
index e9e5a3876..000000000
--- a/hw/bsp/itsybitsy_nrf52840/itsybitsy_nrf52840.c
+++ /dev/null
@@ -1,225 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-#include "nrfx/drivers/include/nrfx_uarte.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define _PINNUM(port, pin)    ((port)*32 + (pin))
-
-#define LED_PIN         _PINNUM(0, 6)
-#define LED_STATE_ON    1
-
-#define BUTTON_PIN      _PINNUM(0, 29)
-
-#define UART_RX_PIN     25
-#define UART_TX_PIN     24
-
-static nrfx_uarte_t _uart_id = NRFX_UARTE_INSTANCE(0);
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // stop LF clock just in case we jump from application without reset
-  NRF_CLOCK->TASKS_LFCLKSTOP = 1UL;
-
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-
-  // UART
-  nrfx_uarte_config_t uart_cfg =
-  {
-    .pseltxd   = UART_TX_PIN,
-    .pselrxd   = UART_RX_PIN,
-    .pselcts   = NRF_UARTE_PSEL_DISCONNECTED,
-    .pselrts   = NRF_UARTE_PSEL_DISCONNECTED,
-    .p_context = NULL,
-    .baudrate  = NRF_UARTE_BAUDRATE_115200, // CFG_BOARD_UART_BAUDRATE
-    .interrupt_priority = 7,
-    .hal_cfg = {
-      .hwfc      = NRF_UARTE_HWFC_DISABLED,
-      .parity    = NRF_UARTE_PARITY_EXCLUDED,
-    }
-  };
-
-  nrfx_uarte_init(&_uart_id, &uart_cfg, NULL); //uart_handler);
-
-  //------------- USB -------------//
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active LOW
-  return (nrf_gpio_pin_read(BUTTON_PIN) ? 0 : 1);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-//  return NRFX_SUCCESS == nrfx_uart_rx(&_uart_id, buf, (size_t) len) ? len : 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  return (NRFX_SUCCESS == nrfx_uarte_tx(&_uart_id, (uint8_t const*) buf, (size_t) len)) ? len : 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/luna/board.mk b/hw/bsp/luna/board.mk
deleted file mode 100644
index 272c9f4e1..000000000
--- a/hw/bsp/luna/board.mk
+++ /dev/null
@@ -1,46 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs-linux \
-  -mcpu=cortex-m0plus \
-  -nostdlib -nostartfiles \
-  -D__SAMD21G18A__ \
-  -DCONF_DFLL_OVERWRITE_CALIBRATION=0 \
-  -DCFG_TUSB_MCU=OPT_MCU_SAMD21
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd21g18a_flash.ld
-
-SRC_C += \
-	hw/mcu/microchip/asf4/samd21/gcc/gcc/startup_samd21.c \
-	hw/mcu/microchip/asf4/samd21/gcc/system_samd21.c \
-	hw/mcu/microchip/asf4/samd21/hpl/gclk/hpl_gclk.c \
-	hw/mcu/microchip/asf4/samd21/hpl/pm/hpl_pm.c \
-	hw/mcu/microchip/asf4/samd21/hpl/sysctrl/hpl_sysctrl.c \
-	hw/mcu/microchip/asf4/samd21/hal/src/hal_atomic.c
-
-INC += \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/config \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hal/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hal/utils/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hpl/pm/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hpl/port \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hri \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/CMSIS/Include
-
-# For TinyUSB port source
-VENDOR = microchip
-CHIP_FAMILY = samd
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM0
-
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD21G18
-
-# flash using jlink
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	dfu-util -a 0 -d 1d50:615c -D $< || dfu-util -a 0 -d 16d0:05a5 -D $<
-
diff --git a/hw/bsp/luna/luna.c b/hw/bsp/luna/luna.c
deleted file mode 100644
index fa321aa43..000000000
--- a/hw/bsp/luna/luna.c
+++ /dev/null
@@ -1,144 +0,0 @@
-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "sam.h"
-#include "hal/include/hal_gpio.h"
-#include "hal/include/hal_init.h"
-#include "hri/hri_nvmctrl_d21.h"
-
-#include "hpl/gclk/hpl_gclk_base.h"
-#include "hpl_pm_config.h"
-#include "hpl/pm/hpl_pm_base.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USB_Handler(void)
-{
-  tud_int_handler(0);
-}
-
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-#define LED_PIN      PIN_PA22 // pin PA22
-#define BUTTON_PIN   PIN_PB22 // pin PB22
-
-/* Referenced GCLKs, should be initialized firstly */
-#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
-
-/* Not referenced GCLKs, initialized last */
-#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
-
-void board_init(void)
-{
-  // Clock init ( follow hpl_init.c )
-  hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);
-
-  _pm_init();
-  _sysctrl_init_sources();
-#if _GCLK_INIT_1ST
-  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
-#endif
-  _sysctrl_init_referenced_generators();
-  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
-
-  // 1ms tick timer (samd SystemCoreClock may not correct)
-  SystemCoreClock = CONF_CPU_FREQUENCY;
-  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
-
-  // Led init
-  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 0);
-
-  // Button init
-  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
-
-  /* USB Clock init
-   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
-   * for low speed and full speed operation. */
-  _pm_enable_bus_clock(PM_BUS_APBB, USB);
-  _pm_enable_bus_clock(PM_BUS_AHB, USB);
-  _gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-
-  // USB Pin Init
-  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA24, false);
-  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
-  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA25, false);
-  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
-
-  gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
-  gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  gpio_set_pin_level(LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active low
-  return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-
-volatile uint32_t system_ticks = 0;
-
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-
-#endif
diff --git a/hw/bsp/metro_m0_express/board.mk b/hw/bsp/metro_m0_express/board.mk
deleted file mode 100644
index 61dc7c665..000000000
--- a/hw/bsp/metro_m0_express/board.mk
+++ /dev/null
@@ -1,50 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs-linux \
-  -mcpu=cortex-m0plus \
-  -nostdlib -nostartfiles \
-  -D__SAMD21G18A__ \
-  -DCONF_DFLL_OVERWRITE_CALIBRATION=0 \
-  -DCFG_TUSB_MCU=OPT_MCU_SAMD21
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd21g18a_flash.ld
-
-SRC_C += \
-	hw/mcu/microchip/asf4/samd21/gcc/gcc/startup_samd21.c \
-	hw/mcu/microchip/asf4/samd21/gcc/system_samd21.c \
-	hw/mcu/microchip/asf4/samd21/hpl/gclk/hpl_gclk.c \
-	hw/mcu/microchip/asf4/samd21/hpl/pm/hpl_pm.c \
-	hw/mcu/microchip/asf4/samd21/hpl/sysctrl/hpl_sysctrl.c \
-	hw/mcu/microchip/asf4/samd21/hal/src/hal_atomic.c
-
-INC += \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/config \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hal/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hal/utils/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hpl/pm/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hpl/port \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hri \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/CMSIS/Include
-
-# For TinyUSB port source 
-VENDOR = microchip
-CHIP_FAMILY = samd
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM0
-
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD21G18
-
-# flash using bossac at least version 1.8
-# can be found in arduino15/packages/arduino/tools/bossac/
-# Add it to your PATH or change BOSSAC variable to match your installation
-BOSSAC = bossac
-
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	$(BOSSAC) --port=$(SERIAL) -U -i --offset=0x2000 -e -w $^ -R
diff --git a/hw/bsp/metro_m0_express/metro_m0_express.c b/hw/bsp/metro_m0_express/metro_m0_express.c
deleted file mode 100644
index 4eb157c8f..000000000
--- a/hw/bsp/metro_m0_express/metro_m0_express.c
+++ /dev/null
@@ -1,155 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "sam.h"
-#include "bsp/board.h"
-
-#include "hal/include/hal_gpio.h"
-#include "hal/include/hal_init.h"
-#include "hri/hri_nvmctrl_d21.h"
-
-#include "hpl/gclk/hpl_gclk_base.h"
-#include "hpl_pm_config.h"
-#include "hpl/pm/hpl_pm_base.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USB_Handler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-#define LED_PIN      17
-#define BUTTON_PIN   15 // pin D5
-
-/* Referenced GCLKs, should be initialized firstly */
-#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
-
-/* Not referenced GCLKs, initialized last */
-#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
-
-void board_init(void)
-{
-  // Clock init ( follow hpl_init.c )
-  hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);
-
-  _pm_init();
-  _sysctrl_init_sources();
-#if _GCLK_INIT_1ST
-  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
-#endif
-  _sysctrl_init_referenced_generators();
-  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
-
-  // Update SystemCoreClock since it is hard coded with asf4 and not correct
-  // Init 1ms tick timer (samd SystemCoreClock may not correct)
-  SystemCoreClock = CONF_CPU_FREQUENCY;
-  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
-
-  // Led init
-  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 0);
-
-  // Button init
-  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
-
-#if CFG_TUSB_OS  == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  NVIC_SetPriority(USB_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-#endif
-
-  /* USB Clock init
-   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
-   * for low speed and full speed operation. */
-  _pm_enable_bus_clock(PM_BUS_APBB, USB);
-  _pm_enable_bus_clock(PM_BUS_AHB, USB);
-  _gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-
-  // USB Pin Init
-  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA24, false);
-  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
-  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA25, false);
-  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
-
-  gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
-  gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
-
-  // Output 500hz PWM on D12 (PA19 - TCC0 WO[3]) so we can validate the GCLK0 clock speed with a Saleae.
-  _pm_enable_bus_clock(PM_BUS_APBC, TCC0);
-  TCC0->PER.bit.PER = 48000000 / 1000;
-  TCC0->CC[3].bit.CC = 48000000 / 2000;
-  TCC0->CTRLA.bit.ENABLE = true;
-
-  gpio_set_pin_function(PIN_PA19, PINMUX_PA19F_TCC0_WO3);
-  _gclk_enable_channel(TCC0_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  gpio_set_pin_level(LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active low
-  return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/metro_m4_express/metro_m4_express.c b/hw/bsp/metro_m4_express/metro_m4_express.c
deleted file mode 100644
index b489b79c4..000000000
--- a/hw/bsp/metro_m4_express/metro_m4_express.c
+++ /dev/null
@@ -1,163 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "sam.h"
-#include "bsp/board.h"
-
-#include "hal/include/hal_gpio.h"
-#include "hal/include/hal_init.h"
-#include "hpl/gclk/hpl_gclk_base.h"
-#include "hpl_mclk_config.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USB_0_Handler (void)
-{
-  tud_int_handler(0);
-}
-
-void USB_1_Handler (void)
-{
-  tud_int_handler(0);
-}
-
-void USB_2_Handler (void)
-{
-  tud_int_handler(0);
-}
-
-void USB_3_Handler (void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-#define LED_PIN      16
-#define BUTTON_PIN   (14 + 32)  // pin D5
-
-/* Referenced GCLKs, should be initialized firstly */
-#define _GCLK_INIT_1ST 0xFFFFFFFF
-
-/* Not referenced GCLKs, initialized last */
-#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
-
-void board_init(void)
-{
-  // Clock init ( follow hpl_init.c )
-  hri_nvmctrl_set_CTRLA_RWS_bf(NVMCTRL, 0);
-
-  _osc32kctrl_init_sources();
-  _oscctrl_init_sources();
-  _mclk_init();
-#if _GCLK_INIT_1ST
-  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
-#endif
-  _oscctrl_init_referenced_generators();
-  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
-
-  // Update SystemCoreClock since it is hard coded with asf4 and not correct
-  // Init 1ms tick timer (samd SystemCoreClock may not correct)
-  SystemCoreClock = CONF_CPU_FREQUENCY;
-  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
-
-  // Led init
-  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 0);
-
-  // Button init
-  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
-
-#if CFG_TUSB_OS  == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  NVIC_SetPriority(USB_0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-  NVIC_SetPriority(USB_1_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-  NVIC_SetPriority(USB_2_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-  NVIC_SetPriority(USB_3_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-#endif
-
-  /* USB Clock init
-   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
-   * for low speed and full speed operation. */
-  hri_gclk_write_PCHCTRL_reg(GCLK, USB_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK1_Val | GCLK_PCHCTRL_CHEN);
-  hri_mclk_set_AHBMASK_USB_bit(MCLK);
-  hri_mclk_set_APBBMASK_USB_bit(MCLK);
-
-  // USB Pin Init
-  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA24, false);
-  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
-  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA25, false);
-  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
-
-  gpio_set_pin_function(PIN_PA24, PINMUX_PA24H_USB_DM);
-  gpio_set_pin_function(PIN_PA25, PINMUX_PA25H_USB_DP);
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  gpio_set_pin_level(LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active low
-  return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/mimxrt1010_evk/board.mk b/hw/bsp/mimxrt1010_evk/board.mk
deleted file mode 100644
index bb714c1c5..000000000
--- a/hw/bsp/mimxrt1010_evk/board.mk
+++ /dev/null
@@ -1,57 +0,0 @@
-CFLAGS += \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -D__ARMVFP__=0 -D__ARMFPV5__=0\
-  -DCPU_MIMXRT1011DAE5A \
-  -DXIP_EXTERNAL_FLASH=1 \
-  -DXIP_BOOT_HEADER_ENABLE=1 \
-  -DCFG_TUSB_MCU=OPT_MCU_MIMXRT10XX
-
-# mcu driver cause following warnings
-# CFLAGS += -Wno-error=unused-parameter -Wno-error=implicit-fallthrough=
-CFLAGS += -Wno-error=unused-parameter
-
-MCU_DIR = hw/mcu/nxp/sdk/devices/MIMXRT1011
-
-# All source paths should be relative to the top level.
-LD_FILE = $(MCU_DIR)/gcc/MIMXRT1011xxxxx_flexspi_nor.ld
-
-LDFLAGS += \
-	-Wl,--defsym,__stack_size__=0x800 \
-
-SRC_C += \
-	$(MCU_DIR)/system_MIMXRT1011.c \
-	$(MCU_DIR)/xip/fsl_flexspi_nor_boot.c \
-	$(MCU_DIR)/project_template/clock_config.c \
-	$(MCU_DIR)/drivers/fsl_clock.c \
-	$(MCU_DIR)/drivers/fsl_gpio.c \
-	$(MCU_DIR)/drivers/fsl_common.c \
-	$(MCU_DIR)/drivers/fsl_lpuart.c
-
-INC += \
-	$(TOP)/hw/bsp/$(BOARD) \
-	$(TOP)/$(MCU_DIR)/../../CMSIS/Include \
-	$(TOP)/$(MCU_DIR) \
-	$(TOP)/$(MCU_DIR)/drivers \
-	$(TOP)/$(MCU_DIR)/project_template \
-
-SRC_S += $(MCU_DIR)/gcc/startup_MIMXRT1011.S
-
-# For TinyUSB port source
-VENDOR = nxp
-CHIP_FAMILY = transdimension
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# For flash-jlink target
-JLINK_DEVICE = MIMXRT1011DAE5A
-
-# For flash-pyocd target
-PYOCD_TARGET = mimxrt1010
-
-# flash using pyocd
-flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1010_evk/mimxrt1010_evk.c b/hw/bsp/mimxrt1010_evk/mimxrt1010_evk.c
deleted file mode 100644
index 1c4b1798c..000000000
--- a/hw/bsp/mimxrt1010_evk/mimxrt1010_evk.c
+++ /dev/null
@@ -1,170 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2018, hathach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-#include "fsl_device_registers.h"
-#include "fsl_gpio.h"
-#include "fsl_iomuxc.h"
-#include "fsl_clock.h"
-#include "fsl_lpuart.h"
-
-#include "clock_config.h"
-
-#define LED_PINMUX            IOMUXC_GPIO_11_GPIOMUX_IO11
-#define LED_PORT              GPIO1
-#define LED_PIN               11
-#define LED_STATE_ON          0
-
-// SW8 button
-#define BUTTON_PINMUX         IOMUXC_GPIO_SD_05_GPIO2_IO05
-#define BUTTON_PORT           GPIO2
-#define BUTTON_PIN            5
-#define BUTTON_STATE_ACTIVE   0
-
-// UART
-#define UART_PORT             LPUART1
-#define UART_RX_PINMUX        IOMUXC_GPIO_09_LPUART1_RXD
-#define UART_TX_PINMUX        IOMUXC_GPIO_10_LPUART1_TXD
-
-const uint8_t dcd_data[] = { 0x00 };
-
-void board_init(void)
-{
-  // Init clock
-  BOARD_BootClockRUN();
-  SystemCoreClockUpdate();
-
-  // Enable IOCON clock
-  CLOCK_EnableClock(kCLOCK_Iomuxc);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-//  NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  // LED
-  IOMUXC_SetPinMux( LED_PINMUX, 0U);
-  IOMUXC_SetPinConfig( LED_PINMUX, 0x10B0U);
-
-  gpio_pin_config_t led_config = { kGPIO_DigitalOutput, 0, kGPIO_NoIntmode };
-  GPIO_PinInit(LED_PORT, LED_PIN, &led_config);
-  board_led_write(true);
-
-  // Button
-  IOMUXC_SetPinMux( BUTTON_PINMUX, 0U);
-  IOMUXC_SetPinConfig(BUTTON_PINMUX, 0x01B0A0U);
-  gpio_pin_config_t button_config = { kGPIO_DigitalInput, 0, kGPIO_IntRisingEdge, };
-  GPIO_PinInit(BUTTON_PORT, BUTTON_PIN, &button_config);
-
-  // UART
-  IOMUXC_SetPinMux( UART_TX_PINMUX, 0U);
-  IOMUXC_SetPinMux( UART_RX_PINMUX, 0U);
-  IOMUXC_SetPinConfig( UART_TX_PINMUX, 0x10B0u);
-  IOMUXC_SetPinConfig( UART_RX_PINMUX, 0x10B0u);
-
-  lpuart_config_t uart_config;
-  LPUART_GetDefaultConfig(&uart_config);
-  uart_config.baudRate_Bps = CFG_BOARD_UART_BAUDRATE;
-  uart_config.enableTx = true;
-  uart_config.enableRx = true;
-  LPUART_Init(UART_PORT, &uart_config, (CLOCK_GetPllFreq(kCLOCK_PllUsb1) / 6U) / (CLOCK_GetDiv(kCLOCK_UartDiv) + 1U));
-
-  //------------- USB0 -------------//
-  // Clock
-  CLOCK_EnableUsbhs0PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-  CLOCK_EnableUsbhs0Clock(kCLOCK_Usb480M, 480000000U);
-
-  USBPHY_Type* usb_phy = USBPHY;
-
-  // Enable PHY support for Low speed device + LS via FS Hub
-  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
-
-  // Enable all power for normal operation
-  usb_phy->PWD = 0;
-
-  // TX Timing
-  uint32_t phytx = usb_phy->TX;
-  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
-  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
-  usb_phy->TX = phytx;
-}
-
-//--------------------------------------------------------------------+
-// USB Interrupt Handler
-//--------------------------------------------------------------------+
-void USB_OTG1_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_HOST
-    tuh_int_handler(0);
-  #endif
-
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_DEVICE
-    tud_int_handler(0);
-  #endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  GPIO_PinWrite(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // active low
-  return BUTTON_STATE_ACTIVE == GPIO_PinRead(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  LPUART_ReadBlocking(UART_PORT, buf, len);
-  return len;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  LPUART_WriteBlocking(UART_PORT, (uint8_t*)buf, len);
-  return len;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler(void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/mimxrt1015_evk/mimxrt1015_evk.c b/hw/bsp/mimxrt1015_evk/mimxrt1015_evk.c
deleted file mode 100644
index 2b1f3cc80..000000000
--- a/hw/bsp/mimxrt1015_evk/mimxrt1015_evk.c
+++ /dev/null
@@ -1,170 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2018, hathach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-#include "fsl_device_registers.h"
-#include "fsl_gpio.h"
-#include "fsl_iomuxc.h"
-#include "fsl_clock.h"
-#include "fsl_lpuart.h"
-
-#include "clock_config.h"
-
-#define LED_PINMUX            IOMUXC_GPIO_SD_B1_01_GPIO3_IO21
-#define LED_PORT              GPIO3
-#define LED_PIN               21
-#define LED_STATE_ON          0
-
-// SW8 button
-#define BUTTON_PINMUX         IOMUXC_GPIO_EMC_09_GPIO2_IO09
-#define BUTTON_PORT           GPIO2
-#define BUTTON_PIN            9
-#define BUTTON_STATE_ACTIVE   0
-
-// UART
-#define UART_PORT             LPUART1
-#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_07_LPUART1_RX
-#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_06_LPUART1_TX
-
-const uint8_t dcd_data[] = { 0x00 };
-
-void board_init(void)
-{
-  // Init clock
-  BOARD_BootClockRUN();
-  SystemCoreClockUpdate();
-
-  // Enable IOCON clock
-  CLOCK_EnableClock(kCLOCK_Iomuxc);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-//  NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  // LED
-  IOMUXC_SetPinMux( LED_PINMUX, 0U);
-  IOMUXC_SetPinConfig( LED_PINMUX, 0x10B0U);
-
-  gpio_pin_config_t led_config = { kGPIO_DigitalOutput, 0, kGPIO_NoIntmode };
-  GPIO_PinInit(LED_PORT, LED_PIN, &led_config);
-  board_led_write(true);
-
-  // Button
-  IOMUXC_SetPinMux( BUTTON_PINMUX, 0U);
-  IOMUXC_SetPinConfig(BUTTON_PINMUX, 0x01B0A0U);
-  gpio_pin_config_t button_config = { kGPIO_DigitalInput, 0, kGPIO_IntRisingEdge, };
-  GPIO_PinInit(BUTTON_PORT, BUTTON_PIN, &button_config);
-
-  // UART
-  IOMUXC_SetPinMux( UART_TX_PINMUX, 0U);
-  IOMUXC_SetPinMux( UART_RX_PINMUX, 0U);
-  IOMUXC_SetPinConfig( UART_TX_PINMUX, 0x10B0u);
-  IOMUXC_SetPinConfig( UART_RX_PINMUX, 0x10B0u);
-
-  lpuart_config_t uart_config;
-  LPUART_GetDefaultConfig(&uart_config);
-  uart_config.baudRate_Bps = CFG_BOARD_UART_BAUDRATE;
-  uart_config.enableTx = true;
-  uart_config.enableRx = true;
-  LPUART_Init(UART_PORT, &uart_config, (CLOCK_GetPllFreq(kCLOCK_PllUsb1) / 6U) / (CLOCK_GetDiv(kCLOCK_UartDiv) + 1U));
-
-  //------------- USB0 -------------//
-  // Clock
-  CLOCK_EnableUsbhs0PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-  CLOCK_EnableUsbhs0Clock(kCLOCK_Usb480M, 480000000U);
-
-  USBPHY_Type* usb_phy = USBPHY;
-
-  // Enable PHY support for Low speed device + LS via FS Hub
-  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
-
-  // Enable all power for normal operation
-  usb_phy->PWD = 0;
-
-  // TX Timing
-  uint32_t phytx = usb_phy->TX;
-  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
-  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
-  usb_phy->TX = phytx;
-}
-
-//--------------------------------------------------------------------+
-// USB Interrupt Handler
-//--------------------------------------------------------------------+
-void USB_OTG1_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_HOST
-    tuh_int_handler(0);
-  #endif
-
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_DEVICE
-    tud_int_handler(0);
-  #endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  GPIO_PinWrite(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // active low
-  return BUTTON_STATE_ACTIVE == GPIO_PinRead(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  LPUART_ReadBlocking(UART_PORT, buf, len);
-  return len;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  LPUART_WriteBlocking(UART_PORT, (uint8_t*)buf, len);
-  return len;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler(void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/mimxrt1020_evk/board.mk b/hw/bsp/mimxrt1020_evk/board.mk
deleted file mode 100644
index 66bcdf89b..000000000
--- a/hw/bsp/mimxrt1020_evk/board.mk
+++ /dev/null
@@ -1,53 +0,0 @@
-CFLAGS += \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -D__ARMVFP__=0 -D__ARMFPV5__=0\
-  -DCPU_MIMXRT1021DAG5A \
-  -DXIP_EXTERNAL_FLASH=1 \
-  -DXIP_BOOT_HEADER_ENABLE=1 \
-  -DCFG_TUSB_MCU=OPT_MCU_MIMXRT10XX
-
-# mcu driver cause following warnings
-CFLAGS += -Wno-error=unused-parameter
-
-MCU_DIR = hw/mcu/nxp/sdk/devices/MIMXRT1021
-
-# All source paths should be relative to the top level.
-LD_FILE = $(MCU_DIR)/gcc/MIMXRT1021xxxxx_flexspi_nor.ld
-
-SRC_C += \
-	$(MCU_DIR)/system_MIMXRT1021.c \
-	$(MCU_DIR)/xip/fsl_flexspi_nor_boot.c \
-	$(MCU_DIR)/project_template/clock_config.c \
-	$(MCU_DIR)/drivers/fsl_clock.c \
-	$(MCU_DIR)/drivers/fsl_gpio.c \
-	$(MCU_DIR)/drivers/fsl_common.c \
-	$(MCU_DIR)/drivers/fsl_lpuart.c
-
-INC += \
-	$(TOP)/hw/bsp/$(BOARD) \
-	$(TOP)/$(MCU_DIR)/../../CMSIS/Include \
-	$(TOP)/$(MCU_DIR) \
-	$(TOP)/$(MCU_DIR)/drivers \
-	$(TOP)/$(MCU_DIR)/project_template \
-
-SRC_S += $(MCU_DIR)/gcc/startup_MIMXRT1021.S
-
-# For TinyUSB port source
-VENDOR = nxp
-CHIP_FAMILY = transdimension
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# For flash-jlink target
-JLINK_DEVICE = MIMXRT1021DAG5A
-
-# For flash-pyocd target
-PYOCD_TARGET = mimxrt1020
-
-# flash using pyocd
-flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1020_evk/mimxrt1020_evk.c b/hw/bsp/mimxrt1020_evk/mimxrt1020_evk.c
deleted file mode 100644
index 273f3a0c9..000000000
--- a/hw/bsp/mimxrt1020_evk/mimxrt1020_evk.c
+++ /dev/null
@@ -1,169 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2018, hathach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-#include "fsl_device_registers.h"
-#include "fsl_gpio.h"
-#include "fsl_iomuxc.h"
-#include "fsl_clock.h"
-#include "fsl_lpuart.h"
-
-#include "clock_config.h"
-
-#define LED_PINMUX            IOMUXC_GPIO_AD_B0_05_GPIO1_IO05
-#define LED_PORT              GPIO1
-#define LED_PIN               5
-#define LED_STATE_ON          0
-
-// SW8 button
-#define BUTTON_PINMUX         IOMUXC_SNVS_WAKEUP_GPIO5_IO00
-#define BUTTON_PORT           GPIO5
-#define BUTTON_PIN            0
-#define BUTTON_STATE_ACTIVE   0
-
-// UART
-#define UART_PORT             LPUART1
-#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_07_LPUART1_RX
