make nanolib linking explicitly by each family/board

examples/build_system/make/cpu/cortex-m23.mk

@@ -0,0 +1,14 @@
+ifeq ($(TOOLCHAIN),gcc)
+  CFLAGS += \
+    -mthumb \
+    -mcpu=cortex-m23 \
+    -mfloat-abi=soft \
+
+else ifeq ($(TOOLCHAIN),iar)
+  # IAR Flags
+  CFLAGS += --cpu cortex-m23
+  ASFLAGS += --cpu cortex-m23
+endif
+
+# For freeRTOS port source
+FREERTOS_PORTABLE_SRC ?= $(FREERTOS_PORTABLE_PATH)/ARM_CM23

examples/build_system/make/toolchain/arm_gcc_rules.mk

@@ -31,10 +31,6 @@ ifdef LD_FILE_GCC
 LDFLAGS += -Wl,-T,$(TOP)/$(LD_FILE_GCC)
 endif
 
-ifneq ($(SKIP_NANOLIB), 1)
-LDFLAGS += --specs=nosys.specs --specs=nano.specs
-endif
-
 ASFLAGS += $(CFLAGS)
 
 LIBS_GCC ?= -lgcc -lm -lnosys

hw/bsp/ch32v307/family.mk

@@ -28,6 +28,8 @@ CFLAGS += \
 	-Xlinker --gc-sections \
 	-DBOARD_TUD_MAX_SPEED=OPT_MODE_HIGH_SPEED
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/wch/ch32v307/dcd_usbhs.c \
 	$(CH32V307_SDK_SRC)/Core/core_riscv.c \

hw/bsp/da14695_dk_usb/board.mk

@@ -1,3 +1,5 @@
+MCU_FAMILY_DIR = hw/mcu/dialog/da1469x
+
 CFLAGS += \
   -flto \
   -mthumb \
@@ -11,7 +13,7 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_DA1469X \
   -DCFG_TUD_ENDPOINT0_SIZE=8\
 
-MCU_FAMILY_DIR = hw/mcu/dialog/da1469x
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/$(BOARD)/da1469x.ld

hw/bsp/da1469x_dk_pro/board.mk

@@ -1,3 +1,5 @@
+MCU_FAMILY_DIR = hw/mcu/dialog/da1469x
+
 CFLAGS += \
   -flto \
   -mthumb \
@@ -11,7 +13,7 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_DA1469X \
   -DCFG_TUD_ENDPOINT0_SIZE=8\
 
-MCU_FAMILY_DIR = hw/mcu/dialog/da1469x
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/$(BOARD)/da1469x.ld

hw/bsp/f1c100s/board.mk

@@ -1,5 +1,5 @@
+MCU_DIR = hw/mcu/allwinner/f1c100s
 DEPS_SUBMODULES += hw/mcu/allwinner
-
 DEFINES += -D__ARM32_ARCH__=5 -D__ARM926EJS__
 
 CFLAGS += \
@@ -18,8 +18,8 @@ CFLAGS += \
   $(DEFINES)
 
 LD_FILE = hw/mcu/allwinner/f1c100s/f1c100s.ld
-LDFLAGS += -nostdlib -lgcc
+# TODO may skip nanolib
-MCU_DIR = hw/mcu/allwinner/f1c100s
+LDFLAGS += -nostdlib -lgcc -specs=nosys.specs -specs=nano.specs
 
 SRC_C += \
 	src/portable/sunxi/dcd_sunxi_musb.c \

hw/bsp/fomu/family.mk

@@ -1,3 +1,6 @@
+# Toolchain from https://github.com/xpack-dev-tools/riscv-none-embed-gcc-xpack
+CROSS_COMPILE = riscv-none-embed-
+
 CFLAGS += \
   -flto \
   -march=rv32i \
@@ -5,8 +8,7 @@ CFLAGS += \
   -nostdlib \
   -DCFG_TUSB_MCU=OPT_MCU_VALENTYUSB_EPTRI
 
-# Toolchain from https://github.com/xpack-dev-tools/riscv-none-embed-gcc-xpack
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
-CROSS_COMPILE = riscv-none-embed-
 
 # All source paths should be relative to the top level.
 LD_FILE = $(FAMILY_PATH)/fomu.ld

hw/bsp/imxrt/family.mk

@@ -5,8 +5,8 @@ DEPS_SUBMODULES += $(SDK_DIR) lib/CMSIS_5
 include $(TOP)/$(BOARD_PATH)/board.mk
 
 CPU_CORE ?= cortex-m7
-
 MCU_VARIANT_WITH_CORE = ${MCU_VARIANT}${MCU_CORE}
+MCU_DIR = $(SDK_DIR)/devices/$(MCU_VARIANT)
 
 CFLAGS += \
   -D__ARMVFP__=0 \
@@ -26,7 +26,7 @@ endif
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=unused-parameter -Wno-error=implicit-fallthrough -Wno-error=redundant-decls
 
-MCU_DIR = $(SDK_DIR)/devices/$(MCU_VARIANT)
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 # All source paths should be relative to the top level.
 LD_FILE ?= $(MCU_DIR)/gcc/$(MCU_VARIANT)xxxxx${MCU_CORE}_flexspi_nor.ld

hw/bsp/kinetis_k32l2/family.mk

@@ -9,6 +9,8 @@ CPU_CORE ?= cortex-m0plus
 CFLAGS += \
 	-DCFG_TUSB_MCU=OPT_MCU_KINETIS_K32L
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/nxp/khci/dcd_khci.c \
 	src/portable/nxp/khci/hcd_khci.c \

hw/bsp/kinetis_kl/family.mk

@@ -9,6 +9,7 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_KINETIS_KL \
 
 LDFLAGS += \
+  -specs=nosys.specs -specs=nano.specs \
   -Wl,--defsym,__stack_size__=0x400 \
   -Wl,--defsym,__heap_size__=0
 

hw/bsp/lpc11/family.mk

@@ -11,6 +11,8 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_LPC11UXX \
   -DCFG_TUSB_MEM_ALIGN='__attribute__((aligned(64)))'
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/nxp/lpc_ip3511/dcd_lpc_ip3511.c \
 	$(MCU_DIR)/../gcc/cr_startup_lpc$(MCU_DRV).c \

hw/bsp/lpc13/family.mk

@@ -14,6 +14,8 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_LPC13XX \
   -DCFG_TUSB_MEM_ALIGN='__attribute__((aligned(64)))'
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # startup.c and lpc_types.h cause following errors
 CFLAGS += -Wno-error=strict-prototypes -Wno-error=redundant-decls
 

hw/bsp/lpc15/