-#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_06_LPUART1_TX
-
-const uint8_t dcd_data[] = { 0x00 };
-
-void board_init(void)
-{
-  // Init clock
-  BOARD_BootClockRUN();
-  SystemCoreClockUpdate();
-
-  // Enable IOCON clock
-  CLOCK_EnableClock(kCLOCK_Iomuxc);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-//  NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  // LED
-  IOMUXC_SetPinMux( LED_PINMUX, 0U);
-  IOMUXC_SetPinConfig( LED_PINMUX, 0x10B0U);
-
-  gpio_pin_config_t led_config = { kGPIO_DigitalOutput, 0, kGPIO_NoIntmode };
-  GPIO_PinInit(LED_PORT, LED_PIN, &led_config);
-  board_led_write(true);
-
-  // Button
-  IOMUXC_SetPinMux( BUTTON_PINMUX, 0U);
-  gpio_pin_config_t button_config = { kGPIO_DigitalInput, 0, kGPIO_IntRisingEdge, };
-  GPIO_PinInit(BUTTON_PORT, BUTTON_PIN, &button_config);
-
-  // UART
-  IOMUXC_SetPinMux( UART_TX_PINMUX, 0U);
-  IOMUXC_SetPinMux( UART_RX_PINMUX, 0U);
-  IOMUXC_SetPinConfig( UART_TX_PINMUX, 0x10B0u);
-  IOMUXC_SetPinConfig( UART_RX_PINMUX, 0x10B0u);
-
-  lpuart_config_t uart_config;
-  LPUART_GetDefaultConfig(&uart_config);
-  uart_config.baudRate_Bps = CFG_BOARD_UART_BAUDRATE;
-  uart_config.enableTx = true;
-  uart_config.enableRx = true;
-  LPUART_Init(UART_PORT, &uart_config, (CLOCK_GetPllFreq(kCLOCK_PllUsb1) / 6U) / (CLOCK_GetDiv(kCLOCK_UartDiv) + 1U));
-
-  //------------- USB0 -------------//
-  // Clock
-  CLOCK_EnableUsbhs0PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-  CLOCK_EnableUsbhs0Clock(kCLOCK_Usb480M, 480000000U);
-
-  USBPHY_Type* usb_phy = USBPHY;
-
-  // Enable PHY support for Low speed device + LS via FS Hub
-  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
-
-  // Enable all power for normal operation
-  usb_phy->PWD = 0;
-
-  // TX Timing
-  uint32_t phytx = usb_phy->TX;
-  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
-  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
-  usb_phy->TX = phytx;
-}
-
-//--------------------------------------------------------------------+
-// USB Interrupt Handler
-//--------------------------------------------------------------------+
-void USB_OTG1_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_HOST
-    tuh_int_handler(0);
-  #endif
-
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_DEVICE
-    tud_int_handler(0);
-  #endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  GPIO_PinWrite(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // active low
-  return BUTTON_STATE_ACTIVE == GPIO_PinRead(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  LPUART_ReadBlocking(UART_PORT, buf, len);
-  return len;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  LPUART_WriteBlocking(UART_PORT, (uint8_t*)buf, len);
-  return len;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler(void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/mimxrt1050_evkb/board.mk b/hw/bsp/mimxrt1050_evkb/board.mk
deleted file mode 100644
index 123e2ea82..000000000
--- a/hw/bsp/mimxrt1050_evkb/board.mk
+++ /dev/null
@@ -1,50 +0,0 @@
-CFLAGS += \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -D__ARMVFP__=0 -D__ARMFPV5__=0\
-  -DCPU_MIMXRT1052DVL6B \
-  -DXIP_EXTERNAL_FLASH=1 \
-  -DXIP_BOOT_HEADER_ENABLE=1 \
-  -DCFG_TUSB_MCU=OPT_MCU_MIMXRT10XX
-
-# mcu driver cause following warnings
-CFLAGS += -Wno-error=unused-parameter
-
-MCU_DIR = hw/mcu/nxp/sdk/devices/MIMXRT1052
-
-# All source paths should be relative to the top level.
-LD_FILE = $(MCU_DIR)/gcc/MIMXRT1052xxxxx_flexspi_nor.ld
-
-SRC_C += \
-	$(MCU_DIR)/system_MIMXRT1052.c \
-	$(MCU_DIR)/xip/fsl_flexspi_nor_boot.c \
-	$(MCU_DIR)/project_template/clock_config.c \
-	$(MCU_DIR)/drivers/fsl_clock.c \
-	$(MCU_DIR)/drivers/fsl_gpio.c \
-	$(MCU_DIR)/drivers/fsl_common.c \
-	$(MCU_DIR)/drivers/fsl_lpuart.c
-
-INC += \
-	$(TOP)/hw/bsp/$(BOARD) \
-	$(TOP)/$(MCU_DIR)/../../CMSIS/Include \
-	$(TOP)/$(MCU_DIR) \
-	$(TOP)/$(MCU_DIR)/drivers \
-	$(TOP)/$(MCU_DIR)/project_template \
-
-SRC_S += $(MCU_DIR)/gcc/startup_MIMXRT1052.S
-
-# For TinyUSB port source
-VENDOR = nxp
-CHIP_FAMILY = transdimension
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# For flash-pyocd target
-PYOCD_TARGET = mimxrt1050
-
-# flash using pyocd
-flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1050_evkb/mimxrt1050_evkb.c b/hw/bsp/mimxrt1050_evkb/mimxrt1050_evkb.c
deleted file mode 100644
index 1042bcfe7..000000000
--- a/hw/bsp/mimxrt1050_evkb/mimxrt1050_evkb.c
+++ /dev/null
@@ -1,184 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2018, hathach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-#include "fsl_device_registers.h"
-#include "fsl_gpio.h"
-#include "fsl_iomuxc.h"
-#include "fsl_clock.h"
-#include "fsl_lpuart.h"
-
-#include "clock_config.h"
-
-#define LED_PINMUX            IOMUXC_GPIO_AD_B0_09_GPIO1_IO09
-#define LED_PORT              GPIO1
-#define LED_PIN               9
-#define LED_STATE_ON          0
-
-// SW8 button
-#define BUTTON_PINMUX         IOMUXC_SNVS_WAKEUP_GPIO5_IO00
-#define BUTTON_PORT           GPIO5
-#define BUTTON_PIN            0
-#define BUTTON_STATE_ACTIVE   0
-
-// UART
-#define UART_PORT             LPUART1
-#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_13_LPUART1_RX
-#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_12_LPUART1_TX
-
-const uint8_t dcd_data[] = { 0x00 };
-
-void board_init(void)
-{
-  // Init clock
-  BOARD_BootClockRUN();
-  SystemCoreClockUpdate();
-
-  // Enable IOCON clock
-  CLOCK_EnableClock(kCLOCK_Iomuxc);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-//  NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  // LED
-  IOMUXC_SetPinMux( LED_PINMUX, 0U);
-  IOMUXC_SetPinConfig( LED_PINMUX, 0x10B0U);
-
-  gpio_pin_config_t led_config = { kGPIO_DigitalOutput, 0, kGPIO_NoIntmode };
-  GPIO_PinInit(LED_PORT, LED_PIN, &led_config);
-  board_led_write(true);
-
-  // Button
-  IOMUXC_SetPinMux( BUTTON_PINMUX, 0U);
-  gpio_pin_config_t button_config = { kGPIO_DigitalInput, 0, kGPIO_IntRisingEdge, };
-  GPIO_PinInit(BUTTON_PORT, BUTTON_PIN, &button_config);
-
-  // UART
-  IOMUXC_SetPinMux( UART_TX_PINMUX, 0U);
-  IOMUXC_SetPinMux( UART_RX_PINMUX, 0U);
-  IOMUXC_SetPinConfig( UART_TX_PINMUX, 0x10B0u);
-  IOMUXC_SetPinConfig( UART_RX_PINMUX, 0x10B0u);
-
-  lpuart_config_t uart_config;
-  LPUART_GetDefaultConfig(&uart_config);
-  uart_config.baudRate_Bps = CFG_BOARD_UART_BAUDRATE;
-  uart_config.enableTx = true;
-  uart_config.enableRx = true;
-  LPUART_Init(UART_PORT, &uart_config, (CLOCK_GetPllFreq(kCLOCK_PllUsb1) / 6U) / (CLOCK_GetDiv(kCLOCK_UartDiv) + 1U));
-
-  //------------- USB0 -------------//
-  // Clock
-  CLOCK_EnableUsbhs0PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-  CLOCK_EnableUsbhs0Clock(kCLOCK_Usb480M, 480000000U);
-
-  USBPHY_Type* usb_phy = USBPHY1;
-
-  // Enable PHY support for Low speed device + LS via FS Hub
-  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
-
-  // Enable all power for normal operation
-  usb_phy->PWD = 0;
-
-  // TX Timing
-  uint32_t phytx = usb_phy->TX;
-  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
-  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
-  usb_phy->TX = phytx;
-
-  // USB1
-//  CLOCK_EnableUsbhs1PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-//  CLOCK_EnableUsbhs1Clock(kCLOCK_Usb480M, 480000000U);
-}
-
-//--------------------------------------------------------------------+
-// USB Interrupt Handler
-//--------------------------------------------------------------------+
-void USB_OTG1_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_HOST
-    tuh_int_handler(0);
-  #endif
-
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_DEVICE
-    tud_int_handler(0);
-  #endif
-}
-
-void USB_OTG2_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT1_MODE & OPT_MODE_HOST
-    tuh_int_handler(1);
-  #endif
-
-  #if CFG_TUSB_RHPORT1_MODE & OPT_MODE_DEVICE
-    tud_int_handler(1);
-  #endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  GPIO_PinWrite(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // active low
-  return BUTTON_STATE_ACTIVE == GPIO_PinRead(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  LPUART_ReadBlocking(UART_PORT, buf, len);
-  return len;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  LPUART_WriteBlocking(UART_PORT, (uint8_t*)buf, len);
-  return len;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler(void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/mimxrt1060_evk/board.mk b/hw/bsp/mimxrt1060_evk/board.mk
deleted file mode 100644
index 5c93e1cdf..000000000
--- a/hw/bsp/mimxrt1060_evk/board.mk
+++ /dev/null
@@ -1,53 +0,0 @@
-CFLAGS += \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -D__ARMVFP__=0 -D__ARMFPV5__=0\
-  -DCPU_MIMXRT1062DVL6A \
-  -DXIP_EXTERNAL_FLASH=1 \
-  -DXIP_BOOT_HEADER_ENABLE=1 \
-  -DCFG_TUSB_MCU=OPT_MCU_MIMXRT10XX
-
-# mcu driver cause following warnings
-CFLAGS += -Wno-error=unused-parameter
-
-MCU_DIR = hw/mcu/nxp/sdk/devices/MIMXRT1062
-
-# All source paths should be relative to the top level.
-LD_FILE = $(MCU_DIR)/gcc/MIMXRT1062xxxxx_flexspi_nor.ld
-
-SRC_C += \
-	$(MCU_DIR)/system_MIMXRT1062.c \
-	$(MCU_DIR)/xip/fsl_flexspi_nor_boot.c \
-	$(MCU_DIR)/project_template/clock_config.c \
-	$(MCU_DIR)/drivers/fsl_clock.c \
-	$(MCU_DIR)/drivers/fsl_gpio.c \
-	$(MCU_DIR)/drivers/fsl_common.c \
-	$(MCU_DIR)/drivers/fsl_lpuart.c
-
-INC += \
-	$(TOP)/hw/bsp/$(BOARD) \
-	$(TOP)/$(MCU_DIR)/../../CMSIS/Include \
-	$(TOP)/$(MCU_DIR) \
-	$(TOP)/$(MCU_DIR)/drivers \
-	$(TOP)/$(MCU_DIR)/project_template \
-
-SRC_S += $(MCU_DIR)/gcc/startup_MIMXRT1062.S
-
-# For TinyUSB port source
-VENDOR = nxp
-CHIP_FAMILY = transdimension
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# For flash-jlink target
-JLINK_DEVICE = MIMXRT1062xxx6A
-
-# For flash-pyocd target
-PYOCD_TARGET = mimxrt1060
-
-# flash using pyocd
-flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1064_evk/board.mk b/hw/bsp/mimxrt1064_evk/board.mk
deleted file mode 100644
index f6a277497..000000000
--- a/hw/bsp/mimxrt1064_evk/board.mk
+++ /dev/null
@@ -1,53 +0,0 @@
-CFLAGS += \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -D__ARMVFP__=0 -D__ARMFPV5__=0\
-  -DCPU_MIMXRT1064DVL6A \
-  -DXIP_EXTERNAL_FLASH=1 \
-  -DXIP_BOOT_HEADER_ENABLE=1 \
-  -DCFG_TUSB_MCU=OPT_MCU_MIMXRT10XX
-
-# mcu driver cause following warnings
-CFLAGS += -Wno-error=unused-parameter
-
-MCU_DIR = hw/mcu/nxp/sdk/devices/MIMXRT1064
-
-# All source paths should be relative to the top level.
-LD_FILE = $(MCU_DIR)/gcc/MIMXRT1064xxxxx_flexspi_nor.ld
-
-SRC_C += \
-	$(MCU_DIR)/system_MIMXRT1064.c \
-	$(MCU_DIR)/xip/fsl_flexspi_nor_boot.c \
-	$(MCU_DIR)/project_template/clock_config.c \
-	$(MCU_DIR)/drivers/fsl_clock.c \
-	$(MCU_DIR)/drivers/fsl_gpio.c \
-	$(MCU_DIR)/drivers/fsl_common.c \
-	$(MCU_DIR)/drivers/fsl_lpuart.c
-
-INC += \
-	$(TOP)/hw/bsp/$(BOARD) \
-	$(TOP)/$(MCU_DIR)/../../CMSIS/Include \
-	$(TOP)/$(MCU_DIR) \
-	$(TOP)/$(MCU_DIR)/drivers \
-	$(TOP)/$(MCU_DIR)/project_template \
-
-SRC_S += $(MCU_DIR)/gcc/startup_MIMXRT1064.S
-
-# For TinyUSB port source
-VENDOR = nxp
-CHIP_FAMILY = transdimension
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# For flash-jlink target
-JLINK_DEVICE = MIMXRT1064xxx6A
-
-# For flash-pyocd target
-PYOCD_TARGET = mimxrt1064
-
-# flash using pyocd
-flash: flash-pyocd
diff --git a/hw/bsp/mimxrt1064_evk/mimxrt1064_evk.c b/hw/bsp/mimxrt1064_evk/mimxrt1064_evk.c
deleted file mode 100644
index 1042bcfe7..000000000
--- a/hw/bsp/mimxrt1064_evk/mimxrt1064_evk.c
+++ /dev/null
@@ -1,184 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2018, hathach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-#include "fsl_device_registers.h"
-#include "fsl_gpio.h"
-#include "fsl_iomuxc.h"
-#include "fsl_clock.h"
-#include "fsl_lpuart.h"
-
-#include "clock_config.h"
-
-#define LED_PINMUX            IOMUXC_GPIO_AD_B0_09_GPIO1_IO09
-#define LED_PORT              GPIO1
-#define LED_PIN               9
-#define LED_STATE_ON          0
-
-// SW8 button
-#define BUTTON_PINMUX         IOMUXC_SNVS_WAKEUP_GPIO5_IO00
-#define BUTTON_PORT           GPIO5
-#define BUTTON_PIN            0
-#define BUTTON_STATE_ACTIVE   0
-
-// UART
-#define UART_PORT             LPUART1
-#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_13_LPUART1_RX
-#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_12_LPUART1_TX
-
-const uint8_t dcd_data[] = { 0x00 };
-
-void board_init(void)
-{
-  // Init clock
-  BOARD_BootClockRUN();
-  SystemCoreClockUpdate();
-
-  // Enable IOCON clock
-  CLOCK_EnableClock(kCLOCK_Iomuxc);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-//  NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  // LED
-  IOMUXC_SetPinMux( LED_PINMUX, 0U);
-  IOMUXC_SetPinConfig( LED_PINMUX, 0x10B0U);
-
-  gpio_pin_config_t led_config = { kGPIO_DigitalOutput, 0, kGPIO_NoIntmode };
-  GPIO_PinInit(LED_PORT, LED_PIN, &led_config);
-  board_led_write(true);
-
-  // Button
-  IOMUXC_SetPinMux( BUTTON_PINMUX, 0U);
-  gpio_pin_config_t button_config = { kGPIO_DigitalInput, 0, kGPIO_IntRisingEdge, };
-  GPIO_PinInit(BUTTON_PORT, BUTTON_PIN, &button_config);
-
-  // UART
-  IOMUXC_SetPinMux( UART_TX_PINMUX, 0U);
-  IOMUXC_SetPinMux( UART_RX_PINMUX, 0U);
-  IOMUXC_SetPinConfig( UART_TX_PINMUX, 0x10B0u);
-  IOMUXC_SetPinConfig( UART_RX_PINMUX, 0x10B0u);
-
-  lpuart_config_t uart_config;
-  LPUART_GetDefaultConfig(&uart_config);
-  uart_config.baudRate_Bps = CFG_BOARD_UART_BAUDRATE;
-  uart_config.enableTx = true;
-  uart_config.enableRx = true;
-  LPUART_Init(UART_PORT, &uart_config, (CLOCK_GetPllFreq(kCLOCK_PllUsb1) / 6U) / (CLOCK_GetDiv(kCLOCK_UartDiv) + 1U));
-
-  //------------- USB0 -------------//
-  // Clock
-  CLOCK_EnableUsbhs0PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-  CLOCK_EnableUsbhs0Clock(kCLOCK_Usb480M, 480000000U);
-
-  USBPHY_Type* usb_phy = USBPHY1;
-
-  // Enable PHY support for Low speed device + LS via FS Hub
-  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
-
-  // Enable all power for normal operation
-  usb_phy->PWD = 0;
-
-  // TX Timing
-  uint32_t phytx = usb_phy->TX;
-  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
-  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
-  usb_phy->TX = phytx;
-
-  // USB1
-//  CLOCK_EnableUsbhs1PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-//  CLOCK_EnableUsbhs1Clock(kCLOCK_Usb480M, 480000000U);
-}
-
-//--------------------------------------------------------------------+
-// USB Interrupt Handler
-//--------------------------------------------------------------------+
-void USB_OTG1_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_HOST
-    tuh_int_handler(0);
-  #endif
-
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_DEVICE
-    tud_int_handler(0);
-  #endif
-}
-
-void USB_OTG2_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT1_MODE & OPT_MODE_HOST
-    tuh_int_handler(1);
-  #endif
-
-  #if CFG_TUSB_RHPORT1_MODE & OPT_MODE_DEVICE
-    tud_int_handler(1);
-  #endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  GPIO_PinWrite(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // active low
-  return BUTTON_STATE_ACTIVE == GPIO_PinRead(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  LPUART_ReadBlocking(UART_PORT, buf, len);
-  return len;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  LPUART_WriteBlocking(UART_PORT, (uint8_t*)buf, len);
-  return len;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler(void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/hw/bsp/nrf/boards/adafruit_clue/board.h b/hw/bsp/nrf/boards/adafruit_clue/board.h
new file mode 100644
index 000000000..2c58e8fe8
--- /dev/null
+++ b/hw/bsp/nrf/boards/adafruit_clue/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN               _PINNUM(1, 1)
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            _PINNUM(1, 02)
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/adafruit_clue/board.mk b/hw/bsp/nrf/boards/adafruit_clue/board.mk
new file mode 100644
index 000000000..d8530dc74
--- /dev/null
+++ b/hw/bsp/nrf/boards/adafruit_clue/board.mk
@@ -0,0 +1,10 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
+	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
+
+# flash using adafruit-nrfutil dfu
+flash: $(BUILD)/$(BOARD)-firmware.zip
+	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
+	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/adafruit_clue/nrf52840_s140_v6.ld b/hw/bsp/nrf/boards/adafruit_clue/nrf52840_s140_v6.ld
similarity index 100%
rename from hw/bsp/adafruit_clue/nrf52840_s140_v6.ld
rename to hw/bsp/nrf/boards/adafruit_clue/nrf52840_s140_v6.ld
diff --git a/hw/bsp/arduino_nano33_ble/arduino_nano33_ble.ld b/hw/bsp/nrf/boards/arduino_nano33_ble/arduino_nano33_ble.ld
similarity index 100%
rename from hw/bsp/arduino_nano33_ble/arduino_nano33_ble.ld
rename to hw/bsp/nrf/boards/arduino_nano33_ble/arduino_nano33_ble.ld
diff --git a/hw/bsp/nrf/boards/arduino_nano33_ble/board.h b/hw/bsp/nrf/boards/arduino_nano33_ble/board.h
new file mode 100644
index 000000000..d548e01c3
--- /dev/null
+++ b/hw/bsp/nrf/boards/arduino_nano33_ble/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN               _PINNUM(0, 24)
+#define LED_STATE_ON          0
+
+// Button
+#define BUTTON_PIN            _PINNUM(1, 11) // D2
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           _PINNUM(1, 10)
+#define UART_TX_PIN           _PINNUM(1, 3)
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/arduino_nano33_ble/board.mk b/hw/bsp/nrf/boards/arduino_nano33_ble/board.mk
new file mode 100644
index 000000000..7d8e9bce1
--- /dev/null
+++ b/hw/bsp/nrf/boards/arduino_nano33_ble/board.mk
@@ -0,0 +1,13 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# flash using bossac (as part of Nano33 BSP tools)
+# can be found in arduino15/packages/arduino/tools/bossac/
+# Add it to your PATH or change BOSSAC variable to match your installation
+BOSSAC = bossac
+
+flash: $(BUILD)/$(BOARD)-firmware.bin
+	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
+	$(BOSSAC) --port=$(SERIAL) -U -i -e -w $^ -R
diff --git a/hw/bsp/nrf/boards/circuitplayground_bluefruit/board.h b/hw/bsp/nrf/boards/circuitplayground_bluefruit/board.h
new file mode 100644
index 000000000..a86c9dc7f
--- /dev/null
+++ b/hw/bsp/nrf/boards/circuitplayground_bluefruit/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN         _PINNUM(1, 14)
+#define LED_STATE_ON    1
+
+// Button
+#define BUTTON_PIN      _PINNUM(1, 15)
+#define BUTTON_STATE_ACTIVE   1
+
+// UART
+#define UART_RX_PIN     30
+#define UART_TX_PIN     14
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/circuitplayground_bluefruit/board.mk b/hw/bsp/nrf/boards/circuitplayground_bluefruit/board.mk
new file mode 100644
index 000000000..d8530dc74
--- /dev/null
+++ b/hw/bsp/nrf/boards/circuitplayground_bluefruit/board.mk
@@ -0,0 +1,10 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
+	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
+
+# flash using adafruit-nrfutil dfu
+flash: $(BUILD)/$(BOARD)-firmware.zip
+	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
+	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/circuitplayground_bluefruit/nrf52840_s140_v6.ld b/hw/bsp/nrf/boards/circuitplayground_bluefruit/nrf52840_s140_v6.ld
similarity index 100%
rename from hw/bsp/circuitplayground_bluefruit/nrf52840_s140_v6.ld
rename to hw/bsp/nrf/boards/circuitplayground_bluefruit/nrf52840_s140_v6.ld
diff --git a/hw/bsp/nrf/boards/feather_nrf52840_express/board.h b/hw/bsp/nrf/boards/feather_nrf52840_express/board.h
new file mode 100644
index 000000000..3208a948a
--- /dev/null
+++ b/hw/bsp/nrf/boards/feather_nrf52840_express/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN         _PINNUM(1, 15)
+#define LED_STATE_ON    1
+
+// Button
+#define BUTTON_PIN      _PINNUM(1, 02)
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN     24
+#define UART_TX_PIN     25
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/feather_nrf52840_express/board.mk b/hw/bsp/nrf/boards/feather_nrf52840_express/board.mk
new file mode 100644
index 000000000..d8530dc74
--- /dev/null
+++ b/hw/bsp/nrf/boards/feather_nrf52840_express/board.mk
@@ -0,0 +1,10 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
+	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
+
+# flash using adafruit-nrfutil dfu
+flash: $(BUILD)/$(BOARD)-firmware.zip
+	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
+	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/feather_nrf52840_express/nrf52840_s140_v6.ld b/hw/bsp/nrf/boards/feather_nrf52840_express/nrf52840_s140_v6.ld
similarity index 100%
rename from hw/bsp/feather_nrf52840_express/nrf52840_s140_v6.ld
rename to hw/bsp/nrf/boards/feather_nrf52840_express/nrf52840_s140_v6.ld
diff --git a/hw/bsp/nrf/boards/feather_nrf52840_sense/board.h b/hw/bsp/nrf/boards/feather_nrf52840_sense/board.h
new file mode 100644
index 000000000..ece6e34cb
--- /dev/null
+++ b/hw/bsp/nrf/boards/feather_nrf52840_sense/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN         _PINNUM(1, 9)
+#define LED_STATE_ON    1
+
+// Button
+#define BUTTON_PIN      _PINNUM(1, 02)
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN     24
+#define UART_TX_PIN     25
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/feather_nrf52840_sense/board.mk b/hw/bsp/nrf/boards/feather_nrf52840_sense/board.mk
new file mode 100644
index 000000000..d8530dc74
--- /dev/null
+++ b/hw/bsp/nrf/boards/feather_nrf52840_sense/board.mk
@@ -0,0 +1,10 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
+	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
+
+# flash using adafruit-nrfutil dfu
+flash: $(BUILD)/$(BOARD)-firmware.zip
+	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
+	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/feather_nrf52840_sense/nrf52840_s140_v6.ld b/hw/bsp/nrf/boards/feather_nrf52840_sense/nrf52840_s140_v6.ld
similarity index 100%
rename from hw/bsp/feather_nrf52840_sense/nrf52840_s140_v6.ld
rename to hw/bsp/nrf/boards/feather_nrf52840_sense/nrf52840_s140_v6.ld
diff --git a/hw/bsp/nrf/boards/itsybitsy_nrf52840/board.h b/hw/bsp/nrf/boards/itsybitsy_nrf52840/board.h
new file mode 100644
index 000000000..132173a80
--- /dev/null
+++ b/hw/bsp/nrf/boards/itsybitsy_nrf52840/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN         _PINNUM(0, 6)
+#define LED_STATE_ON    1
+
+// Button
+#define BUTTON_PIN      _PINNUM(0, 29)
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN     25
+#define UART_TX_PIN     24
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/itsybitsy_nrf52840/board.mk b/hw/bsp/nrf/boards/itsybitsy_nrf52840/board.mk
new file mode 100644
index 000000000..d8530dc74
--- /dev/null
+++ b/hw/bsp/nrf/boards/itsybitsy_nrf52840/board.mk
@@ -0,0 +1,10 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
+	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
+
+# flash using adafruit-nrfutil dfu
+flash: $(BUILD)/$(BOARD)-firmware.zip
+	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
+	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/itsybitsy_nrf52840/nrf52840_s140_v6.ld b/hw/bsp/nrf/boards/itsybitsy_nrf52840/nrf52840_s140_v6.ld
similarity index 100%
rename from hw/bsp/itsybitsy_nrf52840/nrf52840_s140_v6.ld
rename to hw/bsp/nrf/boards/itsybitsy_nrf52840/nrf52840_s140_v6.ld
diff --git a/hw/bsp/nrf/boards/nrf52840_mdk_dongle/board.h b/hw/bsp/nrf/boards/nrf52840_mdk_dongle/board.h
new file mode 100644
index 000000000..01dd1f24f
--- /dev/null
+++ b/hw/bsp/nrf/boards/nrf52840_mdk_dongle/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN               _PINNUM(0, 23)
+#define LED_STATE_ON          0
+
+// Button
+#define BUTTON_PIN            _PINNUM(0, 18)
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           2
+#define UART_TX_PIN           3
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/nrf52840_mdk_dongle/board.mk b/hw/bsp/nrf/boards/nrf52840_mdk_dongle/board.mk
new file mode 100644
index 000000000..a184fa892
--- /dev/null
+++ b/hw/bsp/nrf/boards/nrf52840_mdk_dongle/board.mk
@@ -0,0 +1,15 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# flash using Nordic nrfutil (pip3 install nrfutil)
+# 	make BOARD=nrf52840_mdk_dongle SERIAL=/dev/ttyACM0 all flash
+NRFUTIL = nrfutil
+
+$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
+	$(NRFUTIL) pkg generate --hw-version 52 --sd-req 0x0000 --debug-mode --application $^ $@
+
+flash: $(BUILD)/$(BOARD)-firmware.zip
+	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
+	$(NRFUTIL) dfu usb-serial --package $^ -p $(SERIAL) -b 115200
\ No newline at end of file
diff --git a/hw/bsp/nrf52840_mdk_dongle/nrf52840_mdk_dongle.ld b/hw/bsp/nrf/boards/nrf52840_mdk_dongle/nrf52840_mdk_dongle.ld
similarity index 100%
rename from hw/bsp/nrf52840_mdk_dongle/nrf52840_mdk_dongle.ld
rename to hw/bsp/nrf/boards/nrf52840_mdk_dongle/nrf52840_mdk_dongle.ld
diff --git a/hw/bsp/mimxrt1020_evk/board.h b/hw/bsp/nrf/boards/pca10056/board.h
similarity index 78%
rename from hw/bsp/mimxrt1020_evk/board.h
rename to hw/bsp/nrf/boards/pca10056/board.h
index f1bd06369..ab12d21aa 100644
--- a/hw/bsp/mimxrt1020_evk/board.h
+++ b/hw/bsp/nrf/boards/pca10056/board.h
@@ -1,7 +1,7 @@
 /* 
  * The MIT License (MIT)
  *
- * Copyright (c) 2019, Ha Thach (tinyusb.org)
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,11 +24,27 @@
  * This file is part of the TinyUSB stack.
  */
 
-
 #ifndef BOARD_H_
 #define BOARD_H_
 
-// required since iMX RT10xx SDK include this file for board size
-#define BOARD_FLASH_SIZE (0x800000U)
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               13
+#define LED_STATE_ON          0
+
+// Button
+#define BUTTON_PIN            11
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           8
+#define UART_TX_PIN           6
+
+#ifdef __cplusplus
+ }
+#endif
 
 #endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/pca10056/board.mk b/hw/bsp/nrf/boards/pca10056/board.mk
new file mode 100644
index 000000000..be2ed3314
--- /dev/null
+++ b/hw/bsp/nrf/boards/pca10056/board.mk
@@ -0,0 +1,7 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+LD_FILE = hw/mcu/nordic/nrfx/mdk/nrf52840_xxaa.ld
+
+# flash using jlink
+flash: flash-jlink
diff --git a/hw/bsp/nrf/boards/pca10059/board.h b/hw/bsp/nrf/boards/pca10059/board.h
new file mode 100644
index 000000000..0810be648
--- /dev/null
+++ b/hw/bsp/nrf/boards/pca10059/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN               8
+#define LED_STATE_ON          0
+
+// Button
+#define BUTTON_PIN            _PINNUM(1, 6)
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           8
+#define UART_TX_PIN           6
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/pca10059/board.mk b/hw/bsp/nrf/boards/pca10059/board.mk
new file mode 100644
index 000000000..25609f2fa
--- /dev/null
+++ b/hw/bsp/nrf/boards/pca10059/board.mk
@@ -0,0 +1,15 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# flash using Nordic nrfutil (pip2 install nrfutil)
+# 	make BOARD=pca10059 SERIAL=/dev/ttyACM0 all flash
+NRFUTIL = nrfutil
+
+$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
+	$(NRFUTIL) pkg generate --hw-version 52 --sd-req 0x0000 --debug-mode --application $^ $@
+
+flash: $(BUILD)/$(BOARD)-firmware.zip
+	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
+	$(NRFUTIL) dfu usb-serial --package $^ -p $(SERIAL) -b 115200
diff --git a/hw/bsp/pca10059/pca10059.ld b/hw/bsp/nrf/boards/pca10059/pca10059.ld
similarity index 100%
rename from hw/bsp/pca10059/pca10059.ld
rename to hw/bsp/nrf/boards/pca10059/pca10059.ld
diff --git a/hw/bsp/nrf/boards/pca10100/board.h b/hw/bsp/nrf/boards/pca10100/board.h
new file mode 100644
index 000000000..881133035
--- /dev/null
+++ b/hw/bsp/nrf/boards/pca10100/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN               13
+#define LED_STATE_ON          0
+
+// Button
+#define BUTTON_PIN            11
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           8
+#define UART_TX_PIN           6
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/pca10100/board.mk b/hw/bsp/nrf/boards/pca10100/board.mk
new file mode 100644
index 000000000..5fba269b7
--- /dev/null
+++ b/hw/bsp/nrf/boards/pca10100/board.mk
@@ -0,0 +1,7 @@
+MCU_VARIANT = nrf52833
+CFLAGS += -DNRF52833_XXAA
+
+LD_FILE = hw/mcu/nordic/nrfx/mdk/nrf52833_xxaa.ld
+
+# flash using jlink
+flash: flash-jlink
diff --git a/hw/bsp/nrf/boards/raytac_mdbt50q_rx/board.h b/hw/bsp/nrf/boards/raytac_mdbt50q_rx/board.h
new file mode 100644
index 000000000..dcf829d9c
--- /dev/null
+++ b/hw/bsp/nrf/boards/raytac_mdbt50q_rx/board.h
@@ -0,0 +1,52 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+// LED
+#define LED_PIN               _PINNUM(1, 13)
+#define LED_STATE_ON          0
+
+// Button
+#define BUTTON_PIN            _PINNUM(0, 15)
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN     25
+#define UART_TX_PIN     24
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/nrf/boards/raytac_mdbt50q_rx/board.mk b/hw/bsp/nrf/boards/raytac_mdbt50q_rx/board.mk
new file mode 100644
index 000000000..be2ed3314
--- /dev/null
+++ b/hw/bsp/nrf/boards/raytac_mdbt50q_rx/board.mk
@@ -0,0 +1,7 @@
+MCU_VARIANT = nrf52840
+CFLAGS += -DNRF52840_XXAA
+
+LD_FILE = hw/mcu/nordic/nrfx/mdk/nrf52840_xxaa.ld
+
+# flash using jlink
+flash: flash-jlink
diff --git a/hw/bsp/pca10056/pca10056.c b/hw/bsp/nrf/family.c
similarity index 94%
rename from hw/bsp/pca10056/pca10056.c
rename to hw/bsp/nrf/family.c
index 30df50124..48f560a6f 100644
--- a/hw/bsp/pca10056/pca10056.c
+++ b/hw/bsp/nrf/family.c
@@ -26,6 +26,8 @@
 
 #include "bsp/board.h"
 
+#include "board.h"
+
 #include "nrfx.h"
 #include "nrfx/hal/nrf_gpio.h"
 #include "nrfx/drivers/include/nrfx_power.h"
@@ -47,17 +49,8 @@ void USBD_IRQHandler(void)
 /*------------------------------------------------------------------*/
 /* MACRO TYPEDEF CONSTANT ENUM
  *------------------------------------------------------------------*/
-#define LED_PIN               13
-#define LED_STATE_ON          0
-
-#define BUTTON_PIN            11
-#define BUTTON_STATE_ACTIVE   0
-
-#define UART_RX_PIN           8
-#define UART_TX_PIN           6
 
 static nrfx_uarte_t _uart_id = NRFX_UARTE_INSTANCE(0);
-//static void uart_handler(nrfx_uart_event_t const * p_event, void* p_context);
 
 // tinyusb function that handles power event (detected, ready, removed)
 // We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
@@ -100,6 +93,7 @@ void board_init(void)
 
   nrfx_uarte_init(&_uart_id, &uart_cfg, NULL); //uart_handler);
 
+  //------------- USB -------------//
 #if TUSB_OPT_DEVICE_ENABLED
   // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
   // 2 is highest for application
@@ -155,11 +149,6 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == nrf_gpio_pin_read(BUTTON_PIN);
 }
 
-//static void uart_handler(nrfx_uart_event_t const * p_event, void* p_context)
-//{
-//
-//}
-
 int board_uart_read(uint8_t* buf, int len)
 {
   (void) buf; (void) len;
diff --git a/hw/bsp/feather_nrf52840_express/board.mk b/hw/bsp/nrf/family.mk
similarity index 59%
rename from hw/bsp/feather_nrf52840_express/board.mk
rename to hw/bsp/nrf/family.mk
index 059e55dff..7d8f10956 100644
--- a/hw/bsp/feather_nrf52840_express/board.mk
+++ b/hw/bsp/nrf/family.mk
@@ -1,3 +1,5 @@
+include $(TOP)/$(BOARD_PATH)/board.mk
+
 CFLAGS += \
   -flto \
   -mthumb \
@@ -6,7 +8,6 @@ CFLAGS += \
   -mfloat-abi=hard \
   -mfpu=fpv4-sp-d16 \
   -DCFG_TUSB_MCU=OPT_MCU_NRF5X \
-  -DNRF52840_XXAA \
   -DCONFIG_GPIO_AS_PINRESET
 
 # suppress warning caused by vendor mcu driver
@@ -15,26 +16,27 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
 ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
+  ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
+  CFLAGS += -Wno-error=cast-function-type
+  endif
 else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
+  ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
+  CFLAGS += -Wno-error=cast-function-type
+  endif
 endif
 
 # All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/nrf52840_s140_v6.ld
+LD_FILE ?= hw/bsp/nrf/boards/$(BOARD)/nrf52840_s140_v6.ld
 
 LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
 
 SRC_C += \
   hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
   hw/mcu/nordic/nrfx/drivers/src/nrfx_uarte.c \
-  hw/mcu/nordic/nrfx/mdk/system_nrf52840.c
+  hw/mcu/nordic/nrfx/mdk/system_$(MCU_VARIANT).c
 
 INC += \
+  $(TOP)/$(BOARD_PATH) \
   $(TOP)/lib/CMSIS_4/CMSIS/Include \
   $(TOP)/hw/mcu/nordic \
   $(TOP)/hw/mcu/nordic/nrfx \
@@ -43,7 +45,7 @@ INC += \
   $(TOP)/hw/mcu/nordic/nrfx/drivers/include \
   $(TOP)/hw/mcu/nordic/nrfx/drivers/src \
 
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
+SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_$(MCU_VARIANT).S
 
 ASFLAGS += -D__HEAP_SIZE=0
 
@@ -55,15 +57,7 @@ CHIP_FAMILY = nrf5x
 FREERTOS_PORT = ARM_CM4F
 
 # For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
+JLINK_DEVICE = $(MCU_VARIANT)_xxaa
 
 # For uf2 conversion
 UF2_FAMILY = 0xADA52840
-
-$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
-	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --sd-req 0xFFFE --application $^ $@
-	
-# flash using adafruit-nrfutil dfu
-flash: $(BUILD)/$(BOARD)-firmware.zip
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	adafruit-nrfutil --verbose dfu serial --package $^ -p $(SERIAL) -b 115200 --singlebank --touch 1200
diff --git a/hw/bsp/nrf52840_mdk_dongle/board.mk b/hw/bsp/nrf52840_mdk_dongle/board.mk
deleted file mode 100644
index 3c44e402c..000000000
--- a/hw/bsp/nrf52840_mdk_dongle/board.mk
+++ /dev/null
@@ -1,67 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DNRF52840_XXAA \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/$(BOARD).ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-	hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-	hw/mcu/nordic/nrfx/mdk/system_nrf52840.c \
-
-INC += \
-	$(TOP)/lib/CMSIS_4/CMSIS/Include \
-	$(TOP)/hw/mcu/nordic \
-	$(TOP)/hw/mcu/nordic/nrfx \
-	$(TOP)/hw/mcu/nordic/nrfx/mdk \
-	$(TOP)/hw/mcu/nordic/nrfx/hal \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# flash using Nordic nrfutil (pip2 install nrfutil)
-# 	make BOARD=nrf52840_mdk_dongle SERIAL=/dev/ttyACM0 all flash
-NRFUTIL = nrfutil
-
-$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
-	$(NRFUTIL) pkg generate --hw-version 52 --sd-req 0x0000 --debug-mode --application $^ $@
-
-flash: $(BUILD)/$(BOARD)-firmware.zip
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	$(NRFUTIL) dfu usb-serial --package $^ -p $(SERIAL) -b 115200
diff --git a/hw/bsp/nrf52840_mdk_dongle/nrf52840_mdk_dongle.c b/hw/bsp/nrf52840_mdk_dongle/nrf52840_mdk_dongle.c
deleted file mode 100644
index 870a290dd..000000000
--- a/hw/bsp/nrf52840_mdk_dongle/nrf52840_mdk_dongle.c
+++ /dev/null
@@ -1,198 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define LED_PIN               23
-#define LED_STATE_ON          0
-
-// Button 1
-#define BUTTON_PIN            18
-#define BUTTON_STATE_ACTIVE   0
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-#endif
-
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == nrf_gpio_pin_read(BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/pca10056/board.mk b/hw/bsp/pca10056/board.mk
deleted file mode 100644
index b8691525b..000000000
--- a/hw/bsp/pca10056/board.mk
+++ /dev/null
@@ -1,61 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DNRF52840_XXAA \
-  -DCONFIG_GPIO_AS_PINRESET \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/mcu/nordic/nrfx/mdk/nrf52840_xxaa.ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-	hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-	hw/mcu/nordic/nrfx/drivers/src/nrfx_uarte.c \
-	hw/mcu/nordic/nrfx/mdk/system_nrf52840.c
-
-INC += \
-	$(TOP)/lib/CMSIS_4/CMSIS/Include \
-	$(TOP)/hw/mcu/nordic \
-	$(TOP)/hw/mcu/nordic/nrfx \
-	$(TOP)/hw/mcu/nordic/nrfx/mdk \
-	$(TOP)/hw/mcu/nordic/nrfx/hal \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# flash using jlink
-flash: flash-jlink
diff --git a/hw/bsp/pca10059/board.mk b/hw/bsp/pca10059/board.mk
deleted file mode 100644
index 178f09474..000000000
--- a/hw/bsp/pca10059/board.mk
+++ /dev/null
@@ -1,68 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DNRF52840_XXAA \
-  -DCONFIG_GPIO_AS_PINRESET \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/$(BOARD).ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-	hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-	hw/mcu/nordic/nrfx/mdk/system_nrf52840.c \
-
-INC += \
-	$(TOP)/lib/CMSIS_4/CMSIS/Include \
-	$(TOP)/hw/mcu/nordic \
-	$(TOP)/hw/mcu/nordic/nrfx \
-	$(TOP)/hw/mcu/nordic/nrfx/mdk \
-	$(TOP)/hw/mcu/nordic/nrfx/hal \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# flash using Nordic nrfutil (pip2 install nrfutil)
-# 	make BOARD=pca10059 SERIAL=/dev/ttyACM0 all flash
-NRFUTIL = nrfutil
-
-$(BUILD)/$(BOARD)-firmware.zip: $(BUILD)/$(BOARD)-firmware.hex
-	$(NRFUTIL) pkg generate --hw-version 52 --sd-req 0x0000 --debug-mode --application $^ $@
-
-flash: $(BUILD)/$(BOARD)-firmware.zip
-	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
-	$(NRFUTIL) dfu usb-serial --package $^ -p $(SERIAL) -b 115200
diff --git a/hw/bsp/pca10059/pca10059.c b/hw/bsp/pca10059/pca10059.c
deleted file mode 100644
index 2a2a45eb2..000000000
--- a/hw/bsp/pca10059/pca10059.c
+++ /dev/null
@@ -1,196 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define LED_PIN               8
-#define LED_STATE_ON          0
-
-// Button 1
-#define BUTTON_PIN            (32+6) // P1.06
-#define BUTTON_STATE_ACTIVE   0
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == nrf_gpio_pin_read(BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/pca10100/board.mk b/hw/bsp/pca10100/board.mk
deleted file mode 100644
index 8ada94ba0..000000000
--- a/hw/bsp/pca10100/board.mk
+++ /dev/null
@@ -1,61 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DNRF52833_XXAA \
-  -DCONFIG_GPIO_AS_PINRESET \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/mcu/nordic/nrfx/mdk/nrf52833_xxaa.ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-	hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-	hw/mcu/nordic/nrfx/drivers/src/nrfx_uarte.c \
-	hw/mcu/nordic/nrfx/mdk/system_nrf52833.c \
-
-INC += \
-	$(TOP)/lib/CMSIS_4/CMSIS/Include \
-	$(TOP)/hw/mcu/nordic \
-	$(TOP)/hw/mcu/nordic/nrfx \
-	$(TOP)/hw/mcu/nordic/nrfx/mdk \
-	$(TOP)/hw/mcu/nordic/nrfx/hal \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52833.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52833_XXAA
-
-# flash using jlink
-flash: flash-jlink
diff --git a/hw/bsp/pca10100/pca10100.c b/hw/bsp/pca10100/pca10100.c
deleted file mode 100644
index 30df50124..000000000
--- a/hw/bsp/pca10100/pca10100.c
+++ /dev/null
@@ -1,229 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-#include "nrfx/drivers/include/nrfx_uarte.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define LED_PIN               13
-#define LED_STATE_ON          0
-
-#define BUTTON_PIN            11
-#define BUTTON_STATE_ACTIVE   0
-
-#define UART_RX_PIN           8
-#define UART_TX_PIN           6
-
-static nrfx_uarte_t _uart_id = NRFX_UARTE_INSTANCE(0);
-//static void uart_handler(nrfx_uart_event_t const * p_event, void* p_context);
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // stop LF clock just in case we jump from application without reset
-  NRF_CLOCK->TASKS_LFCLKSTOP = 1UL;
-
-  // Use Internal OSC to compatible with all boards
-  NRF_CLOCK->LFCLKSRC = CLOCK_LFCLKSRC_SRC_RC;
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-
-  // UART
-  nrfx_uarte_config_t uart_cfg =
-  {
-    .pseltxd   = UART_TX_PIN,
-    .pselrxd   = UART_RX_PIN,
-    .pselcts   = NRF_UARTE_PSEL_DISCONNECTED,
-    .pselrts   = NRF_UARTE_PSEL_DISCONNECTED,
-    .p_context = NULL,
-    .baudrate  = NRF_UARTE_BAUDRATE_115200, // CFG_BOARD_UART_BAUDRATE
-    .interrupt_priority = 7,
-    .hal_cfg = {
-      .hwfc      = NRF_UARTE_HWFC_DISABLED,
-      .parity    = NRF_UARTE_PARITY_EXCLUDED,
-    }
-  };
-
-  nrfx_uarte_init(&_uart_id, &uart_cfg, NULL); //uart_handler);
-
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    // cause cast-function-type warning
-    const nrfx_power_usbevt_config_t config = { .handler = ((nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event) };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == nrf_gpio_pin_read(BUTTON_PIN);
-}
-
-//static void uart_handler(nrfx_uart_event_t const * p_event, void* p_context)
-//{
-//
-//}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-//  return NRFX_SUCCESS == nrfx_uart_rx(&_uart_id, buf, (size_t) len) ? len : 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  return (NRFX_SUCCESS == nrfx_uarte_tx(&_uart_id, (uint8_t const*) buf, (size_t) len)) ? len : 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/pyboardv11/board.mk b/hw/bsp/pyboardv11/board.mk
deleted file mode 100644
index a8fc2ca1e..000000000
--- a/hw/bsp/pyboardv11/board.mk
+++ /dev/null
@@ -1,46 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F405xx \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F4
-
-ST_FAMILY = f4
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F405RGTx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = stm32f405rg
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/pyboardv11/pyboardv11.c b/hw/bsp/pyboardv11/pyboardv11.c
deleted file mode 100644
index 5c910484d..000000000
--- a/hw/bsp/pyboardv11/pyboardv11.c
+++ /dev/null
@@ -1,232 +0,0 @@
-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f4xx.h"
-#include "stm32f4xx_hal_conf.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-// Blue LED is chosen because the other LEDs are connected to ST-LINK lines.
-#define LED_PORT              GPIOB
-#define LED_PIN               GPIO_PIN_4
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOB
-#define BUTTON_PIN            GPIO_PIN_3
-#define BUTTON_STATE_ACTIVE   1
-
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-
-  __HAL_RCC_GPIOB_CLK_ENABLE();  // LED, Button
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 168000000
-  *            HCLK(Hz)                       = 168000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 12000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 336
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 7
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 5
-  * @param  None
-  * @retval None
-  */
-static void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 336;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 7;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
-     clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
-}
-
-void board_init(void)
-{
-#if CFG_TUSB_OS  == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  //NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  SystemClock_Config();
-
-  // Notify runtime of frequency change.
-  SystemCoreClockUpdate();
-
-  all_rcc_clk_enable();
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  board_led_write(false);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  // USB Pin Init
-  // PA9- VUSB, PA10- ID, PA11- DM, PA12- DP
-
-  /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* This for ID line debug */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  // Enable USB OTG clock
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/raytac_mdbt50q_rx/board.mk b/hw/bsp/raytac_mdbt50q_rx/board.mk
deleted file mode 100644
index 2c29acfa6..000000000
--- a/hw/bsp/raytac_mdbt50q_rx/board.mk
+++ /dev/null
@@ -1,59 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -DNRF52840_XXAA \
-  -DCFG_TUSB_MCU=OPT_MCU_NRF5X
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
-
-# due to tusb_hal_nrf_power_event
-GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(CMDEXE),1)
-ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-else
-ifeq ($(shell expr $(GCCVERSION) \>= 8), 1)
-CFLAGS += -Wno-error=cast-function-type
-endif
-endif
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/mcu/nordic/nrfx/mdk/nrf52840_xxaa.ld
-
-LDFLAGS += -L$(TOP)/hw/mcu/nordic/nrfx/mdk
-
-SRC_C += \
-	hw/mcu/nordic/nrfx/drivers/src/nrfx_power.c \
-	hw/mcu/nordic/nrfx/mdk/system_nrf52840.c \
-
-INC += \
-	$(TOP)/lib/CMSIS_4/CMSIS/Include \
-	$(TOP)/hw/mcu/nordic \
-	$(TOP)/hw/mcu/nordic/nrfx \
-	$(TOP)/hw/mcu/nordic/nrfx/mdk \
-	$(TOP)/hw/mcu/nordic/nrfx/hal \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/include \
-	$(TOP)/hw/mcu/nordic/nrfx/drivers/src \
-
-SRC_S += hw/mcu/nordic/nrfx/mdk/gcc_startup_nrf52840.S
-
-ASFLAGS += -D__HEAP_SIZE=0
-
-# For TinyUSB port source
-VENDOR = nordic
-CHIP_FAMILY = nrf5x
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = nRF52840_xxAA
-
-# flash using jlink
-flash: flash-jlink
diff --git a/hw/bsp/raytac_mdbt50q_rx/raytac_mdbt50q_rx.c b/hw/bsp/raytac_mdbt50q_rx/raytac_mdbt50q_rx.c
deleted file mode 100644
index 97f3cbf05..000000000
--- a/hw/bsp/raytac_mdbt50q_rx/raytac_mdbt50q_rx.c
+++ /dev/null
@@ -1,198 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "bsp/board.h"
-
-#include "nrfx.h"
-#include "nrfx/hal/nrf_gpio.h"
-#include "nrfx/drivers/include/nrfx_power.h"
-
-#ifdef SOFTDEVICE_PRESENT
-#include "nrf_sdm.h"
-#include "nrf_soc.h"
-#endif
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USBD_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define LED_PIN               (32+13) // P1.13
-#define LED_STATE_ON          0
-
-// Button 1
-#define BUTTON_PIN            15  // P0.15
-#define BUTTON_STATE_ACTIVE   0
-
-// tinyusb function that handles power event (detected, ready, removed)
-// We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
-extern void tusb_hal_nrf_power_event(uint32_t event);
-
-void board_init(void)
-{
-  // Config clock source: XTAL or RC in sdk_config.h
-  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
-  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
-
-  // LED
-  nrf_gpio_cfg_output(LED_PIN);
-  board_led_write(false);
-
-  // Button
-  nrf_gpio_cfg_input(BUTTON_PIN, NRF_GPIO_PIN_PULLUP);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock/1000);
-#endif
-
-#if TUSB_OPT_DEVICE_ENABLED
-  // Priorities 0, 1, 4 (nRF52) are reserved for SoftDevice
-  // 2 is highest for application
-  NVIC_SetPriority(USBD_IRQn, 2);
-
-  // USB power may already be ready at this time -> no event generated
-  // We need to invoke the handler based on the status initially
-  uint32_t usb_reg;
-
-#ifdef SOFTDEVICE_PRESENT
-  uint8_t sd_en = false;
-  sd_softdevice_is_enabled(&sd_en);
-
-  if ( sd_en ) {
-    sd_power_usbdetected_enable(true);
-    sd_power_usbpwrrdy_enable(true);
-    sd_power_usbremoved_enable(true);
-
-    sd_power_usbregstatus_get(&usb_reg);
-  }else
-#endif
-  {
-    // Power module init
-    const nrfx_power_config_t pwr_cfg = { 0 };
-    nrfx_power_init(&pwr_cfg);
-
-    // Register tusb function as USB power handler
-    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-    nrfx_power_usbevt_init(&config);
-
-    nrfx_power_usbevt_enable();
-
-    usb_reg = NRF_POWER->USBREGSTATUS;
-  }
-
-  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk  ) tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  nrf_gpio_pin_write(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == nrf_gpio_pin_read(BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-#ifdef SOFTDEVICE_PRESENT
-// process SOC event from SD
-uint32_t proc_soc(void)
-{
-  uint32_t soc_evt;
-  uint32_t err = sd_evt_get(&soc_evt);
-
-  if (NRF_SUCCESS == err)
-  {
-    /*------------- usb power event handler -------------*/
-    int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
-                     (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
-                     (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
-
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
-  }
-
-  return err;
-}
-
-uint32_t proc_ble(void)
-{
-  // do nothing with ble
-  return NRF_ERROR_NOT_FOUND;
-}
-
-void SD_EVT_IRQHandler(void)
-{
-  // process BLE and SOC until there is no more events
-  while( (NRF_ERROR_NOT_FOUND != proc_ble()) || (NRF_ERROR_NOT_FOUND != proc_soc()) )
-  {
-
-  }
-}
-
-void nrf_error_cb(uint32_t id, uint32_t pc, uint32_t info)
-{
-  (void) id;
-  (void) pc;
-  (void) info;
-}
-#endif
diff --git a/hw/bsp/samd21/boards/atsamd21_xpro/board.h b/hw/bsp/samd21/boards/atsamd21_xpro/board.h
new file mode 100644
index 000000000..a3e03997c
--- /dev/null
+++ b/hw/bsp/samd21/boards/atsamd21_xpro/board.h
@@ -0,0 +1,50 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               (32 + 30) // PB30
+#define LED_STATE_ON          0
+
+// Button
+#define BUTTON_PIN            (0  + 15) // PA15
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/samd21/boards/atsamd21_xpro/board.mk b/hw/bsp/samd21/boards/atsamd21_xpro/board.mk
new file mode 100644
index 000000000..5cd82735c
--- /dev/null
+++ b/hw/bsp/samd21/boards/atsamd21_xpro/board.mk
@@ -0,0 +1,10 @@
+CFLAGS += -D__SAMD21J18A__
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/samd21j18a_flash.ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD21J18
+
+# flash using jlink
+flash: flash-jlink
diff --git a/hw/bsp/atsamd21_xpro/samd21j18a_flash.ld b/hw/bsp/samd21/boards/atsamd21_xpro/samd21j18a_flash.ld
similarity index 100%
rename from hw/bsp/atsamd21_xpro/samd21j18a_flash.ld
rename to hw/bsp/samd21/boards/atsamd21_xpro/samd21j18a_flash.ld
diff --git a/hw/bsp/mimxrt1050_evkb/board.h b/hw/bsp/samd21/boards/circuitplayground_express/board.h
similarity index 78%
rename from hw/bsp/mimxrt1050_evkb/board.h
rename to hw/bsp/samd21/boards/circuitplayground_express/board.h
index 3f660ac7d..2d7da1c0b 100644
--- a/hw/bsp/mimxrt1050_evkb/board.h
+++ b/hw/bsp/samd21/boards/circuitplayground_express/board.h
@@ -1,7 +1,7 @@
 /* 
  * The MIT License (MIT)
  *
- * Copyright (c) 2019, Ha Thach (tinyusb.org)
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,11 +24,27 @@
  * This file is part of the TinyUSB stack.
  */
 
-
 #ifndef BOARD_H_
 #define BOARD_H_
 
-// required since iMX RT10xx SDK include this file for board size
-#define BOARD_FLASH_SIZE (0x4000000U)
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               17
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            28
+#define BUTTON_STATE_ACTIVE   1
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
 
 #endif /* BOARD_H_ */
diff --git a/hw/bsp/samd21/boards/circuitplayground_express/board.mk b/hw/bsp/samd21/boards/circuitplayground_express/board.mk
new file mode 100644
index 000000000..bb426cdaa
--- /dev/null
+++ b/hw/bsp/samd21/boards/circuitplayground_express/board.mk
@@ -0,0 +1,9 @@
+CFLAGS += -D__SAMD21G18A__
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD21G18
+
+flash: flash-bossac
diff --git a/hw/bsp/circuitplayground_express/samd21g18a_flash.ld b/hw/bsp/samd21/boards/circuitplayground_express/circuitplayground_express.ld
similarity index 100%
rename from hw/bsp/circuitplayground_express/samd21g18a_flash.ld
rename to hw/bsp/samd21/boards/circuitplayground_express/circuitplayground_express.ld
diff --git a/hw/bsp/samd21/boards/feather_m0_express/board.h b/hw/bsp/samd21/boards/feather_m0_express/board.h
new file mode 100644
index 000000000..b9292b9af
--- /dev/null
+++ b/hw/bsp/samd21/boards/feather_m0_express/board.h
@@ -0,0 +1,50 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               17
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            15
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/samd21/boards/feather_m0_express/board.mk b/hw/bsp/samd21/boards/feather_m0_express/board.mk
new file mode 100644
index 000000000..bb426cdaa
--- /dev/null
+++ b/hw/bsp/samd21/boards/feather_m0_express/board.mk
@@ -0,0 +1,9 @@
+CFLAGS += -D__SAMD21G18A__
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD21G18
+
+flash: flash-bossac
diff --git a/hw/bsp/feather_m0_express/samd21g18a_flash.ld b/hw/bsp/samd21/boards/feather_m0_express/feather_m0_express.ld
similarity index 100%
rename from hw/bsp/feather_m0_express/samd21g18a_flash.ld
rename to hw/bsp/samd21/boards/feather_m0_express/feather_m0_express.ld
diff --git a/hw/bsp/samd21/boards/itsybitsy_m0/board.h b/hw/bsp/samd21/boards/itsybitsy_m0/board.h
new file mode 100644
index 000000000..177fb695e
--- /dev/null
+++ b/hw/bsp/samd21/boards/itsybitsy_m0/board.h
@@ -0,0 +1,50 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               17
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            21
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/samd21/boards/itsybitsy_m0/board.mk b/hw/bsp/samd21/boards/itsybitsy_m0/board.mk
new file mode 100644
index 000000000..bb426cdaa
--- /dev/null
+++ b/hw/bsp/samd21/boards/itsybitsy_m0/board.mk
@@ -0,0 +1,9 @@
+CFLAGS += -D__SAMD21G18A__
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD21G18
+
+flash: flash-bossac
diff --git a/hw/bsp/itsybitsy_m0/samd21g18a_flash.ld b/hw/bsp/samd21/boards/itsybitsy_m0/itsybitsy_m0.ld
similarity index 100%
rename from hw/bsp/itsybitsy_m0/samd21g18a_flash.ld
rename to hw/bsp/samd21/boards/itsybitsy_m0/itsybitsy_m0.ld
diff --git a/hw/bsp/mimxrt1010_evk/board.h b/hw/bsp/samd21/boards/luna/board.h
similarity index 81%
rename from hw/bsp/mimxrt1010_evk/board.h
rename to hw/bsp/samd21/boards/luna/board.h
index 7e4b57297..2e0a2a60f 100644
--- a/hw/bsp/mimxrt1010_evk/board.h
+++ b/hw/bsp/samd21/boards/luna/board.h
@@ -1,7 +1,7 @@
 /* 
  * The MIT License (MIT)
  *
- * Copyright (c) 2019, Ha Thach (tinyusb.org)
+ * Copyright (c) 2021, Ha Thach (tinyusb.org)
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,13 +24,23 @@
  * This file is part of the TinyUSB stack.
  */
 
-
 #ifndef BOARD_H_
 #define BOARD_H_
 
-#include "fsl_device_registers.h"
+#ifdef __cplusplus
+ extern "C" {
+#endif
 
-// required since iMX RT10xx SDK include this file for board size
-#define BOARD_FLASH_SIZE (0x1000000U)
+// LED
+#define LED_PIN               PIN_PA22
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            PIN_PB22
+#define BUTTON_STATE_ACTIVE   0
+
+#ifdef __cplusplus
+ }
+#endif
 
 #endif /* BOARD_H_ */
diff --git a/hw/bsp/samd21/boards/luna/board.mk b/hw/bsp/samd21/boards/luna/board.mk
new file mode 100644
index 000000000..0feae9313
--- /dev/null
+++ b/hw/bsp/samd21/boards/luna/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -D__SAMD21G18A__
+
+LD_FILE = $(BOARD_PATH)/samd21g18a_flash.ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD21G18
+
+# flash using dfu-util
+flash: $(BUILD)/$(BOARD)-firmware.bin
+	dfu-util -a 0 -d 1d50:615c -D $< || dfu-util -a 0 -d 16d0:05a5 -D $<
+
diff --git a/hw/bsp/luna/samd21g18a_flash.ld b/hw/bsp/samd21/boards/luna/samd21g18a_flash.ld
similarity index 100%
rename from hw/bsp/luna/samd21g18a_flash.ld
rename to hw/bsp/samd21/boards/luna/samd21g18a_flash.ld
diff --git a/hw/bsp/samd21/boards/metro_m0_express/board.h b/hw/bsp/samd21/boards/metro_m0_express/board.h
new file mode 100644
index 000000000..b9292b9af
--- /dev/null
+++ b/hw/bsp/samd21/boards/metro_m0_express/board.h
@@ -0,0 +1,50 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               17
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            15
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/samd21/boards/metro_m0_express/board.mk b/hw/bsp/samd21/boards/metro_m0_express/board.mk
new file mode 100644
index 000000000..bb426cdaa
--- /dev/null
+++ b/hw/bsp/samd21/boards/metro_m0_express/board.mk
@@ -0,0 +1,9 @@
+CFLAGS += -D__SAMD21G18A__
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD21G18
+
+flash: flash-bossac
diff --git a/hw/bsp/metro_m0_express/samd21g18a_flash.ld b/hw/bsp/samd21/boards/metro_m0_express/metro_m0_express.ld
similarity index 100%
rename from hw/bsp/metro_m0_express/samd21g18a_flash.ld
rename to hw/bsp/samd21/boards/metro_m0_express/metro_m0_express.ld
diff --git a/hw/bsp/samd21/boards/seeeduino_xiao/board.h b/hw/bsp/samd21/boards/seeeduino_xiao/board.h
new file mode 100644
index 000000000..abededed2
--- /dev/null
+++ b/hw/bsp/samd21/boards/seeeduino_xiao/board.h
@@ -0,0 +1,50 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               26
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            9 // PA4 pin D1 on seed input
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/samd21/boards/seeeduino_xiao/board.mk b/hw/bsp/samd21/boards/seeeduino_xiao/board.mk
new file mode 100644
index 000000000..54591b3a5
--- /dev/null
+++ b/hw/bsp/samd21/boards/seeeduino_xiao/board.mk
@@ -0,0 +1,9 @@
+CFLAGS += -D__SAMD21G18A__
+
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD21G18
+
+# flash using jlink
+flash: flash-jlink
diff --git a/hw/bsp/seeeduino_xiao/samd21g18a_flash.ld b/hw/bsp/samd21/boards/seeeduino_xiao/seeeduino_xiao.ld
similarity index 100%
rename from hw/bsp/seeeduino_xiao/samd21g18a_flash.ld
rename to hw/bsp/samd21/boards/seeeduino_xiao/seeeduino_xiao.ld
diff --git a/hw/bsp/itsybitsy_m0/itsybitsy_m0.c b/hw/bsp/samd21/family.c
similarity index 94%
rename from hw/bsp/itsybitsy_m0/itsybitsy_m0.c
rename to hw/bsp/samd21/family.c
index 652bc6b3d..eb5b55863 100644
--- a/hw/bsp/itsybitsy_m0/itsybitsy_m0.c
+++ b/hw/bsp/samd21/family.c
@@ -26,6 +26,7 @@
 
 #include "sam.h"
 #include "bsp/board.h"
+#include "board.h"
 
 #include "hal/include/hal_gpio.h"
 #include "hal/include/hal_init.h"
@@ -46,8 +47,6 @@ void USB_Handler(void)
 //--------------------------------------------------------------------+
 // MACRO TYPEDEF CONSTANT ENUM DECLARATION
 //--------------------------------------------------------------------+
-#define LED_PIN      17
-#define BUTTON_PIN   21 // pin D7
 
 /* Referenced GCLKs, should be initialized firstly */
 #define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
@@ -75,11 +74,11 @@ void board_init(void)
 
   // Led init
   gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 0);
+  board_led_write(false);
 
   // Button init
   gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
+  gpio_set_pin_pull_mode(BUTTON_PIN, BUTTON_STATE_ACTIVE ? GPIO_PULL_DOWN : GPIO_PULL_UP);
 
 #if CFG_TUSB_OS  == OPT_OS_FREERTOS
   // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
@@ -120,13 +119,12 @@ void board_init(void)
 
 void board_led_write(bool state)
 {
-  gpio_set_pin_level(LED_PIN, state);
+  gpio_set_pin_level(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
 }
 
 uint32_t board_button_read(void)
 {
-  // button is active low
-  return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
+  return BUTTON_STATE_ACTIVE == gpio_get_pin_level(BUTTON_PIN);
 }
 
 int board_uart_read(uint8_t* buf, int len)
diff --git a/hw/bsp/itsybitsy_m0/board.mk b/hw/bsp/samd21/family.mk
similarity index 85%
rename from hw/bsp/itsybitsy_m0/board.mk
rename to hw/bsp/samd21/family.mk
index 61dc7c665..2f4d6b7ae 100644
--- a/hw/bsp/itsybitsy_m0/board.mk
+++ b/hw/bsp/samd21/family.mk
@@ -1,16 +1,14 @@
+include $(TOP)/$(BOARD_PATH)/board.mk
+
 CFLAGS += \
   -flto \
   -mthumb \
-  -mabi=aapcs-linux \
+  -mabi=aapcs \
   -mcpu=cortex-m0plus \
   -nostdlib -nostartfiles \
-  -D__SAMD21G18A__ \
   -DCONF_DFLL_OVERWRITE_CALIBRATION=0 \
   -DCFG_TUSB_MCU=OPT_MCU_SAMD21
 
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd21g18a_flash.ld
-
 SRC_C += \
 	hw/mcu/microchip/asf4/samd21/gcc/gcc/startup_samd21.c \
 	hw/mcu/microchip/asf4/samd21/gcc/system_samd21.c \
@@ -20,6 +18,7 @@ SRC_C += \
 	hw/mcu/microchip/asf4/samd21/hal/src/hal_atomic.c
 
 INC += \
+	$(TOP)/$(BOARD_PATH) \
 	$(TOP)/hw/mcu/microchip/asf4/samd21/ \
 	$(TOP)/hw/mcu/microchip/asf4/samd21/config \
 	$(TOP)/hw/mcu/microchip/asf4/samd21/include \
@@ -37,14 +36,11 @@ CHIP_FAMILY = samd
 # For freeRTOS port source
 FREERTOS_PORT = ARM_CM0
 
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD21G18
-
 # flash using bossac at least version 1.8
 # can be found in arduino15/packages/arduino/tools/bossac/
 # Add it to your PATH or change BOSSAC variable to match your installation
 BOSSAC = bossac
 
-flash: $(BUILD)/$(BOARD)-firmware.bin
+flash-bossac: $(BUILD)/$(BOARD)-firmware.bin
 	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
 	$(BOSSAC) --port=$(SERIAL) -U -i --offset=0x2000 -e -w $^ -R
diff --git a/hw/bsp/samd51/boards/feather_m4_express/board.h b/hw/bsp/samd51/boards/feather_m4_express/board.h
new file mode 100644
index 000000000..a2b361a49
--- /dev/null
+++ b/hw/bsp/samd51/boards/feather_m4_express/board.h
@@ -0,0 +1,50 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               23
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            16 // D5
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/samd51/boards/feather_m4_express/board.mk b/hw/bsp/samd51/boards/feather_m4_express/board.mk
new file mode 100644
index 000000000..a8a98a987
--- /dev/null
+++ b/hw/bsp/samd51/boards/feather_m4_express/board.mk
@@ -0,0 +1,8 @@
+CFLAGS += -D__SAMD51J19A__
+
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD51J19
+
+flash: flash-bossac
diff --git a/hw/bsp/feather_m4_express/samd51g19a_flash.ld b/hw/bsp/samd51/boards/feather_m4_express/feather_m4_express.ld
similarity index 100%
rename from hw/bsp/feather_m4_express/samd51g19a_flash.ld
rename to hw/bsp/samd51/boards/feather_m4_express/feather_m4_express.ld
diff --git a/hw/bsp/samd51/boards/itsybitsy_m4/board.h b/hw/bsp/samd51/boards/itsybitsy_m4/board.h
new file mode 100644
index 000000000..a3788a79b
--- /dev/null
+++ b/hw/bsp/samd51/boards/itsybitsy_m4/board.h
@@ -0,0 +1,50 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               22
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            18 // D5
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/samd51/boards/itsybitsy_m4/board.mk b/hw/bsp/samd51/boards/itsybitsy_m4/board.mk
new file mode 100644
index 000000000..57a680e91
--- /dev/null
+++ b/hw/bsp/samd51/boards/itsybitsy_m4/board.mk
@@ -0,0 +1,9 @@
+CFLAGS += -D__SAMD51J19A__
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD51J19
+
+flash: flash-bossac
diff --git a/hw/bsp/itsybitsy_m4/samd51g19a_flash.ld b/hw/bsp/samd51/boards/itsybitsy_m4/itsybitsy_m4.ld
similarity index 100%
rename from hw/bsp/itsybitsy_m4/samd51g19a_flash.ld
rename to hw/bsp/samd51/boards/itsybitsy_m4/itsybitsy_m4.ld
diff --git a/hw/bsp/samd51/boards/metro_m4_express/board.h b/hw/bsp/samd51/boards/metro_m4_express/board.h
new file mode 100644
index 000000000..de604bae3
--- /dev/null
+++ b/hw/bsp/samd51/boards/metro_m4_express/board.h
@@ -0,0 +1,50 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PIN               16
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            (32+14) // D5
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_RX_PIN           4
+#define UART_TX_PIN           5
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/samd51/boards/metro_m4_express/board.mk b/hw/bsp/samd51/boards/metro_m4_express/board.mk
new file mode 100644
index 000000000..d7953cc24
--- /dev/null
+++ b/hw/bsp/samd51/boards/metro_m4_express/board.mk
@@ -0,0 +1,10 @@
+CFLAGS += -D__SAMD51J19A__
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/$(BOARD).ld
+
+# For flash-jlink target
+JLINK_DEVICE = ATSAMD51J19
+
+flash: flash-bossac
+
diff --git a/hw/bsp/metro_m4_express/samd51g19a_flash.ld b/hw/bsp/samd51/boards/metro_m4_express/metro_m4_express.ld
similarity index 100%
rename from hw/bsp/metro_m4_express/samd51g19a_flash.ld
rename to hw/bsp/samd51/boards/metro_m4_express/metro_m4_express.ld
diff --git a/hw/bsp/feather_m4_express/feather_m4_express.c b/hw/bsp/samd51/family.c
similarity index 98%
rename from hw/bsp/feather_m4_express/feather_m4_express.c
rename to hw/bsp/samd51/family.c
index 72183c612..020e638c4 100644
--- a/hw/bsp/feather_m4_express/feather_m4_express.c
+++ b/hw/bsp/samd51/family.c
@@ -26,6 +26,7 @@
 
 #include "sam.h"
 #include "bsp/board.h"
+#include "board.h"
 
 #include "hal/include/hal_gpio.h"
 #include "hal/include/hal_init.h"
@@ -58,8 +59,6 @@ void USB_3_Handler (void)
 //--------------------------------------------------------------------+
 // MACRO TYPEDEF CONSTANT ENUM DECLARATION
 //--------------------------------------------------------------------+
-#define LED_PIN      23
-#define BUTTON_PIN   16  // pin D5
 
 /* Referenced GCLKs, should be initialized firstly */
 #define _GCLK_INIT_1ST 0xFFFFFFFF
diff --git a/hw/bsp/metro_m4_express/board.mk b/hw/bsp/samd51/family.mk
similarity index 85%
rename from hw/bsp/metro_m4_express/board.mk
rename to hw/bsp/samd51/family.mk
index 6cc6a9091..097593748 100644
--- a/hw/bsp/metro_m4_express/board.mk
+++ b/hw/bsp/samd51/family.mk
@@ -1,19 +1,17 @@
+include $(TOP)/$(BOARD_PATH)/board.mk
+
 CFLAGS += \
   -flto \
   -mthumb \
-  -mabi=aapcs-linux \
+  -mabi=aapcs \
   -mcpu=cortex-m4 \
   -mfloat-abi=hard \
   -mfpu=fpv4-sp-d16 \
   -nostdlib -nostartfiles \
-  -D__SAMD51J19A__ \
   -DCFG_TUSB_MCU=OPT_MCU_SAMD51
 
 CFLAGS += -Wno-error=undef
 
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd51g19a_flash.ld
-
 SRC_C += \
 	hw/mcu/microchip/asf4/samd51/gcc/gcc/startup_samd51.c \
 	hw/mcu/microchip/asf4/samd51/gcc/system_samd51.c \
@@ -24,6 +22,7 @@ SRC_C += \
 	hw/mcu/microchip/asf4/samd51/hal/src/hal_atomic.c
 
 INC += \
+	$(TOP)/$(BOARD_PATH) \
 	$(TOP)/hw/mcu/microchip/asf4/samd51/ \
 	$(TOP)/hw/mcu/microchip/asf4/samd51/config \
 	$(TOP)/hw/mcu/microchip/asf4/samd51/include \
@@ -40,14 +39,11 @@ CHIP_FAMILY = samd
 # For freeRTOS port source
 FREERTOS_PORT = ARM_CM4F
 
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD51J19
-
 # flash using bossac at least version 1.8
 # can be found in arduino15/packages/arduino/tools/bossac/
 # Add it to your PATH or change BOSSAC variable to match your installation
 BOSSAC = bossac
 
-flash: $(BUILD)/$(BOARD)-firmware.bin
+flash-bossac: $(BUILD)/$(BOARD)-firmware.bin
 	@:$(call check_defined, SERIAL, example: SERIAL=/dev/ttyACM0)
 	$(BOSSAC) --port=$(SERIAL) -U -i --offset=0x4000 -e -w $^ -R
diff --git a/hw/bsp/seeeduino_xiao/board.mk b/hw/bsp/seeeduino_xiao/board.mk
deleted file mode 100644
index c954dbc29..000000000
--- a/hw/bsp/seeeduino_xiao/board.mk
+++ /dev/null
@@ -1,44 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs-linux \
-  -mcpu=cortex-m0plus \
-  -nostdlib -nostartfiles \
-  -D__SAMD21G18A__ \
-  -DCONF_DFLL_OVERWRITE_CALIBRATION=0 \
-  -DCFG_TUSB_MCU=OPT_MCU_SAMD21
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/samd21g18a_flash.ld
-
-SRC_C += \
-	hw/mcu/microchip/asf4/samd21/gcc/gcc/startup_samd21.c \
-	hw/mcu/microchip/asf4/samd21/gcc/system_samd21.c \
-	hw/mcu/microchip/asf4/samd21/hpl/gclk/hpl_gclk.c \
-	hw/mcu/microchip/asf4/samd21/hpl/pm/hpl_pm.c \
-	hw/mcu/microchip/asf4/samd21/hpl/sysctrl/hpl_sysctrl.c \
-	hw/mcu/microchip/asf4/samd21/hal/src/hal_atomic.c
-
-INC += \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/config \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hal/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hal/utils/include \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hpl/pm/ \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hpl/port \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/hri \
-	$(TOP)/hw/mcu/microchip/asf4/samd21/CMSIS/Include
-
-# For TinyUSB port source 
-VENDOR = microchip
-CHIP_FAMILY = samd
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM0
-
-# For flash-jlink target
-JLINK_DEVICE = ATSAMD21G18
-
-# flash using jlink
-flash: flash-jlink
diff --git a/hw/bsp/seeeduino_xiao/seeeduino_xiao.c b/hw/bsp/seeeduino_xiao/seeeduino_xiao.c
deleted file mode 100644
index 0456228da..000000000
--- a/hw/bsp/seeeduino_xiao/seeeduino_xiao.c
+++ /dev/null
@@ -1,150 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "sam.h"
-#include "bsp/board.h"
-
-#include "hal/include/hal_gpio.h"
-#include "hal/include/hal_init.h"
-#include "hri/hri_nvmctrl_d21.h"
-
-#include "hpl/gclk/hpl_gclk_base.h"
-#include "hpl_pm_config.h"
-#include "hpl/pm/hpl_pm_base.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void USB_Handler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM DECLARATION
-//--------------------------------------------------------------------+
-#define LED_PIN      26
-#define BUTTON_PIN   9 // PA4, pin D1 on seeed pinout
-
-/* Referenced GCLKs, should be initialized firstly */
-#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
-
-/* Not referenced GCLKs, initialized last */
-#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
-
-void board_init(void)
-{
-  // Clock init ( follow hpl_init.c )
-  hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);
-
-  _pm_init();
-  _sysctrl_init_sources();
-#if _GCLK_INIT_1ST
-  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
-#endif
-  _sysctrl_init_referenced_generators();
-  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
-
-  // Update SystemCoreClock since it is hard coded with asf4 and not correct
-  // Init 1ms tick timer (samd SystemCoreClock may not correct)
-  SystemCoreClock = CONF_CPU_FREQUENCY;
-  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
-
-  // Led init
-  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(LED_PIN, 0);
-
-  // Button init
-  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
-  gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
-
-#if CFG_TUSB_OS  == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  NVIC_SetPriority(USB_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
-#endif
-
-  /* USB Clock init
-   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
-   * for low speed and full speed operation. */
-  _pm_enable_bus_clock(PM_BUS_APBB, USB);
-  _pm_enable_bus_clock(PM_BUS_AHB, USB);
-  _gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
-
-  // USB Pin Init
-  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA24, false);
-  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
-  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
-  gpio_set_pin_level(PIN_PA25, false);
-  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
-
-  gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
-  gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  gpio_set_pin_level(LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  // button is active low
-  return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler(void) {
-	while(1);
-}
diff --git a/hw/bsp/stlinkv3mini/board.mk b/hw/bsp/stlinkv3mini/board.mk
deleted file mode 100644
index fb8b6b29f..000000000
--- a/hw/bsp/stlinkv3mini/board.mk
+++ /dev/null
@@ -1,63 +0,0 @@
-# Only OTG-HS has a connector on this board
-
-SPEED ?= high
-
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F723xx \
-  -DHSE_VALUE=25000000 \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F7 \
-  -DBOARD_DEVICE_RHPORT_NUM=1
-
-ifeq ($(SPEED), high)
-  CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
-  $(info "Using OTG_HS in HighSpeed mode")
-else
-  CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
-  $(info "Using OTG_HS in FullSpeed mode")
-endif
-
-# mcu driver cause following warnings
-CFLAGS += -Wno-error=shadow -Wno-error=cast-align
-
-ST_FAMILY = f7
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F723xE_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc_ex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_pwr_ex.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/stlinkv3mini/stlinkv3mini.c b/hw/bsp/stlinkv3mini/stlinkv3mini.c
deleted file mode 100644
index 03babcfa9..000000000
--- a/hw/bsp/stlinkv3mini/stlinkv3mini.c
+++ /dev/null
@@ -1,298 +0,0 @@
-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2020 Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de),
- * Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f7xx_hal.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-// Despite being call USB2_OTG
-// OTG_HS is marked as RHPort1 by TinyUSB to be consistent across stm32 port
-void OTG_HS_IRQHandler(void)
-{
-  tud_int_handler(1);
-}
-
-// Pin configuartion with help from
-// RadioOperator/CMSIS-DAP_for_STLINK-V3MINI.git
-// CMSIS-DAP_for_STLINK-V3MINI/STLINK-V3MINI/Sch/STLINK-V3MINI_GPIOs.JPG
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOA
-#define LED_PIN               GPIO_PIN_10
-#define LED_STATE_ON          1
-
-/* No Buttom */
-
-#define UARTx                 USART6
-#define UART_GPIO_PORT        GPIOG
-#define UART_GPIO_AF          GPIO_AF8_USART6
-#define UART_TX_PIN           GPIO_PIN_9
-#define UART_RX_PIN           GPIO_PIN_14
-
-UART_HandleTypeDef UartHandle;
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-, LED
-  __HAL_RCC_GPIOB_CLK_ENABLE();  // OTG_HS
-  __HAL_RCC_GPIOD_CLK_ENABLE();  // OTG_HS ID
-  __HAL_RCC_GPIOG_CLK_ENABLE();  // Uart TX, RX
-  __HAL_RCC_USART6_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 216000000
-  *            HCLK(Hz)                       = 216000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 25000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 432
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 9
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 7
-  *         The USB clock configuration from PLLSAI:
-  *            PLLSAIP                        = 8
-  *            PLLSAIN                        = 384
-  *            PLLSAIQ                        = 7
-  * @param  None
-  * @retval None
-  */
-void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 432;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 9;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Activate the OverDrive to reach the 216 MHz Frequency */
-  HAL_PWREx_EnableOverDrive();
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
-}
-
-void board_init(void)
-{
-
-
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#endif
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  // Uart
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
-
-  UartHandle.Instance        = UARTx;
-  UartHandle.Init.BaudRate   = CFG_BOARD_UART_BAUDRATE;
-  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
-  UartHandle.Init.StopBits   = UART_STOPBITS_1;
-  UartHandle.Init.Parity     = UART_PARITY_NONE;
-  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
-  UartHandle.Init.Mode       = UART_MODE_TX_RX;
-  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
-  HAL_UART_Init(&UartHandle);
-
-#if BOARD_DEVICE_RHPORT_NUM == 0
-  /* Configure USB FS GPIOs */
-  /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure OTG-FS ID pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Enable USB FS Clocks */
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
-
-#else
-  /* Configure USB HS GPIOs */
-  /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = (GPIO_PIN_14 | GPIO_PIN_15);
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
-
-  // Enable HS VBUS sense (B device) via pin PB13
-  USB_OTG_HS->GCCFG |= USB_OTG_GCCFG_VBDEN;
-
-  /* Configure OTG-HS ID pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_13;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
-
-  /* Enable PHYC Clocks */
-  __HAL_RCC_OTGPHYC_CLK_ENABLE();
-
-  /* Enable USB HS Clocks */
-  __HAL_RCC_USB_OTG_HS_CLK_ENABLE();
-  __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_HS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
-
-  // B-peripheral session valid override enable
-  USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
-  USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
-
-  // Force device mode
-  USB_OTG_HS->GUSBCFG &= ~USB_OTG_GUSBCFG_FHMOD;
-  USB_OTG_HS->GUSBCFG |= USB_OTG_GUSBCFG_FDMOD;
-
-#endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  return 0;
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
-  return len;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/feather_stm32f405/STM32F405RGTx_FLASH.ld b/hw/bsp/stm32f4/boards/feather_stm32f405/STM32F405RGTx_FLASH.ld
similarity index 100%
rename from hw/bsp/feather_stm32f405/STM32F405RGTx_FLASH.ld
rename to hw/bsp/stm32f4/boards/feather_stm32f405/STM32F405RGTx_FLASH.ld
diff --git a/hw/bsp/stm32f4/boards/feather_stm32f405/board.h b/hw/bsp/stm32f4/boards/feather_stm32f405/board.h
new file mode 100644
index 000000000..19d0a1ea4
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/feather_stm32f405/board.h
@@ -0,0 +1,104 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PORT              GPIOC
+#define LED_PIN               GPIO_PIN_1
+#define LED_STATE_ON          1
+
+// Button: Pin D5
+#define BUTTON_PORT           GPIOC
+#define BUTTON_PIN            GPIO_PIN_7
+#define BUTTON_STATE_ACTIVE   0
+
+// UART
+#define UART_DEV              USART3
+#define UART_GPIO_PORT        GPIOB
+#define UART_GPIO_AF          GPIO_AF7_USART3
+#define UART_TX_PIN           GPIO_PIN_10
+#define UART_RX_PIN           GPIO_PIN_11
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 336;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 7;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+     clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
+
+  // Enable clocks for LED, Button, Uart
+  __HAL_RCC_GPIOB_CLK_ENABLE();
+  __HAL_RCC_GPIOC_CLK_ENABLE();
+  __HAL_RCC_USART3_CLK_ENABLE();
+}
+
+static inline void board_vbus_sense_init(void)
+{
+  // Enable VBUS sense (B device) via pin PA9
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
+  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk b/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk
new file mode 100644
index 000000000..f78bb63fc
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk
@@ -0,0 +1,12 @@
+CFLAGS += -DSTM32F405xx
+
+LD_FILE = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
+
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
+
+# For flash-jlink target
+JLINK_DEVICE = stm32f405rg
+
+# flash target ROM bootloader
+flash: $(BUILD)/$(BOARD)-firmware.bin
+	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<
diff --git a/hw/bsp/feather_stm32f405/stm32f4xx_hal_conf.h b/hw/bsp/stm32f4/boards/feather_stm32f405/stm32f4xx_hal_conf.h
similarity index 100%
rename from hw/bsp/feather_stm32f405/stm32f4xx_hal_conf.h
rename to hw/bsp/stm32f4/boards/feather_stm32f405/stm32f4xx_hal_conf.h
diff --git a/hw/bsp/pyboardv11/STM32F405RGTx_FLASH.ld b/hw/bsp/stm32f4/boards/pyboardv11/STM32F405RGTx_FLASH.ld
similarity index 100%
rename from hw/bsp/pyboardv11/STM32F405RGTx_FLASH.ld
rename to hw/bsp/stm32f4/boards/pyboardv11/STM32F405RGTx_FLASH.ld
diff --git a/hw/bsp/stm32f4/boards/pyboardv11/board.h b/hw/bsp/stm32f4/boards/pyboardv11/board.h
new file mode 100644
index 000000000..685919c57
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/pyboardv11/board.h
@@ -0,0 +1,102 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// Blue LED is chosen because the other LEDs are connected to ST-LINK lines.
+#define LED_PORT              GPIOB
+#define LED_PIN               GPIO_PIN_4
+#define LED_STATE_ON          1
+
+#define BUTTON_PORT           GPIOB
+#define BUTTON_PIN            GPIO_PIN_3
+#define BUTTON_STATE_ACTIVE   1
+
+// Enable PA2 as the debug log UART
+// It is not routed to the ST/Link on the Discovery board.
+//#define UART_DEV              USART2
+//#define UART_GPIO_PORT        GPIOA
+//#define UART_GPIO_AF          GPIO_AF7_USART2
+//#define UART_TX_PIN           GPIO_PIN_2
+//#define UART_RX_PIN           GPIO_PIN_3
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 336;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 7;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+     clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
+
+  // Enable clocks for LED, Button, Uart
+  __HAL_RCC_GPIOB_CLK_ENABLE();
+}
+
+static inline void board_vbus_sense_init(void)
+{
+  // Enable VBUS sense (B device) via pin PA9
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
+  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f4/boards/pyboardv11/board.mk b/hw/bsp/stm32f4/boards/pyboardv11/board.mk
new file mode 100644
index 000000000..02dcd1219
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/pyboardv11/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DSTM32F405xx
+
+LD_FILE = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
+
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
+
+# For flash-jlink target
+JLINK_DEVICE = stm32f405rg
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/pyboardv11/stm32f4xx_hal_conf.h b/hw/bsp/stm32f4/boards/pyboardv11/stm32f4xx_hal_conf.h
similarity index 98%
rename from hw/bsp/pyboardv11/stm32f4xx_hal_conf.h
rename to hw/bsp/stm32f4/boards/pyboardv11/stm32f4xx_hal_conf.h
index dbef20e0a..b892df3b6 100644
--- a/hw/bsp/pyboardv11/stm32f4xx_hal_conf.h
+++ b/hw/bsp/stm32f4/boards/pyboardv11/stm32f4xx_hal_conf.h
@@ -75,7 +75,7 @@
 /* #define HAL_MMC_MODULE_ENABLED   */
 /* #define HAL_SPI_MODULE_ENABLED   */
 /* #define HAL_TIM_MODULE_ENABLED   */
-/* #define HAL_UART_MODULE_ENABLED   */
+#define HAL_UART_MODULE_ENABLED
 /* #define HAL_USART_MODULE_ENABLED   */
 /* #define HAL_IRDA_MODULE_ENABLED   */
 /* #define HAL_SMARTCARD_MODULE_ENABLED   */
@@ -199,6 +199,8 @@
 #define  USE_HAL_SPI_REGISTER_CALLBACKS     0U /* SPI register callback disabled     */
 #define  USE_HAL_SWPMI_REGISTER_CALLBACKS   0U /* SWPMI register callback disabled   */
 #define  USE_HAL_TIM_REGISTER_CALLBACKS     0U /* TIM register callback disabled     */
+#define  USE_HAL_UART_REGISTER_CALLBACKS    0U /* UART register callback disabled      */
+#define  USE_HAL_USART_REGISTER_CALLBACKS   0U /* USART register callback disabled     */
 #define  USE_HAL_WWDG_REGISTER_CALLBACKS    0U /* WWDG register callback disabled    */
 
 /* ########################## Assert Selection ############################## */
diff --git a/hw/bsp/stm32f401blackpill/STM32F401VCTx_FLASH.ld b/hw/bsp/stm32f4/boards/stm32f401blackpill/STM32F401VCTx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f401blackpill/STM32F401VCTx_FLASH.ld
rename to hw/bsp/stm32f4/boards/stm32f401blackpill/STM32F401VCTx_FLASH.ld
diff --git a/hw/bsp/stm32f4/boards/stm32f401blackpill/board.h b/hw/bsp/stm32f4/boards/stm32f401blackpill/board.h
new file mode 100644
index 000000000..570f5fcec
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f401blackpill/board.h
@@ -0,0 +1,106 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PORT              GPIOC
+#define LED_PIN               GPIO_PIN_13
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   0
+
+// Enable PA2 as the debug log UART
+//#define UART_DEV              USART2
+//#define UART_GPIO_PORT        GPIOA
+//#define UART_GPIO_AF          GPIO_AF7_USART2
+//#define UART_TX_PIN           GPIO_PIN_2
+//#define UART_RX_PIN           GPIO_PIN_3
+
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 336;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
+  RCC_OscInitStruct.PLL.PLLQ = 7;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+     clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2);
+
+  // Enable clocks for LED, Button, Uart
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+  __HAL_RCC_GPIOC_CLK_ENABLE();
+  //__HAL_RCC_USART2_CLK_ENABLE();
+}
+
+static inline void board_vbus_sense_init(void)
+{
+  // Blackpill doens't use VBUS sense (B device) explicitly disable it
+  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS;
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSBSEN;
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSASEN;
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk b/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk
new file mode 100644
index 000000000..2d8b10318
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk
@@ -0,0 +1,12 @@
+CFLAGS += -DSTM32F401xC
+
+LD_FILE = $(BOARD_PATH)/STM32F401VCTx_FLASH.ld
+
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f401xc.s
+
+# For flash-jlink target
+JLINK_DEVICE = stm32f401cc
+
+# flash target ROM bootloader
+flash: $(BUILD)/$(BOARD)-firmware.bin
+	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<
diff --git a/hw/bsp/stm32f401blackpill/stm32f4xx_hal_conf.h b/hw/bsp/stm32f4/boards/stm32f401blackpill/stm32f4xx_hal_conf.h
similarity index 99%
rename from hw/bsp/stm32f401blackpill/stm32f4xx_hal_conf.h
rename to hw/bsp/stm32f4/boards/stm32f401blackpill/stm32f4xx_hal_conf.h
index a6c88f249..2ab9a1d57 100644
--- a/hw/bsp/stm32f401blackpill/stm32f4xx_hal_conf.h
+++ b/hw/bsp/stm32f4/boards/stm32f401blackpill/stm32f4xx_hal_conf.h
@@ -68,7 +68,7 @@
 /* #define HAL_SD_MODULE_ENABLED       */
 // #define HAL_SPI_MODULE_ENABLED
 /* #define HAL_TIM_MODULE_ENABLED      */
-/* #define HAL_UART_MODULE_ENABLED     */
+#define HAL_UART_MODULE_ENABLED
 /* #define HAL_USART_MODULE_ENABLED    */ 
 /* #define HAL_IRDA_MODULE_ENABLED     */
 /* #define HAL_SMARTCARD_MODULE_ENABLED */
diff --git a/hw/bsp/stm32f407disco/STM32F407VGTx_FLASH.ld b/hw/bsp/stm32f4/boards/stm32f407disco/STM32F407VGTx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f407disco/STM32F407VGTx_FLASH.ld
rename to hw/bsp/stm32f4/boards/stm32f407disco/STM32F407VGTx_FLASH.ld
diff --git a/hw/bsp/stm32f4/boards/stm32f407disco/board.h b/hw/bsp/stm32f4/boards/stm32f407disco/board.h
new file mode 100644
index 000000000..693e0393f
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f407disco/board.h
@@ -0,0 +1,105 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PORT              GPIOD
+#define LED_PIN               GPIO_PIN_14
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   1
+
+// Enable PA2 as the debug log UART
+// It is not routed to the ST/Link on the Discovery board.
+#define UART_DEV              USART2
+#define UART_GPIO_PORT        GPIOA
+#define UART_GPIO_AF          GPIO_AF7_USART2
+#define UART_TX_PIN           GPIO_PIN_2
+#define UART_RX_PIN           GPIO_PIN_3
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 336;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 7;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+     clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
+
+  // Enable clocks for LED, Button, Uart
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+  __HAL_RCC_GPIOD_CLK_ENABLE();
+  __HAL_RCC_USART2_CLK_ENABLE();
+}
+
+static inline void board_vbus_sense_init(void)
+{
+  // Enable VBUS sense (B device) via pin PA9
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
+  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f4/boards/stm32f407disco/board.mk b/hw/bsp/stm32f4/boards/stm32f407disco/board.mk
new file mode 100644
index 000000000..212b924b4
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f407disco/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DSTM32F407xx
+
+LD_FILE = $(BOARD_PATH)/STM32F407VGTx_FLASH.ld
+
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f407xx.s
+
+# For flash-jlink target
+JLINK_DEVICE = stm32f407vg
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stm32f407disco/stm32f4xx_hal_conf.h b/hw/bsp/stm32f4/boards/stm32f407disco/stm32f4xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stm32f407disco/stm32f4xx_hal_conf.h
rename to hw/bsp/stm32f4/boards/stm32f407disco/stm32f4xx_hal_conf.h
diff --git a/hw/bsp/stm32f411blackpill/STM32F411CEUx_FLASH.ld b/hw/bsp/stm32f4/boards/stm32f411blackpill/STM32F411CEUx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f411blackpill/STM32F411CEUx_FLASH.ld
rename to hw/bsp/stm32f4/boards/stm32f411blackpill/STM32F411CEUx_FLASH.ld
diff --git a/hw/bsp/stm32f4/boards/stm32f411blackpill/board.h b/hw/bsp/stm32f4/boards/stm32f411blackpill/board.h
new file mode 100644
index 000000000..570f5fcec
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f411blackpill/board.h
@@ -0,0 +1,106 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PORT              GPIOC
+#define LED_PIN               GPIO_PIN_13
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   0
+
+// Enable PA2 as the debug log UART
+//#define UART_DEV              USART2
+//#define UART_GPIO_PORT        GPIOA
+//#define UART_GPIO_AF          GPIO_AF7_USART2
+//#define UART_TX_PIN           GPIO_PIN_2
+//#define UART_RX_PIN           GPIO_PIN_3
+
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 336;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
+  RCC_OscInitStruct.PLL.PLLQ = 7;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+     clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2);
+
+  // Enable clocks for LED, Button, Uart
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+  __HAL_RCC_GPIOC_CLK_ENABLE();
+  //__HAL_RCC_USART2_CLK_ENABLE();
+}
+
+static inline void board_vbus_sense_init(void)
+{
+  // Blackpill doens't use VBUS sense (B device) explicitly disable it
+  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS;
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSBSEN;
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSASEN;
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk b/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk
new file mode 100644
index 000000000..a8287d0bc
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk
@@ -0,0 +1,12 @@
+CFLAGS += -DSTM32F411xE
+
+LD_FILE = $(BOARD_PATH)/STM32F411CEUx_FLASH.ld
+
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
+
+# For flash-jlink target
+JLINK_DEVICE = stm32f411ce
+
+# flash target ROM bootloader
+flash: $(BUILD)/$(BOARD)-firmware.bin
+	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<
diff --git a/hw/bsp/stm32f411blackpill/stm32f4xx_hal_conf.h b/hw/bsp/stm32f4/boards/stm32f411blackpill/stm32f4xx_hal_conf.h
similarity index 99%
rename from hw/bsp/stm32f411blackpill/stm32f4xx_hal_conf.h
rename to hw/bsp/stm32f4/boards/stm32f411blackpill/stm32f4xx_hal_conf.h
index a6c88f249..2ab9a1d57 100644
--- a/hw/bsp/stm32f411blackpill/stm32f4xx_hal_conf.h
+++ b/hw/bsp/stm32f4/boards/stm32f411blackpill/stm32f4xx_hal_conf.h
@@ -68,7 +68,7 @@
 /* #define HAL_SD_MODULE_ENABLED       */
 // #define HAL_SPI_MODULE_ENABLED
 /* #define HAL_TIM_MODULE_ENABLED      */
-/* #define HAL_UART_MODULE_ENABLED     */
+#define HAL_UART_MODULE_ENABLED
 /* #define HAL_USART_MODULE_ENABLED    */ 
 /* #define HAL_IRDA_MODULE_ENABLED     */
 /* #define HAL_SMARTCARD_MODULE_ENABLED */
diff --git a/hw/bsp/stm32f411disco/STM32F411VETx_FLASH.ld b/hw/bsp/stm32f4/boards/stm32f411disco/STM32F411VETx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f411disco/STM32F411VETx_FLASH.ld
rename to hw/bsp/stm32f4/boards/stm32f411disco/STM32F411VETx_FLASH.ld
diff --git a/hw/bsp/stm32f4/boards/stm32f411disco/board.h b/hw/bsp/stm32f4/boards/stm32f411disco/board.h
new file mode 100644
index 000000000..008a94a5d
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f411disco/board.h
@@ -0,0 +1,104 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// Orange LED
+#define LED_PORT              GPIOD
+#define LED_PIN               GPIO_PIN_13
+#define LED_STATE_ON          1
+
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   1
+
+// Enable PA2 as the debug log UART
+#define UART_DEV              USART2
+#define UART_GPIO_PORT        GPIOA
+#define UART_GPIO_AF          GPIO_AF7_USART2
+#define UART_TX_PIN           GPIO_PIN_2
+#define UART_RX_PIN           GPIO_PIN_3
+
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 336;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
+  RCC_OscInitStruct.PLL.PLLQ = 7;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+     clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2);
+
+  // Enable clocks for LED, Button, Uart
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+  __HAL_RCC_GPIOD_CLK_ENABLE();
+  __HAL_RCC_USART2_CLK_ENABLE();
+}
+
+static inline void board_vbus_sense_init(void)
+{
+  // Enable VBUS sense (B device) via pin PA9
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
+  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f4/boards/stm32f411disco/board.mk b/hw/bsp/stm32f4/boards/stm32f411disco/board.mk
new file mode 100644
index 000000000..48272acff
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f411disco/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DSTM32F411xE
+
+LD_FILE = $(BOARD_PATH)/STM32F411VETx_FLASH.ld
+
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
+
+# For flash-jlink target
+JLINK_DEVICE = stm32f411ve
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stm32f411disco/stm32f4xx_hal_conf.h b/hw/bsp/stm32f4/boards/stm32f411disco/stm32f4xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stm32f411disco/stm32f4xx_hal_conf.h
rename to hw/bsp/stm32f4/boards/stm32f411disco/stm32f4xx_hal_conf.h
diff --git a/hw/bsp/stm32f412disco/STM32F412ZGTx_FLASH.ld b/hw/bsp/stm32f4/boards/stm32f412disco/STM32F412ZGTx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f412disco/STM32F412ZGTx_FLASH.ld
rename to hw/bsp/stm32f4/boards/stm32f412disco/STM32F412ZGTx_FLASH.ld
diff --git a/hw/bsp/stm32f4/boards/stm32f412disco/board.h b/hw/bsp/stm32f4/boards/stm32f412disco/board.h
new file mode 100644
index 000000000..7f4a4fa15
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f412disco/board.h
@@ -0,0 +1,118 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// LED
+#define LED_PORT              GPIOE
+#define LED_PIN               GPIO_PIN_2
+#define LED_STATE_ON          0
+
+// Button
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   1
+
+// UART Enable PA2 as the debug log UART
+#define UART_DEV              USART2
+#define UART_GPIO_PORT        GPIOA
+#define UART_GPIO_AF          GPIO_AF7_USART2
+#define UART_TX_PIN           GPIO_PIN_2
+#define UART_RX_PIN           GPIO_PIN_3
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the
+   * device is clocked below the maximum system frequency, to update the
+   * voltage scaling value regarding system frequency refer to product
+   * datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 200;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 7;
+  RCC_OscInitStruct.PLL.PLLR = 2;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Select PLLSAI output as USB clock source */
+  PeriphClkInitStruct.PLLI2S.PLLI2SM = 8;
+  PeriphClkInitStruct.PLLI2S.PLLI2SQ = 4;
+  PeriphClkInitStruct.PLLI2S.PLLI2SN = 192;
+  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CK48;
+  PeriphClkInitStruct.Clk48ClockSelection = RCC_CK48CLKSOURCE_PLLI2SQ;
+  PeriphClkInitStruct.PLLI2SSelection = RCC_PLLI2SCLKSOURCE_PLLSRC;
+  PeriphClkInitStruct.PLLI2S.PLLI2SR = 7;
+  HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+   * clocks dividers */
+  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK |
+                                RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
+
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3);
+
+  // Enable clocks for LED, Button, Uart
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+  __HAL_RCC_GPIOE_CLK_ENABLE();
+  __HAL_RCC_USART2_CLK_ENABLE();
+}
+
+static inline void board_vbus_sense_init(void)
+{
+  // Enable VBUS sense (B device) via pin PA9
+  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f4/boards/stm32f412disco/board.mk b/hw/bsp/stm32f4/boards/stm32f412disco/board.mk
new file mode 100644
index 000000000..50973f737
--- /dev/null
+++ b/hw/bsp/stm32f4/boards/stm32f412disco/board.mk
@@ -0,0 +1,11 @@
+CFLAGS += -DSTM32F412Zx
+
+LD_FILE = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
+
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
+
+# For flash-jlink target
+JLINK_DEVICE = stm32f412zg
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stm32f412disco/stm32f4xx_hal_conf.h b/hw/bsp/stm32f4/boards/stm32f412disco/stm32f4xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stm32f412disco/stm32f4xx_hal_conf.h
rename to hw/bsp/stm32f4/boards/stm32f412disco/stm32f4xx_hal_conf.h
diff --git a/hw/bsp/stm32f411disco/stm32f411disco.c b/hw/bsp/stm32f4/family.c
similarity index 58%
rename from hw/bsp/stm32f411disco/stm32f411disco.c
rename to hw/bsp/stm32f4/family.c
index 5d432fe23..e10b24505 100644
--- a/hw/bsp/stm32f411disco/stm32f411disco.c
+++ b/hw/bsp/stm32f4/family.c
@@ -24,8 +24,9 @@
  * This file is part of the TinyUSB stack.
  */
 
-#include "../board.h"
 #include "stm32f4xx_hal.h"
+#include "bsp/board.h"
+#include "board.h"
 
 //--------------------------------------------------------------------+
 // Forward USB interrupt events to TinyUSB IRQ Handler
@@ -38,91 +39,12 @@ void OTG_FS_IRQHandler(void)
 //--------------------------------------------------------------------+
 // MACRO TYPEDEF CONSTANT ENUM
 //--------------------------------------------------------------------+
-
-// Orange LED
-#define LED_PORT              GPIOD
-#define LED_PIN               GPIO_PIN_13
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOA
-#define BUTTON_PIN            GPIO_PIN_0
-#define BUTTON_STATE_ACTIVE   1
-
-// Enable PA2 as the debug log UART
-#define UARTx                 USART2
-#define UART_GPIO_PORT        GPIOA
-#define UART_GPIO_AF          GPIO_AF7_USART2
-#define UART_TX_PIN           GPIO_PIN_2
-#define UART_RX_PIN           GPIO_PIN_3
-
 UART_HandleTypeDef UartHandle;
 
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-, Button
-  __HAL_RCC_GPIOD_CLK_ENABLE();  // LED
-  __HAL_RCC_USART2_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 84000000
-  *            HCLK(Hz)                       = 84000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 2
-  *            APB2 Prescaler                 = 1
-  *            HSE Frequency(Hz)              = 8000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 336
-  *            PLL_P                          = 4
-  *            PLL_Q                          = 7
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale2 mode
-  *            Flash Latency(WS)              = 2
-  * @param  None
-  * @retval None
-  */
-static void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 336;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
-  RCC_OscInitStruct.PLL.PLLQ = 7;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
-     clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2);
-}
-
 void board_init(void)
 {
-  SystemClock_Config();
-  all_rcc_clk_enable();
+  board_clock_init();
+  //SystemCoreClockUpdate();
 
 #if CFG_TUSB_OS == OPT_OS_NONE
   // 1ms tick timer
@@ -138,7 +60,7 @@ void board_init(void)
   GPIO_InitStruct.Pin = LED_PIN;
   GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
   GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
   HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
 
   board_led_write(false);
@@ -146,11 +68,35 @@ void board_init(void)
   // Button
   GPIO_InitStruct.Pin = BUTTON_PIN;
   GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
+  GPIO_InitStruct.Pull = BUTTON_STATE_ACTIVE ? GPIO_PULLDOWN : GPIO_PULLUP;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
   HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
 
+#ifdef UART_DEV
+  // UART
+  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_PULLUP;
+  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
+  GPIO_InitStruct.Alternate = UART_GPIO_AF;
+  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
+
+  UartHandle = (UART_HandleTypeDef){
+    .Instance        = UART_DEV,
+    .Init.BaudRate   = CFG_BOARD_UART_BAUDRATE,
+    .Init.WordLength = UART_WORDLENGTH_8B,
+    .Init.StopBits   = UART_STOPBITS_1,
+    .Init.Parity     = UART_PARITY_NONE,
+    .Init.HwFlowCtl  = UART_HWCONTROL_NONE,
+    .Init.Mode       = UART_MODE_TX_RX,
+    .Init.OverSampling = UART_OVERSAMPLING_16
+  };
+  HAL_UART_Init(&UartHandle);
+#endif
+
   /* Configure USB FS GPIOs */
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+
   /* Configure USB D+ D- Pins */
   GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
   GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
@@ -165,7 +111,7 @@ void board_init(void)
   GPIO_InitStruct.Pull = GPIO_NOPULL;
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
-  /* This for ID line debug */
+  /* ID Pin */
   GPIO_InitStruct.Pin = GPIO_PIN_10;
   GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
   GPIO_InitStruct.Pull = GPIO_PULLUP;
@@ -173,31 +119,19 @@ void board_init(void)
   GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
-
-  UartHandle = (UART_HandleTypeDef){
-    .Instance        = UARTx,
-    .Init.BaudRate   = CFG_BOARD_UART_BAUDRATE,
-    .Init.WordLength = UART_WORDLENGTH_8B,
-    .Init.StopBits   = UART_STOPBITS_1,
-    .Init.Parity     = UART_PARITY_NONE,
-    .Init.HwFlowCtl  = UART_HWCONTROL_NONE,
-    .Init.Mode       = UART_MODE_TX_RX,
-    .Init.OverSampling = UART_OVERSAMPLING_16
-  };
-  HAL_UART_Init(&UartHandle);
+#ifdef STM32F412Zx
+  /* Configure POWER_SWITCH IO pin */
+  __HAL_RCC_GPIOG_CLK_ENABLE();
+  GPIO_InitStruct.Pin = GPIO_PIN_8;
+  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
+  GPIO_InitStruct.Pull = GPIO_NOPULL;
+  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
+#endif
 
   // Enable USB OTG clock
   __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
 
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
+  board_vbus_sense_init();
 }
 
 //--------------------------------------------------------------------+
@@ -222,8 +156,13 @@ int board_uart_read(uint8_t* buf, int len)
 
 int board_uart_write(void const * buf, int len)
 {
+#ifdef UART_DEV
   HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
   return len;
+#else
+  (void) buf; (void) len; (void) UartHandle;
+  return 0;
+#endif
 }
 
 #if CFG_TUSB_OS  == OPT_OS_NONE
diff --git a/hw/bsp/stm32f412disco/board.mk b/hw/bsp/stm32f4/family.mk
similarity index 81%
rename from hw/bsp/stm32f412disco/board.mk
rename to hw/bsp/stm32f4/family.mk
index 9356f344d..89e28174f 100644
--- a/hw/bsp/stm32f412disco/board.mk
+++ b/hw/bsp/stm32f4/family.mk
@@ -1,3 +1,5 @@
+include $(TOP)/$(BOARD_PATH)/board.mk
+
 CFLAGS += \
   -flto \
   -mthumb \
@@ -6,7 +8,6 @@ CFLAGS += \
   -mfloat-abi=hard \
   -mfpu=fpv4-sp-d16 \
   -nostdlib -nostartfiles \
-  -DSTM32F412Zx \
   -DCFG_TUSB_MCU=OPT_MCU_STM32F4
 
 # suppress warning caused by vendor mcu driver
@@ -16,9 +17,6 @@ ST_FAMILY = f4
 ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
 ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F412ZGTx_FLASH.ld
-
 SRC_C += \
 	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
@@ -28,10 +26,8 @@ SRC_C += \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c
 
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
-
 INC += \
+	$(TOP)/$(BOARD_PATH) \
 	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
 	$(TOP)/$(ST_CMSIS)/Include \
 	$(TOP)/$(ST_HAL_DRIVER)/Inc \
@@ -44,8 +40,5 @@ CHIP_FAMILY = synopsys
 # For freeRTOS port source
 FREERTOS_PORT = ARM_CM4F
 
-# For flash-jlink target
-JLINK_DEVICE = stm32f41zx
-
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f401blackpill/board.mk b/hw/bsp/stm32f401blackpill/board.mk
deleted file mode 100644
index 522b02774..000000000
--- a/hw/bsp/stm32f401blackpill/board.mk
+++ /dev/null
@@ -1,47 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F401xC \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F4
-
-ST_FAMILY = f4
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F401VCTx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f401xc.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = stm32f401cc
-
-# flash target ROM bootloader
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<
diff --git a/hw/bsp/stm32f401blackpill/stm32f401blackpill.c b/hw/bsp/stm32f401blackpill/stm32f401blackpill.c
deleted file mode 100644
index f9daa364f..000000000
--- a/hw/bsp/stm32f401blackpill/stm32f401blackpill.c
+++ /dev/null
@@ -1,226 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f4xx.h"
-#include "stm32f4xx_hal_conf.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOC
-#define LED_PIN               GPIO_PIN_13
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOA
-#define BUTTON_PIN            GPIO_PIN_0
-#define BUTTON_STATE_ACTIVE   0
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-, Button
-  __HAL_RCC_GPIOC_CLK_ENABLE();  // LED
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 84000000
-  *            HCLK(Hz)                       = 84000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 2
-  *            APB2 Prescaler                 = 1
-  *            HSE Frequency(Hz)              = 25000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 336
-  *            PLL_P                          = 4
-  *            PLL_Q                          = 7
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale2 mode
-  *            Flash Latency(WS)              = 2
-  * @param  None
-  * @retval None
-  */
-static void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 336;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
-  RCC_OscInitStruct.PLL.PLLQ = 7;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
-     clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2);
-}
-
-void board_init(void)
-{
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  //NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-  
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  board_led_write(false);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = BUTTON_STATE_ACTIVE ? GPIO_PULLDOWN : GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  /* Configure USB FS GPIOs */
-  /* Configure USB D+ D- Pins */
-  GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* This for ID line debug */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  // Enable USB OTG clock
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Blackpill doens't use VBUS sense (B device)
-  // explicitly disable it
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS;
-  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSBSEN;
-  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSASEN;
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/stm32f407disco/board.mk b/hw/bsp/stm32f407disco/board.mk
deleted file mode 100644
index 76e13af32..000000000
--- a/hw/bsp/stm32f407disco/board.mk
+++ /dev/null
@@ -1,50 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F407xx \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F4
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-align
-
-ST_FAMILY = f4
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F407VGTx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f407xx.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = stm32f407vg
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/stm32f407disco/stm32f407disco.c b/hw/bsp/stm32f407disco/stm32f407disco.c
deleted file mode 100644
index ce3b67da0..000000000
--- a/hw/bsp/stm32f407disco/stm32f407disco.c
+++ /dev/null
@@ -1,254 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f4xx_hal.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOD
-#define LED_PIN               GPIO_PIN_14
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOA
-#define BUTTON_PIN            GPIO_PIN_0
-#define BUTTON_STATE_ACTIVE   1
-
-// Enable PA2 as the debug log UART
-// It is not routed to the ST/Link on the Discovery board.
-#define UARTx                 USART2
-#define UART_GPIO_PORT        GPIOA
-#define UART_GPIO_AF          GPIO_AF7_USART2
-#define UART_TX_PIN           GPIO_PIN_2
-#define UART_RX_PIN           GPIO_PIN_3
-
-UART_HandleTypeDef UartHandle;
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-, Button
-  __HAL_RCC_GPIOD_CLK_ENABLE();  // LED
-  __HAL_RCC_USART2_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 168000000
-  *            HCLK(Hz)                       = 168000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 8000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 336
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 7
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 5
-  * @param  None
-  * @retval None
-  */
-static void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 336;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 7;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
-     clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
-}
-
-void board_init(void)
-{
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  //NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  board_led_write(false);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  // USB Pin Init
-  // PA9- VUSB, PA10- ID, PA11- DM, PA12- DP
-  /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* This for ID line debug */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
-
-  UartHandle = (UART_HandleTypeDef){
-    .Instance        = UARTx,
-    .Init.BaudRate   = CFG_BOARD_UART_BAUDRATE,
-    .Init.WordLength = UART_WORDLENGTH_8B,
-    .Init.StopBits   = UART_STOPBITS_1,
-    .Init.Parity     = UART_PARITY_NONE,
-    .Init.HwFlowCtl  = UART_HWCONTROL_NONE,
-    .Init.Mode       = UART_MODE_TX_RX,
-    .Init.OverSampling = UART_OVERSAMPLING_16
-  };
-  HAL_UART_Init(&UartHandle);
-
-  // Enable USB OTG clock
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
-  return len;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/stm32f411blackpill/board.mk b/hw/bsp/stm32f411blackpill/board.mk
deleted file mode 100644
index 5800331d9..000000000
--- a/hw/bsp/stm32f411blackpill/board.mk
+++ /dev/null
@@ -1,47 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F411xE \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F4
-
-ST_FAMILY = f4
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F411CEUx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = stm32f411ce
-
-# flash target ROM bootloader
-flash: $(BUILD)/$(BOARD)-firmware.bin
-	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<
diff --git a/hw/bsp/stm32f411blackpill/stm32f411blackpill.c b/hw/bsp/stm32f411blackpill/stm32f411blackpill.c
deleted file mode 100644
index af1cf70ed..000000000
--- a/hw/bsp/stm32f411blackpill/stm32f411blackpill.c
+++ /dev/null
@@ -1,225 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f4xx_hal.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOC
-#define LED_PIN               GPIO_PIN_13
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOA
-#define BUTTON_PIN            GPIO_PIN_0
-#define BUTTON_STATE_ACTIVE   0
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-, Button
-  __HAL_RCC_GPIOC_CLK_ENABLE();  // LED
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 84000000
-  *            HCLK(Hz)                       = 84000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 2
-  *            APB2 Prescaler                 = 1
-  *            HSE Frequency(Hz)              = 25000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 336
-  *            PLL_P                          = 4
-  *            PLL_Q                          = 7
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale2 mode
-  *            Flash Latency(WS)              = 2
-  * @param  None
-  * @retval None
-  */
-static void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 336;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
-  RCC_OscInitStruct.PLL.PLLQ = 7;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
-     clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2);
-}
-
-void board_init(void)
-{
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  //NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  board_led_write(false);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = BUTTON_STATE_ACTIVE ? GPIO_PULLDOWN : GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  /* Configure USB FS GPIOs */
-  /* Configure USB D+ D- Pins */
-  GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* This for ID line debug */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  // Enable USB OTG clock
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Blackpill doens't use VBUS sense (B device)
-  // explicitly disable it
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS;
-  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSBSEN;
-  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSASEN;
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/stm32f411disco/board.mk b/hw/bsp/stm32f411disco/board.mk
deleted file mode 100644
index e13bf641e..000000000
--- a/hw/bsp/stm32f411disco/board.mk
+++ /dev/null
@@ -1,50 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F411xE \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F4
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-align
-
-ST_FAMILY = f4
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F411VETx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = stm32f411ve
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/stm32f412disco/stm32f412disco.c b/hw/bsp/stm32f412disco/stm32f412disco.c
deleted file mode 100644
index 669891d68..000000000
--- a/hw/bsp/stm32f412disco/stm32f412disco.c
+++ /dev/null
@@ -1,277 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f4xx_hal.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOE
-#define LED_PIN               GPIO_PIN_2
-#define LED_STATE_ON          0
-
-#define BUTTON_PORT           GPIOA
-#define BUTTON_PIN            GPIO_PIN_0
-#define BUTTON_STATE_ACTIVE   1
-
-// Enable PA2 as the debug log UART
-#define UARTx                 USART2
-#define UART_GPIO_PORT        GPIOA
-#define UART_GPIO_AF          GPIO_AF7_USART2
-#define UART_TX_PIN           GPIO_PIN_2
-#define UART_RX_PIN           GPIO_PIN_3
-
-UART_HandleTypeDef UartHandle;
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-, Button
-  __HAL_RCC_GPIOE_CLK_ENABLE();  // LED
-  __HAL_RCC_USART2_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 100000000
-  *            HCLK(Hz)                       = 100000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 2
-  *            APB2 Prescaler                 = 1
-  *            HSE Frequency(Hz)              = 8000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 200
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 7
-  *            PLL_R                          = 2
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 3
-  *         The USB clock configuration from PLLI2S:
-  *            PLLI2SM                        = 8
-  *            PLLI2SN                        = 192
-  *            PLLI2SQ                        = 4
-  * @param  None
-  * @retval None
-  */
-static void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the
-   * device is clocked below the maximum system frequency, to update the
-   * voltage scaling value regarding system frequency refer to product
-   * datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 200;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 7;
-  RCC_OscInitStruct.PLL.PLLR = 2;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Select PLLSAI output as USB clock source */
-  PeriphClkInitStruct.PLLI2S.PLLI2SM = 8;
-  PeriphClkInitStruct.PLLI2S.PLLI2SQ = 4;
-  PeriphClkInitStruct.PLLI2S.PLLI2SN = 192;
-  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CK48;
-  PeriphClkInitStruct.Clk48ClockSelection = RCC_CK48CLKSOURCE_PLLI2SQ;
-  PeriphClkInitStruct.PLLI2SSelection = RCC_PLLI2SCLKSOURCE_PLLSRC;
-  PeriphClkInitStruct.PLLI2S.PLLI2SR = 7;
-  HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
-   * clocks dividers */
-  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK |
-                                RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
-
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3);
-}
-
-void board_init(void)
-{
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  //NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  board_led_write(false);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  /* Configure USB FS GPIOs */
-  /* Configure USB D+ D- Pins */
-  GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* ID Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure POWER_SWITCH IO pin */
-  __HAL_RCC_GPIOG_CLK_ENABLE();
-  GPIO_InitStruct.Pin = GPIO_PIN_8;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
-
-  UartHandle = (UART_HandleTypeDef){
-    .Instance        = UARTx,
-    .Init.BaudRate   = CFG_BOARD_UART_BAUDRATE,
-    .Init.WordLength = UART_WORDLENGTH_8B,
-    .Init.StopBits   = UART_STOPBITS_1,
-    .Init.Parity     = UART_PARITY_NONE,
-    .Init.HwFlowCtl  = UART_HWCONTROL_NONE,
-    .Init.Mode       = UART_MODE_TX_RX,
-    .Init.OverSampling = UART_OVERSAMPLING_16
-  };
-  HAL_UART_Init(&UartHandle);
-
-  // Enable USB OTG clock
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
-  return len;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/stlinkv3mini/STM32F723xE_FLASH.ld b/hw/bsp/stm32f7/boards/stlinkv3mini/STM32F723xE_FLASH.ld
similarity index 100%
rename from hw/bsp/stlinkv3mini/STM32F723xE_FLASH.ld
rename to hw/bsp/stm32f7/boards/stlinkv3mini/STM32F723xE_FLASH.ld
diff --git a/hw/bsp/stm32f7/boards/stlinkv3mini/board.h b/hw/bsp/stm32f7/boards/stlinkv3mini/board.h
new file mode 100644
index 000000000..d0ef6625f
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stlinkv3mini/board.h
@@ -0,0 +1,101 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define LED_PORT              GPIOA
+#define LED_PIN               GPIO_PIN_10
+#define LED_STATE_ON          1
+
+// No physical button is populated
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   1
+
+#define UART_DEV              USART6
+#define UART_CLK_EN           __HAL_RCC_USART6_CLK_ENABLE
+#define UART_GPIO_AF          GPIO_AF8_USART6
+
+#define UART_TX_PORT          GPIOG
+#define UART_TX_PIN           GPIO_PIN_9
+
+#define UART_RX_PORT          GPIOG
+#define UART_RX_PIN           GPIO_PIN_14
+
+// VBUS Sense detection
+#define OTG_FS_VBUS_SENSE     1
+#define OTG_HS_VBUS_SENSE     0
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 432;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 9;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Activate the OverDrive to reach the 216 MHz Frequency */
+  HAL_PWREx_EnableOverDrive();
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk b/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk
new file mode 100644
index 000000000..a18b3231d
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk
@@ -0,0 +1,14 @@
+# Only OTG-HS has a connector on this board
+PORT ?= 1
+SPEED ?= high
+
+CFLAGS += \
+  -DSTM32F723xx \
+  -DHSE_VALUE=25000000 \
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/STM32F723xE_FLASH.ld
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stlinkv3mini/stm32f7xx_hal_conf.h b/hw/bsp/stm32f7/boards/stlinkv3mini/stm32f7xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stlinkv3mini/stm32f7xx_hal_conf.h
rename to hw/bsp/stm32f7/boards/stlinkv3mini/stm32f7xx_hal_conf.h
diff --git a/hw/bsp/stm32f723disco/STM32F723xE_FLASH.ld b/hw/bsp/stm32f7/boards/stm32f723disco/STM32F723xE_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f723disco/STM32F723xE_FLASH.ld
rename to hw/bsp/stm32f7/boards/stm32f723disco/STM32F723xE_FLASH.ld
diff --git a/hw/bsp/stm32f7/boards/stm32f723disco/board.h b/hw/bsp/stm32f7/boards/stm32f723disco/board.h
new file mode 100644
index 000000000..93d83efc6
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f723disco/board.h
@@ -0,0 +1,105 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define LED_PORT              GPIOB
+#define LED_PIN               GPIO_PIN_1
+#define LED_STATE_ON          1
+
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   1
+
+#define UART_DEV              USART6
+#define UART_CLK_EN           __HAL_RCC_USART6_CLK_ENABLE
+#define UART_GPIO_AF          GPIO_AF8_USART6
+
+#define UART_TX_PORT          GPIOC
+#define UART_TX_PIN           GPIO_PIN_6
+
+#define UART_RX_PORT          GPIOC
+#define UART_RX_PIN           GPIO_PIN_7
+
+// VBUS Sense detection
+#define OTG_FS_VBUS_SENSE     1
+#define OTG_HS_VBUS_SENSE     0
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 432;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 9;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Activate the OverDrive to reach the 216 MHz Frequency */
+  HAL_PWREx_EnableOverDrive();
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
+}
+
+//static inline void board_vbus_sense_init(void)
+//{
+//
+//}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f7/boards/stm32f723disco/board.mk b/hw/bsp/stm32f7/boards/stm32f723disco/board.mk
new file mode 100644
index 000000000..8f05199d0
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f723disco/board.mk
@@ -0,0 +1,12 @@
+PORT ?= 1
+SPEED ?= high
+
+CFLAGS += \
+  -DSTM32F723xx \
+  -DHSE_VALUE=25000000 \
+
+LD_FILE = $(BOARD_PATH)/STM32F723xE_FLASH.ld
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stm32f723disco/stm32f7xx_hal_conf.h b/hw/bsp/stm32f7/boards/stm32f723disco/stm32f7xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stm32f723disco/stm32f7xx_hal_conf.h
rename to hw/bsp/stm32f7/boards/stm32f723disco/stm32f7xx_hal_conf.h
diff --git a/hw/bsp/stm32f746disco/STM32F746ZGTx_FLASH.ld b/hw/bsp/stm32f7/boards/stm32f746disco/STM32F746ZGTx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f746disco/STM32F746ZGTx_FLASH.ld
rename to hw/bsp/stm32f7/boards/stm32f746disco/STM32F746ZGTx_FLASH.ld
diff --git a/hw/bsp/stm32f7/boards/stm32f746disco/board.h b/hw/bsp/stm32f7/boards/stm32f746disco/board.h
new file mode 100644
index 000000000..ee342b9f5
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f746disco/board.h
@@ -0,0 +1,100 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define LED_PORT              GPIOI
+#define LED_PIN               GPIO_PIN_1
+#define LED_STATE_ON          1
+
+#define BUTTON_PORT           GPIOI
+#define BUTTON_PIN            GPIO_PIN_11
+#define BUTTON_STATE_ACTIVE   1
+
+#define UART_DEV              USART1
+#define UART_CLK_EN           __HAL_RCC_USART1_CLK_ENABLE
+#define UART_GPIO_AF          GPIO_AF7_USART1
+
+#define UART_TX_PORT          GPIOA
+#define UART_TX_PIN           GPIO_PIN_9
+
+#define UART_RX_PORT          GPIOB
+#define UART_RX_PIN           GPIO_PIN_7
+
+// VBUS Sense detection
+#define OTG_FS_VBUS_SENSE     0
+#define OTG_HS_VBUS_SENSE     0
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 432;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 9;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Activate the OverDrive to reach the 216 MHz Frequency */
+  HAL_PWREx_EnableOverDrive();
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f7/boards/stm32f746disco/board.mk b/hw/bsp/stm32f7/boards/stm32f746disco/board.mk
new file mode 100644
index 000000000..2ba59f67a
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f746disco/board.mk
@@ -0,0 +1,12 @@
+PORT ?= 1
+SPEED ?= high
+
+CFLAGS += \
+  -DSTM32F746xx \
+  -DHSE_VALUE=25000000
+
+LD_FILE = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stm32f746disco/stm32f7xx_hal_conf.h b/hw/bsp/stm32f7/boards/stm32f746disco/stm32f7xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stm32f746disco/stm32f7xx_hal_conf.h
rename to hw/bsp/stm32f7/boards/stm32f746disco/stm32f7xx_hal_conf.h
diff --git a/hw/bsp/stm32f746nucleo/STM32F746ZGTx_FLASH.ld b/hw/bsp/stm32f7/boards/stm32f746nucleo/STM32F746ZGTx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f746nucleo/STM32F746ZGTx_FLASH.ld
rename to hw/bsp/stm32f7/boards/stm32f746nucleo/STM32F746ZGTx_FLASH.ld
diff --git a/hw/bsp/stm32f7/boards/stm32f746nucleo/board.h b/hw/bsp/stm32f7/boards/stm32f746nucleo/board.h
new file mode 100644
index 000000000..093445ede
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f746nucleo/board.h
@@ -0,0 +1,96 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define LED_PORT              GPIOB
+#define LED_PIN               GPIO_PIN_14
+#define LED_STATE_ON          1
+
+#define BUTTON_PORT           GPIOC
+#define BUTTON_PIN            GPIO_PIN_13
+#define BUTTON_STATE_ACTIVE   1
+
+#define UART_DEV              USART3
+#define UART_CLK_EN           __HAL_RCC_USART3_CLK_ENABLE
+#define UART_GPIO_AF          GPIO_AF7_USART3
+
+#define UART_TX_PORT          GPIOD
+#define UART_TX_PIN           GPIO_PIN_8
+#define UART_RX_PORT          GPIOD
+#define UART_RX_PIN           GPIO_PIN_9
+
+// VBUS Sense detection
+#define OTG_FS_VBUS_SENSE     1
+#define OTG_HS_VBUS_SENSE     0
+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 432;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 9;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Activate the OverDrive to reach the 216 MHz Frequency */
+  HAL_PWREx_EnableOverDrive();
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk b/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk
new file mode 100644
index 000000000..3dcf4817e
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk
@@ -0,0 +1,12 @@
+PORT ?= 0
+SPEED ?= full
+
+CFLAGS += \
+  -DSTM32F746xx \
+  -DHSE_VALUE=8000000
+
+LD_FILE = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stm32f746nucleo/stm32f7xx_hal_conf.h b/hw/bsp/stm32f7/boards/stm32f746nucleo/stm32f7xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stm32f746nucleo/stm32f7xx_hal_conf.h
rename to hw/bsp/stm32f7/boards/stm32f746nucleo/stm32f7xx_hal_conf.h
diff --git a/hw/bsp/stm32f767nucleo/STM32F767ZITx_FLASH.ld b/hw/bsp/stm32f7/boards/stm32f767nucleo/STM32F767ZITx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f767nucleo/STM32F767ZITx_FLASH.ld
rename to hw/bsp/stm32f7/boards/stm32f767nucleo/STM32F767ZITx_FLASH.ld
diff --git a/hw/bsp/stm32f7/boards/stm32f767nucleo/board.h b/hw/bsp/stm32f7/boards/stm32f767nucleo/board.h
new file mode 100644
index 000000000..1283f2313
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f767nucleo/board.h
@@ -0,0 +1,102 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define LED_PORT              GPIOB
+#define LED_PIN               GPIO_PIN_14
+#define LED_STATE_ON          1
+
+#define BUTTON_PORT           GPIOC
+#define BUTTON_PIN            GPIO_PIN_13
+#define BUTTON_STATE_ACTIVE   1
+
+#define UART_DEV              USART3
+#define UART_CLK_EN           __HAL_RCC_USART3_CLK_ENABLE
+#define UART_GPIO_AF          GPIO_AF7_USART3
+
+#define UART_TX_PORT          GPIOD
+#define UART_TX_PIN           GPIO_PIN_8
+
+#define UART_RX_PORT          GPIOD
+#define UART_RX_PIN           GPIO_PIN_9
+
+// VBUS Sense detection
+#define OTG_FS_VBUS_SENSE     1
+#define OTG_HS_VBUS_SENSE     0
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 432;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 9;
+  RCC_OscInitStruct.PLL.PLLR = 7;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Activate the OverDrive to reach the 216 MHz Frequency */
+  HAL_PWREx_EnableOverDrive();
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
+}
+
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk b/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk
new file mode 100644
index 000000000..2400a4ba7
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk
@@ -0,0 +1,12 @@
+PORT ?= 0
+SPEED ?= full 
+
+CFLAGS += \
+  -DSTM32F767xx \
+	-DHSE_VALUE=8000000 \
+
+LD_FILE = $(BOARD_PATH)/STM32F767ZITx_FLASH.ld
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f767xx.s
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stm32f767nucleo/stm32f7xx_hal_conf.h b/hw/bsp/stm32f7/boards/stm32f767nucleo/stm32f7xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stm32f767nucleo/stm32f7xx_hal_conf.h
rename to hw/bsp/stm32f7/boards/stm32f767nucleo/stm32f7xx_hal_conf.h
diff --git a/hw/bsp/stm32f769disco/STM32F769ZITx_FLASH.ld b/hw/bsp/stm32f7/boards/stm32f769disco/STM32F769ZITx_FLASH.ld
similarity index 100%
rename from hw/bsp/stm32f769disco/STM32F769ZITx_FLASH.ld
rename to hw/bsp/stm32f7/boards/stm32f769disco/STM32F769ZITx_FLASH.ld
diff --git a/hw/bsp/stm32f7/boards/stm32f769disco/board.h b/hw/bsp/stm32f7/boards/stm32f769disco/board.h
new file mode 100644
index 000000000..5ec217f5f
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f769disco/board.h
@@ -0,0 +1,101 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define LED_PORT              GPIOJ
+#define LED_PIN               GPIO_PIN_12
+#define LED_STATE_ON          5
+
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   1
+
+#define UART_DEV              USART1
+#define UART_CLK_EN           __HAL_RCC_USART1_CLK_ENABLE
+#define UART_GPIO_AF          GPIO_AF7_USART1
+
+#define UART_TX_PORT          GPIOA
+#define UART_TX_PIN           GPIO_PIN_9
+
+#define UART_RX_PORT          GPIOA
+#define UART_RX_PIN           GPIO_PIN_10
+
+// VBUS Sense detection
+#define OTG_FS_VBUS_SENSE     1
+#define OTG_HS_VBUS_SENSE     0
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+  RCC_OscInitStruct.PLL.PLLN = 432;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = 9;
+  RCC_OscInitStruct.PLL.PLLR = 7;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Activate the OverDrive to reach the 216 MHz Frequency */
+  HAL_PWREx_EnableOverDrive();
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */
diff --git a/hw/bsp/stm32f7/boards/stm32f769disco/board.mk b/hw/bsp/stm32f7/boards/stm32f769disco/board.mk
new file mode 100644
index 000000000..45b4a78c7
--- /dev/null
+++ b/hw/bsp/stm32f7/boards/stm32f769disco/board.mk
@@ -0,0 +1,13 @@
+# Only OTG-HS has a connector on this board
+PORT ?= 1
+SPEED ?= high
+
+CFLAGS += \
+  -DSTM32F769xx \
+  -DHSE_VALUE=25000000 \
+
+LD_FILE = $(BOARD_PATH)/STM32F769ZITx_FLASH.ld
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f769xx.s
+
+# flash target using on-board stlink
+flash: flash-stlink
diff --git a/hw/bsp/stm32f769disco/stm32f7xx_hal_conf.h b/hw/bsp/stm32f7/boards/stm32f769disco/stm32f7xx_hal_conf.h
similarity index 100%
rename from hw/bsp/stm32f769disco/stm32f7xx_hal_conf.h
rename to hw/bsp/stm32f7/boards/stm32f769disco/stm32f7xx_hal_conf.h
diff --git a/hw/bsp/stm32f723disco/stm32f723disco.c b/hw/bsp/stm32f7/family.c
similarity index 54%
rename from hw/bsp/stm32f723disco/stm32f723disco.c
rename to hw/bsp/stm32f7/family.c
index eeedd2a66..1649e935f 100644
--- a/hw/bsp/stm32f723disco/stm32f723disco.c
+++ b/hw/bsp/stm32f7/family.c
@@ -1,7 +1,8 @@
 /*
  * The MIT License (MIT)
  *
- * Copyright (c) 2020 Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de),
+ * Copyright (c) 2019 William D. Jones (thor0505@comcast.net),
+ * Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de),
  * Ha Thach (tinyusb.org)
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -25,9 +26,9 @@
  * This file is part of the TinyUSB stack.
  */
 
-#include "../board.h"
-
 #include "stm32f7xx_hal.h"
+#include "bsp/board.h"
+#include "board.h"
 
 //--------------------------------------------------------------------+
 // Forward USB interrupt events to TinyUSB IRQ Handler
@@ -44,104 +45,30 @@ void OTG_HS_IRQHandler(void)
   tud_int_handler(1);
 }
 
-
 //--------------------------------------------------------------------+
 // MACRO TYPEDEF CONSTANT ENUM
 //--------------------------------------------------------------------+
 
-#define LED_PORT              GPIOB
-#define LED_PIN               GPIO_PIN_1
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOA
-#define BUTTON_PIN            GPIO_PIN_0
-#define BUTTON_STATE_ACTIVE   1
-
-#define UARTx                 USART6
-#define UART_GPIO_PORT        GPIOC
-#define UART_GPIO_AF          GPIO_AF8_USART6
-#define UART_TX_PIN           GPIO_PIN_6
-#define UART_RX_PIN           GPIO_PIN_7
-
 UART_HandleTypeDef UartHandle;
 
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-
-  __HAL_RCC_GPIOB_CLK_ENABLE();  // LED, OTG_HS
-  __HAL_RCC_GPIOC_CLK_ENABLE();  // Button
-  __HAL_RCC_GPIOD_CLK_ENABLE();  // Uart tx, rx
-  __HAL_RCC_USART6_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 216000000
-  *            HCLK(Hz)                       = 216000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 25000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 432
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 9
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 7
-  *         The USB clock configuration from PLLSAI:
-  *            PLLSAIP                        = 8
-  *            PLLSAIN                        = 384
-  *            PLLSAIQ                        = 7
-  * @param  None
-  * @retval None
-  */
-void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 432;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 9;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Activate the OverDrive to reach the 216 MHz Frequency */
-  HAL_PWREx_EnableOverDrive();
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
-}
-
 void board_init(void)
 {
+  board_clock_init();
 
+  // Enable peripherals clocks
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+  __HAL_RCC_GPIOB_CLK_ENABLE();
+  __HAL_RCC_GPIOC_CLK_ENABLE();
+  __HAL_RCC_GPIOD_CLK_ENABLE();
+  __HAL_RCC_GPIOG_CLK_ENABLE();
+  __HAL_RCC_GPIOH_CLK_ENABLE();  // ULPI NXT
+  __HAL_RCC_GPIOI_CLK_ENABLE();  // ULPI NXT
 
-  SystemClock_Config();
-  all_rcc_clk_enable();
+#ifdef __HAL_RCC_GPIOJ_CLK_ENABLE
+  __HAL_RCC_GPIOJ_CLK_ENABLE();
+#endif
+
+  UART_CLK_EN();
 
 #if CFG_TUSB_OS  == OPT_OS_NONE
   // 1ms tick timer
@@ -164,26 +91,35 @@ void board_init(void)
   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
   HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
 
-  // Uart
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
+  // Uart TX
+  GPIO_InitStruct.Pin       = UART_TX_PIN;
   GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
   GPIO_InitStruct.Pull      = GPIO_PULLUP;
   GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
   GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
+  HAL_GPIO_Init(UART_TX_PORT, &GPIO_InitStruct);
 
-  UartHandle.Instance        = UARTx;
-  UartHandle.Init.BaudRate   = CFG_BOARD_UART_BAUDRATE;
-  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
-  UartHandle.Init.StopBits   = UART_STOPBITS_1;
-  UartHandle.Init.Parity     = UART_PARITY_NONE;
-  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
-  UartHandle.Init.Mode       = UART_MODE_TX_RX;
+  // Uart RX
+  GPIO_InitStruct.Pin       = UART_RX_PIN;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_PULLUP;
+  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
+  GPIO_InitStruct.Alternate = UART_GPIO_AF;
+  HAL_GPIO_Init(UART_RX_PORT, &GPIO_InitStruct);
+
+  UartHandle.Instance          = UART_DEV;
+  UartHandle.Init.BaudRate     = CFG_BOARD_UART_BAUDRATE;
+  UartHandle.Init.WordLength   = UART_WORDLENGTH_8B;
+  UartHandle.Init.StopBits     = UART_STOPBITS_1;
+  UartHandle.Init.Parity       = UART_PARITY_NONE;
+  UartHandle.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
+  UartHandle.Init.Mode         = UART_MODE_TX_RX;
   UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
   HAL_UART_Init(&UartHandle);
 
 #if BOARD_DEVICE_RHPORT_NUM == 0
-  /* Configure USB FS GPIOs */
+  // OTG_FS
+
   /* Configure DM DP Pins */
   GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);
   GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
@@ -192,12 +128,6 @@ void board_init(void)
   GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
   /* Configure OTG-FS ID pin */
   GPIO_InitStruct.Pin = GPIO_PIN_10;
   GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
@@ -208,16 +138,35 @@ void board_init(void)
   /* Enable USB FS Clocks */
   __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
 
+#if OTG_FS_VBUS_SENSE
+  /* Configure VBUS Pin */
+  GPIO_InitStruct.Pin = GPIO_PIN_9;
+  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+  GPIO_InitStruct.Pull = GPIO_NOPULL;
+  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
   // Enable VBUS sense (B device) via pin PA9
   USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
+#else
+  // Disable VBUS sense (B device) via pin PA9
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
+
+  // B-peripheral session valid override enable
+  USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
+  USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
+#endif
 
 #else
-  /* Configure USB HS GPIOs */
+  // OTG_HS
+
+  #ifdef USB_HS_PHYC
+  // MCU with built-in HS PHY such as F723, F733, F730
+
   /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = (GPIO_PIN_14 | GPIO_PIN_15);
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+  GPIO_InitStruct.Pin       = (GPIO_PIN_14 | GPIO_PIN_15);
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_NOPULL;
+  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
   GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
   HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
@@ -225,31 +174,84 @@ void board_init(void)
   USB_OTG_HS->GCCFG |= USB_OTG_GCCFG_VBDEN;
 
   /* Configure OTG-HS ID pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_13;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
+  GPIO_InitStruct.Pin       = GPIO_PIN_13;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_OD;
+  GPIO_InitStruct.Pull      = GPIO_PULLUP;
   GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
   HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
 
   /* Enable PHYC Clocks */
   __HAL_RCC_OTGPHYC_CLK_ENABLE();
 
-  /* Enable USB HS Clocks */
-  __HAL_RCC_USB_OTG_HS_CLK_ENABLE();
-  __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
+  #else
+  // MUC with external ULPI PHY
 
-  // Enable VBUS sense (B device) via pin PA9
+  /* ULPI CLK */
+  GPIO_InitStruct.Pin       = GPIO_PIN_5;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_NOPULL;
+  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
+  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
+  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+  /* ULPI D0 */
+  GPIO_InitStruct.Pin       = GPIO_PIN_3;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_NOPULL;
+  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
+  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
+  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+  /* ULPI D1 D2 D3 D4 D5 D6 D7 */
+  GPIO_InitStruct.Pin       = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_5;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_NOPULL;
+  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
+  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+  /* ULPI STP */
+  GPIO_InitStruct.Pin       = GPIO_PIN_0 | GPIO_PIN_2;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_NOPULL;
+  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
+  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
+
+  /* NXT */
+  GPIO_InitStruct.Pin       = GPIO_PIN_4;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_NOPULL;
+  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
+  HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
+
+  /* ULPI DIR */
+  GPIO_InitStruct.Pin       = GPIO_PIN_11;
+  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull      = GPIO_NOPULL;
+  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
+  HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
+  #endif // USB_HS_PHYC
+
+  /* Enable USB HS & ULPI Clocks */
+  __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
+  __HAL_RCC_USB_OTG_HS_CLK_ENABLE();
+
+#if OTG_HS_VBUS_SENSE
+  #error OTG HS VBUS Sense enabled is not implemented
+#else
+  // No VBUS sense
   USB_OTG_HS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
 
   // B-peripheral session valid override enable
   USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
   USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
+#endif
 
   // Force device mode
   USB_OTG_HS->GUSBCFG &= ~USB_OTG_GUSBCFG_FHMOD;
   USB_OTG_HS->GUSBCFG |= USB_OTG_GUSBCFG_FDMOD;
 
-#endif
+#endif // BOARD_DEVICE_RHPORT_NUM
+
 }
 
 //--------------------------------------------------------------------+
diff --git a/hw/bsp/stm32f723disco/board.mk b/hw/bsp/stm32f7/family.mk
similarity index 82%
rename from hw/bsp/stm32f723disco/board.mk
rename to hw/bsp/stm32f7/family.mk
index b784c3742..b5f58cf93 100644
--- a/hw/bsp/stm32f723disco/board.mk
+++ b/hw/bsp/stm32f7/family.mk
@@ -1,5 +1,4 @@
-PORT ?= 1
-SPEED ?= high
+include $(TOP)/$(BOARD_PATH)/board.mk
 
 CFLAGS += \
   -flto \
@@ -9,8 +8,6 @@ CFLAGS += \
   -mfloat-abi=hard \
   -mfpu=fpv5-d16 \
   -nostdlib -nostartfiles \
-  -DSTM32F723xx \
-  -DHSE_VALUE=25000000 \
   -DCFG_TUSB_MCU=OPT_MCU_STM32F7 \
   -DBOARD_DEVICE_RHPORT_NUM=$(PORT)
 
@@ -33,9 +30,6 @@ ST_FAMILY = f7
 ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
 ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F723xE_FLASH.ld
-
 SRC_C += \
 	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
@@ -46,10 +40,8 @@ SRC_C += \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_pwr_ex.c
 
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
-
 INC += \
+  $(TOP)/$(BOARD_PATH) \
 	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
 	$(TOP)/$(ST_CMSIS)/Include \
 	$(TOP)/$(ST_HAL_DRIVER)/Inc \
@@ -61,6 +53,3 @@ CHIP_FAMILY = synopsys
 
 # For freeRTOS port source
 FREERTOS_PORT = ARM_CM7/r0p1
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/stm32f746disco/board.mk b/hw/bsp/stm32f746disco/board.mk
deleted file mode 100644
index e02dbc3f5..000000000
--- a/hw/bsp/stm32f746disco/board.mk
+++ /dev/null
@@ -1,66 +0,0 @@
-PORT ?= 0
-SPEED ?= high
-
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F746xx \
-  -DHSE_VALUE=25000000 \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F7 \
-  -DBOARD_DEVICE_RHPORT_NUM=$(PORT)
-
-ifeq ($(PORT), 1)
-  ifeq ($(SPEED), high)
-    CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
-    $(info "Using OTG_HS in HighSpeed mode")
-  else
-    CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
-    $(info "Using OTG_HS in FullSpeed mode")
-  endif
-else
-  $(info "Using OTG_FS")
-endif
-
-# mcu driver cause following warnings
-CFLAGS += -Wno-error=shadow -Wno-error=cast-align
-
-ST_FAMILY = f7
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F746ZGTx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc_ex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_pwr_ex.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/stm32f746disco/stm32f746disco.c b/hw/bsp/stm32f746disco/stm32f746disco.c
deleted file mode 100644
index c90182fcf..000000000
--- a/hw/bsp/stm32f746disco/stm32f746disco.c
+++ /dev/null
@@ -1,353 +0,0 @@
-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2020 Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de),
- * Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f7xx_hal.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-
-// Despite being call USB2_OTG
-// OTG_FS is marked as RHPort0 by TinyUSB to be consistent across stm32 port
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-// Despite being call USB2_OTG
-// OTG_HS is marked as RHPort1 by TinyUSB to be consistent across stm32 port
-void OTG_HS_IRQHandler(void)
-{
-  tud_int_handler(1);
-}
-
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOI
-#define LED_PIN               GPIO_PIN_1
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOI
-#define BUTTON_PIN            GPIO_PIN_11
-#define BUTTON_STATE_ACTIVE   1
-
-#define UARTx                 USART1
-#define UART_TX_GPIO_PORT     GPIOA
-#define UART_RX_GPIO_PORT     GPIOB
-#define UART_TX_GPIO_AF       GPIO_AF7_USART1
-#define UART_RX_GPIO_AF       GPIO_AF7_USART1
-#define UART_TX_PIN           GPIO_PIN_9
-#define UART_RX_PIN           GPIO_PIN_7
-
-UART_HandleTypeDef UartHandle;
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-
-  __HAL_RCC_GPIOB_CLK_ENABLE();  // Uart  rx
-  __HAL_RCC_GPIOI_CLK_ENABLE();  // Button
-  __HAL_RCC_USART1_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 216000000
-  *            HCLK(Hz)                       = 216000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 25000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 432
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 9
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 7
-  *         The USB clock configuration from PLLSAI:
-  *            PLLSAIP                        = 8
-  *            PLLSAIN                        = 384
-  *            PLLSAIQ                        = 7
-  * @param  None
-  * @retval None
-  */
-void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 432;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 9;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Activate the OverDrive to reach the 216 MHz Frequency */
-  HAL_PWREx_EnableOverDrive();
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
-}
-
-void board_init(void)
-{
-
-
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#endif
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  // Uart TX
-  GPIO_InitStruct.Pin       = UART_TX_PIN ;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = UART_TX_GPIO_AF;
-  HAL_GPIO_Init(UART_TX_GPIO_PORT, &GPIO_InitStruct);
-
-  // Uart RX
-  GPIO_InitStruct.Pin       = UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = UART_RX_GPIO_AF;
-  HAL_GPIO_Init(UART_RX_GPIO_PORT, &GPIO_InitStruct);
-
-  UartHandle.Instance        = UARTx;
-  UartHandle.Init.BaudRate   = CFG_BOARD_UART_BAUDRATE;
-  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
-  UartHandle.Init.StopBits   = UART_STOPBITS_1;
-  UartHandle.Init.Parity     = UART_PARITY_NONE;
-  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
-  UartHandle.Init.Mode       = UART_MODE_TX_RX;
-  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
-  HAL_UART_Init(&UartHandle);
-
-#if BOARD_DEVICE_RHPORT_NUM == 0
-  // Despite being call USB2_OTG
-  // OTG_FS is marked as RHPort0 by TinyUSB to be consistent across stm32 port
-  // PA9 VUSB, PA10 ID, PA11 DM, PA12 DP
-
-  /* Configure USB FS GPIOs */
-  /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin collides with USART TX*/
-//  GPIO_InitStruct.Pin = GPIO_PIN_9;
-//  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-//  GPIO_InitStruct.Pull = GPIO_NOPULL;
-//  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure OTG-FS ID pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Enable USB FS Clocks */
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-//  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
-#define DEVICE_BASE     (USB_OTG_DeviceTypeDef *) (USB_OTG_FS_PERIPH_BASE + USB_OTG_DEVICE_BASE)
-  USB_OTG_DeviceTypeDef * dev = DEVICE_BASE;
-    dev->DCTL |= USB_OTG_DCTL_SDIS;
-
-    /* Deactivate VBUS Sensing B */
-    USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
-
-    /* B-peripheral session valid override enable */
-    USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
-    USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
-#elif BOARD_DEVICE_RHPORT_NUM == 1
-  // Despite being call USB2_OTG
-  // OTG_HS is marked as RHPort1 by TinyUSB to be consistent across stm32 port
-  __GPIOA_CLK_ENABLE();
-  __GPIOB_CLK_ENABLE();
-  __GPIOC_CLK_ENABLE();
-  __GPIOH_CLK_ENABLE();
-
-  /* ULPI CK */
-  GPIO_InitStruct.Pin = GPIO_PIN_5;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* ULPI D0 */
-  GPIO_InitStruct.Pin = GPIO_PIN_3;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* ULPI D1 D2 D3 D4 D5 D6 D7 */
-  GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_5;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
-
-  /* ULPI STP DIR */
-  GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_2;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
-
-  /* NXT */
-  GPIO_InitStruct.Pin = GPIO_PIN_4;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
-
-  // Enable ULPI clock
-  __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
-
-  /* Enable USB HS Clocks */
-  __HAL_RCC_USB_OTG_HS_CLK_ENABLE();
-
-  // No VBUS sense
-  USB_OTG_HS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
-
-  // B-peripheral session valid override enable
-  USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
-  USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
-
-  // Force device mode
-  USB_OTG_HS->GUSBCFG &= ~USB_OTG_GUSBCFG_FHMOD;
-  USB_OTG_HS->GUSBCFG |= USB_OTG_GUSBCFG_FDMOD;
-
-#endif // rhport = 1
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  return HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
-  return len;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/stm32f746nucleo/board.mk b/hw/bsp/stm32f746nucleo/board.mk
deleted file mode 100644
index e7b240240..000000000
--- a/hw/bsp/stm32f746nucleo/board.mk
+++ /dev/null
@@ -1,49 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F746xx \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F7
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-align -Wno-error=shadow
-
-ST_FAMILY = f7
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F746ZGTx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc_ex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_pwr_ex.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/stm32f746nucleo/stm32f746nucleo.c b/hw/bsp/stm32f746nucleo/stm32f746nucleo.c
deleted file mode 100644
index 8e0cb78e3..000000000
--- a/hw/bsp/stm32f746nucleo/stm32f746nucleo.c
+++ /dev/null
@@ -1,255 +0,0 @@
-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 William D. Jones (thor0505@comcast.net),
- * Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f7xx_hal.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOB
-#define LED_PIN               GPIO_PIN_14
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOC
-#define BUTTON_PIN            GPIO_PIN_13
-#define BUTTON_STATE_ACTIVE   1
-
-#define UARTx                 USART3
-#define UART_GPIO_PORT        GPIOD
-#define UART_GPIO_AF          GPIO_AF7_USART3
-#define UART_TX_PIN           GPIO_PIN_8
-#define UART_RX_PIN           GPIO_PIN_9
-
-UART_HandleTypeDef UartHandle;
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-
-  __HAL_RCC_GPIOB_CLK_ENABLE();  // LED
-  __HAL_RCC_GPIOC_CLK_ENABLE();  // Button
-  __HAL_RCC_GPIOD_CLK_ENABLE();  // Uart tx, rx
-  __HAL_RCC_USART3_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 216000000
-  *            HCLK(Hz)                       = 216000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 8000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 432
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 9
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 7
-  *         The USB clock configuration from PLLSAI:
-  *            PLLSAIP                        = 8
-  *            PLLSAIN                        = 384
-  *            PLLSAIQ                        = 7
-  * @param  None
-  * @retval None
-  */
-void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 432;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 9;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Activate the OverDrive to reach the 216 MHz Frequency */
-  HAL_PWREx_EnableOverDrive();
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
-}
-
-void board_init(void)
-{
-
-
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#endif
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  // Uart
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
-  GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
-
-  UartHandle.Instance        = UARTx;
-  UartHandle.Init.BaudRate   = CFG_BOARD_UART_BAUDRATE;
-  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
-  UartHandle.Init.StopBits   = UART_STOPBITS_1;
-  UartHandle.Init.Parity     = UART_PARITY_NONE;
-  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
-  UartHandle.Init.Mode       = UART_MODE_TX_RX;
-  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
-  HAL_UART_Init(&UartHandle);
-
-  /* Configure USB FS GPIOs */
-  /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure ID pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Enable USB FS Clocks */
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  return HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
-  return len;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/stm32f767nucleo/board.mk b/hw/bsp/stm32f767nucleo/board.mk
deleted file mode 100644
index 9a6bada05..000000000
--- a/hw/bsp/stm32f767nucleo/board.mk
+++ /dev/null
@@ -1,49 +0,0 @@
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F767xx \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F7
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-align -Wno-error=shadow
-
-ST_FAMILY = f7
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F767ZITx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc_ex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_pwr_ex.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f767xx.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/stm32f767nucleo/stm32f767nucleo.c b/hw/bsp/stm32f767nucleo/stm32f767nucleo.c
deleted file mode 100644
index 8328c361a..000000000
--- a/hw/bsp/stm32f767nucleo/stm32f767nucleo.c
+++ /dev/null
@@ -1,257 +0,0 @@
-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 William D. Jones (thor0505@comcast.net),
- * Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f7xx_hal.h"
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOB
-#define LED_PIN               GPIO_PIN_14
-#define LED_STATE_ON          1
-
-#define BUTTON_PORT           GPIOC
-#define BUTTON_PIN            GPIO_PIN_13
-#define BUTTON_STATE_ACTIVE   1
-
-#define UARTx                 USART3
-#define UART_GPIO_PORT        GPIOD
-#define UART_GPIO_AF          GPIO_AF7_USART3
-#define UART_TX_PIN           GPIO_PIN_8
-#define UART_RX_PIN           GPIO_PIN_9
-
-UART_HandleTypeDef UartHandle;
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // USB D+, D-
-  __HAL_RCC_GPIOB_CLK_ENABLE();  // LED
-  __HAL_RCC_GPIOC_CLK_ENABLE();  // Button
-  __HAL_RCC_GPIOD_CLK_ENABLE();  // Uart tx, rx
-  __HAL_RCC_USART3_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 216000000
-  *            HCLK(Hz)                       = 216000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 8000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 432
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 9
-  *            PLL_R                          = 7
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 7
-  *         The USB clock configuration from PLLSAI:
-  *            PLLSAIP                        = 8
-  *            PLLSAIN                        = 384
-  *            PLLSAIQ                        = 7
-  * @param  None
-  * @retval None
-  */
-void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 432;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 9;
-  RCC_OscInitStruct.PLL.PLLR = 7;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Activate the OverDrive to reach the 216 MHz Frequency */
-  HAL_PWREx_EnableOverDrive();
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
-}
-
-void board_init(void)
-{
-
-
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#endif
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  // Uart
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
-  GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
-
-  UartHandle.Instance        = UARTx;
-  UartHandle.Init.BaudRate   = CFG_BOARD_UART_BAUDRATE;
-  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
-  UartHandle.Init.StopBits   = UART_STOPBITS_1;
-  UartHandle.Init.Parity     = UART_PARITY_NONE;
-  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
-  UartHandle.Init.Mode       = UART_MODE_TX_RX;
-  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
-  HAL_UART_Init(&UartHandle);
-
-  /* Configure USB FS GPIOs */
-  /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Configure ID pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* Enable USB FS Clocks */
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
-
-  // Enable VBUS sense (B device) via pin PA9
-  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  return HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
-  return len;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/stm32f769disco/board.mk b/hw/bsp/stm32f769disco/board.mk
deleted file mode 100644
index a963b905b..000000000
--- a/hw/bsp/stm32f769disco/board.mk
+++ /dev/null
@@ -1,63 +0,0 @@
-# Only OTG-HS has a connector on this board
-
-SPEED ?= high
-
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -nostdlib -nostartfiles \
-  -DSTM32F769xx \
-  -DHSE_VALUE=25000000 \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F7 \
-  -DBOARD_DEVICE_RHPORT_NUM=1 \
-
-ifeq ($(SPEED), high)
-  CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
-  $(info "Using OTG_HS in HighSpeed mode")
-else
-  CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
-  $(info "Using OTG_HS in FullSpeed mode")
-endif
-
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-align -Wno-error=shadow
-
-ST_FAMILY = f7
-ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
-ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/STM32F769ZITx_FLASH.ld
-
-SRC_C += \
-	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_rcc_ex.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_gpio.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_uart.c \
-	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_pwr_ex.c
-
-SRC_S += \
-	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f769xx.s
-
-INC += \
-	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
-	$(TOP)/$(ST_CMSIS)/Include \
-	$(TOP)/$(ST_HAL_DRIVER)/Inc \
-	$(TOP)/hw/bsp/$(BOARD)
-
-# For TinyUSB port source
-VENDOR = st
-CHIP_FAMILY = synopsys
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# flash target using on-board stlink
-flash: flash-stlink
diff --git a/hw/bsp/stm32f769disco/stm32f769disco.c b/hw/bsp/stm32f769disco/stm32f769disco.c
deleted file mode 100644
index 2664fe0e0..000000000
--- a/hw/bsp/stm32f769disco/stm32f769disco.c
+++ /dev/null
@@ -1,297 +0,0 @@
-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2020 Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de),
- * Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-
-#include "stm32f7xx_hal.h"
-
-void OTG_FS_IRQHandler(void)
-{
-  tud_int_handler(0);
-}
-
-//--------------------------------------------------------------------+
-// Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
-void OTG_HS_IRQHandler(void)
-{
-  tud_int_handler(1);
-}
-
-//--------------------------------------------------------------------+
-// MACRO TYPEDEF CONSTANT ENUM
-//--------------------------------------------------------------------+
-
-#define LED_PORT              GPIOJ
-#define LED_PIN               GPIO_PIN_12
-#define LED_STATE_ON          5
-
-#define BUTTON_PORT           GPIOA
-#define BUTTON_PIN            GPIO_PIN_0
-#define BUTTON_STATE_ACTIVE   1
-
-#define UARTx                 USART1
-#define UART_GPIO_PORT        GPIOA
-#define UART_GPIO_AF          GPIO_AF7_USART1
-#define UART_TX_PIN           GPIO_PIN_9
-#define UART_RX_PIN           GPIO_PIN_10
-
-UART_HandleTypeDef UartHandle;
-
-// enable all LED, Button, Uart, USB clock
-static void all_rcc_clk_enable(void)
-{
-  __HAL_RCC_GPIOA_CLK_ENABLE();  // Button, UART,  ULPI CLK|D0
-  __HAL_RCC_GPIOB_CLK_ENABLE();  // ULPI D1-7
-  __HAL_RCC_GPIOC_CLK_ENABLE();  // ULPI STP
-  __HAL_RCC_GPIOH_CLK_ENABLE();  // ULPI NXT
-  __HAL_RCC_GPIOI_CLK_ENABLE();  // ULPI NXT
-  __HAL_RCC_GPIOJ_CLK_ENABLE();  // LED
-  __HAL_RCC_USART1_CLK_ENABLE(); // Uart module
-}
-
-/**
-  * @brief  System Clock Configuration
-  *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 216000000
-  *            HCLK(Hz)                       = 216000000
-  *            AHB Prescaler                  = 1
-  *            APB1 Prescaler                 = 4
-  *            APB2 Prescaler                 = 2
-  *            HSE Frequency(Hz)              = 25000000
-  *            PLL_M                          = HSE_VALUE/1000000
-  *            PLL_N                          = 432
-  *            PLL_P                          = 2
-  *            PLL_Q                          = 9
-  *            PLL_R                          = 7
-  *            VDD(V)                         = 3.3
-  *            Main regulator output voltage  = Scale1 mode
-  *            Flash Latency(WS)              = 7
-  *         The USB clock configuration from PLLSAI:
-  *            PLLSAIP                        = 8
-  *            PLLSAIN                        = 384
-  *            PLLSAIQ                        = 7
-  * @param  None
-  * @retval None
-  */
-void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* Enable Power Control clock */
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* The voltage scaling allows optimizing the power consumption when the device is
-     clocked below the maximum system frequency, to update the voltage scaling value
-     regarding system frequency refer to product datasheet.  */
-  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  /* Enable HSE Oscillator and activate PLL with HSE as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
-  RCC_OscInitStruct.PLL.PLLN = 432;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
-  RCC_OscInitStruct.PLL.PLLQ = 9;
-  RCC_OscInitStruct.PLL.PLLR = 7;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
-  /* Activate the OverDrive to reach the 216 MHz Frequency */
-  HAL_PWREx_EnableOverDrive();
-
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
-
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
-}
-
-void board_init(void)
-{
-  SystemClock_Config();
-  all_rcc_clk_enable();
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#endif
-
-  GPIO_InitTypeDef  GPIO_InitStruct;
-
-  // LED
-  GPIO_InitStruct.Pin = LED_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
-
-  // Button
-  GPIO_InitStruct.Pin = BUTTON_PIN;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
-
-  // Uart
-  GPIO_InitStruct.Pin       = UART_TX_PIN | UART_RX_PIN;
-  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull      = GPIO_PULLUP;
-  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
-  GPIO_InitStruct.Alternate = UART_GPIO_AF;
-  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);
-
-  UartHandle.Instance        = UARTx;
-  UartHandle.Init.BaudRate   = CFG_BOARD_UART_BAUDRATE;
-  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
-  UartHandle.Init.StopBits   = UART_STOPBITS_1;
-  UartHandle.Init.Parity     = UART_PARITY_NONE;
-  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
-  UartHandle.Init.Mode       = UART_MODE_TX_RX;
-  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
-  HAL_UART_Init(&UartHandle);
-
-  /* Configure USB HS GPIOs */
-  /* ULPI CLK */
-  GPIO_InitStruct.Pin = GPIO_PIN_5;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* D0 */
-  GPIO_InitStruct.Pin = GPIO_PIN_3;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* D1 D2 D3 D4 D5 D6 D7 */
-  GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_5;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
-
-  /* STP */
-  GPIO_InitStruct.Pin = GPIO_PIN_0;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
-
-  /* NXT */
-  GPIO_InitStruct.Pin = GPIO_PIN_4;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
-
-  /* DIR */
-  GPIO_InitStruct.Pin = GPIO_PIN_11;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
-  HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
-
-  // Enable ULPI clock
-  __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
-
-  /* Enable USB HS Clocks */
-  __HAL_RCC_USB_OTG_HS_CLK_ENABLE();
-
-  // No VBUS sense
-  USB_OTG_HS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
-
-  // B-peripheral session valid override enable
-  USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
-  USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
-
-  // Force device mode
-  USB_OTG_HS->GUSBCFG &= ~USB_OTG_GUSBCFG_FHMOD;
-  USB_OTG_HS->GUSBCFG |= USB_OTG_GUSBCFG_FDMOD;
-
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state);
-}
-
-uint32_t board_button_read(void)
-{
-  return HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  HAL_UART_Transmit(&UartHandle, (uint8_t*) buf, len, 0xffff);
-  return len;
-}
-
-#if CFG_TUSB_OS  == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler (void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
-
-void HardFault_Handler (void)
-{
-  asm("bkpt");
-}
-
-// Required by __libc_init_array in startup code if we are compiling using
-// -nostdlib/-nostartfiles.
-void _init(void)
-{
-
-}
diff --git a/hw/bsp/teensy_40/board.mk b/hw/bsp/teensy_40/board.mk
deleted file mode 100644
index e49f13a1f..000000000
--- a/hw/bsp/teensy_40/board.mk
+++ /dev/null
@@ -1,52 +0,0 @@
-CFLAGS += \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -D__ARMVFP__=0 -D__ARMFPV5__=0\
-  -DCPU_MIMXRT1062DVL6A \
-  -DXIP_EXTERNAL_FLASH=1 \
-  -DXIP_BOOT_HEADER_ENABLE=1 \
-  -DCFG_TUSB_MCU=OPT_MCU_MIMXRT10XX
-
-# mcu driver cause following warnings
-CFLAGS += -Wno-error=unused-parameter
-
-MCU_DIR = hw/mcu/nxp/sdk/devices/MIMXRT1062
-
-# All source paths should be relative to the top level.
-LD_FILE = $(MCU_DIR)/gcc/MIMXRT1062xxxxx_flexspi_nor.ld
-
-SRC_C += \
-	$(MCU_DIR)/system_MIMXRT1062.c \
-	$(MCU_DIR)/xip/fsl_flexspi_nor_boot.c \
-	$(MCU_DIR)/project_template/clock_config.c \
-	$(MCU_DIR)/drivers/fsl_clock.c \
-	$(MCU_DIR)/drivers/fsl_gpio.c \
-	$(MCU_DIR)/drivers/fsl_common.c \
-	$(MCU_DIR)/drivers/fsl_lpuart.c
-
-INC += \
-	$(TOP)/hw/bsp/$(BOARD) \
-	$(TOP)/$(MCU_DIR)/../../CMSIS/Include \
-	$(TOP)/$(MCU_DIR) \
-	$(TOP)/$(MCU_DIR)/drivers \
-	$(TOP)/$(MCU_DIR)/project_template \
-
-SRC_S += $(MCU_DIR)/gcc/startup_MIMXRT1062.S
-
-# For TinyUSB port source
-VENDOR = nxp
-CHIP_FAMILY = transdimension
-
-# For freeRTOS port source
-FREERTOS_PORT = ARM_CM7/r0p1
-
-# For flash-jlink target
-JLINK_DEVICE = MIMXRT1062xxx6A
-
-# flash by using teensy_loader_cli https://github.com/PaulStoffregen/teensy_loader_cli
-# Make sure it is in your PATH 
-flash: $(BUILD)/$(BOARD)-firmware.hex
-	teensy_loader_cli --mcu=imxrt1062 -v -w $<
diff --git a/hw/bsp/teensy_40/teensy40.c b/hw/bsp/teensy_40/teensy40.c
deleted file mode 100644
index 85501df11..000000000
--- a/hw/bsp/teensy_40/teensy40.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/* 
- * The MIT License (MIT)
- *
- * Copyright (c) 2018, hathach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * This file is part of the TinyUSB stack.
- */
-
-#include "../board.h"
-#include "fsl_device_registers.h"
-#include "fsl_gpio.h"
-#include "fsl_iomuxc.h"
-#include "fsl_clock.h"
-#include "fsl_lpuart.h"
-
-#include "clock_config.h"
-
-#define LED_PINMUX            IOMUXC_GPIO_B0_03_GPIO2_IO03 // D13
-#define LED_PORT              GPIO2
-#define LED_PIN               3
-#define LED_STATE_ON          0
-
-// no button
-#define BUTTON_PINMUX         IOMUXC_GPIO_B0_01_GPIO2_IO01 // D12
-#define BUTTON_PORT           GPIO2
-#define BUTTON_PIN            1
-#define BUTTON_STATE_ACTIVE   0
-
-// UART
-#define UART_PORT             LPUART6
-#define UART_RX_PINMUX        IOMUXC_GPIO_AD_B0_03_LPUART6_RX  // D0
-#define UART_TX_PINMUX        IOMUXC_GPIO_AD_B0_02_LPUART6_TX  // D1
-
-// needed by fsl_flexspi_nor_boot
-const uint8_t dcd_data[] = { 0x00 };
-
-void board_init(void)
-{
-  // Init clock
-  BOARD_BootClockRUN();
-  SystemCoreClockUpdate();
-
-  // Enable IOCON clock
-  CLOCK_EnableClock(kCLOCK_Iomuxc);
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-  // 1ms tick timer
-  SysTick_Config(SystemCoreClock / 1000);
-#elif CFG_TUSB_OS == OPT_OS_FREERTOS
-  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-//  NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
-#endif
-
-  // LED
-  IOMUXC_SetPinMux( LED_PINMUX, 0U);
-  IOMUXC_SetPinConfig( LED_PINMUX, 0x10B0U);
-
-  gpio_pin_config_t led_config = { kGPIO_DigitalOutput, 0, kGPIO_NoIntmode };
-  GPIO_PinInit(LED_PORT, LED_PIN, &led_config);
-  board_led_write(true);
-
-  // Button
-  IOMUXC_SetPinMux( BUTTON_PINMUX, 0U);
-  IOMUXC_SetPinConfig(BUTTON_PINMUX, 0x01B0A0U);
-  gpio_pin_config_t button_config = { kGPIO_DigitalInput, 0, kGPIO_NoIntmode };
-  GPIO_PinInit(BUTTON_PORT, BUTTON_PIN, &button_config);
-
-  // UART
-  IOMUXC_SetPinMux( UART_TX_PINMUX, 0U);
-  IOMUXC_SetPinMux( UART_RX_PINMUX, 0U);
-  IOMUXC_SetPinConfig( UART_TX_PINMUX, 0x10B0u);
-  IOMUXC_SetPinConfig( UART_RX_PINMUX, 0x10B0u);
-
-  lpuart_config_t uart_config;
-  LPUART_GetDefaultConfig(&uart_config);
-  uart_config.baudRate_Bps = CFG_BOARD_UART_BAUDRATE;
-  uart_config.enableTx = true;
-  uart_config.enableRx = true;
-  LPUART_Init(UART_PORT, &uart_config, (CLOCK_GetPllFreq(kCLOCK_PllUsb1) / 6U) / (CLOCK_GetDiv(kCLOCK_UartDiv) + 1U));
-
-  //------------- USB0 -------------//
-  // Clock
-  CLOCK_EnableUsbhs0PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-  CLOCK_EnableUsbhs0Clock(kCLOCK_Usb480M, 480000000U);
-
-  USBPHY_Type* usb_phy = USBPHY1;
-
-  // Enable PHY support for Low speed device + LS via FS Hub
-  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
-
-  // Enable all power for normal operation
-  usb_phy->PWD = 0;
-
-  // TX Timing
-  uint32_t phytx = usb_phy->TX;
-  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
-  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
-  usb_phy->TX = phytx;
-
-  // USB1
-//  CLOCK_EnableUsbhs1PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
-//  CLOCK_EnableUsbhs1Clock(kCLOCK_Usb480M, 480000000U);
-}
-
-//--------------------------------------------------------------------+
-// USB Interrupt Handler
-//--------------------------------------------------------------------+
-void USB_OTG1_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_HOST
-    tuh_int_handler(0);
-  #endif
-
-  #if CFG_TUSB_RHPORT0_MODE & OPT_MODE_DEVICE
-    tud_int_handler(0);
-  #endif
-}
-
-void USB_OTG2_IRQHandler(void)
-{
-  #if CFG_TUSB_RHPORT1_MODE & OPT_MODE_HOST
-    tuh_int_handler(1);
-  #endif
-
-  #if CFG_TUSB_RHPORT1_MODE & OPT_MODE_DEVICE
-    tud_int_handler(1);
-  #endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  GPIO_PinWrite(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  // active low
-  return BUTTON_STATE_ACTIVE == GPIO_PinRead(BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  LPUART_ReadBlocking(UART_PORT, buf, len);
-  return len;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  LPUART_WriteBlocking(UART_PORT, (uint8_t*)buf, len);
-  return len;
-}
-
-#if CFG_TUSB_OS == OPT_OS_NONE
-volatile uint32_t system_ticks = 0;
-void SysTick_Handler(void)
-{
-  system_ticks++;
-}
-
-uint32_t board_millis(void)
-{
-  return system_ticks;
-}
-#endif
diff --git a/tools/build_all.py b/tools/build_all.py
index 172cb2070..787011e26 100644
--- a/tools/build_all.py
+++ b/tools/build_all.py
@@ -40,8 +40,13 @@ all_examples.sort()
 all_boards = []
 
 for entry in os.scandir("hw/bsp"):
-    if entry.is_dir():
-        all_boards.append(entry.name)
+    if entry.is_dir() and entry.name != "esp32s2":
+        if os.path.isdir(entry.path + "/boards"):
+            # family directory
+            for subentry in os.scandir(entry.path + "/boards"):
+                if subentry.is_dir(): all_boards.append(subentry.name)
+        else:
+            all_boards.append(entry.name)
 
 if len(sys.argv) > 1:
     input_boards = list(set(all_boards).intersection(sys.argv))
@@ -67,15 +72,14 @@ def build_size(example, board):
 
 def skip_example(example, board):
     ex_dir = 'examples/' + example
+
     board_mk = 'hw/bsp/{}/board.mk'.format(board)
+    if not os.path.exists(board_mk):
+        board_mk = list(glob.iglob('hw/bsp/*/boards/{}/../../family.mk'.format(board)))[0]
 
     with open(board_mk) as mk:
         mk_contents = mk.read()
 
-        # Skip all ESP32-S2 board for CI
-        if 'CROSS_COMPILE = xtensa-esp32s2-elf-' in mk_contents:
-            return 1
-
         # Skip all OPT_MCU_NONE these are WIP port
         if '-DCFG_TUSB_MCU=OPT_MCU_NONE' in mk_contents:
             return 1
diff --git a/tools/build_esp32s.py b/tools/build_esp32s.py
index 44364806b..c63bbf6d2 100644
--- a/tools/build_esp32s.py
+++ b/tools/build_esp32s.py
@@ -34,12 +34,9 @@ all_boards = []
 if len(sys.argv) > 2:
     all_boards.append(sys.argv[2])
 else:
-    for entry in os.scandir("hw/bsp"):
+    for entry in os.scandir("hw/bsp/esp32s2/boards"):
         if entry.is_dir():
-            with open(entry.path + '/board.mk') as mk:
-                # Only includes ESP32-S2 board
-                if 'CROSS_COMPILE = xtensa-esp32s2-elf-' in mk.read():
-                    all_boards.append(entry.name)
+            all_boards.append(entry.name)
                                 
 all_boards.sort()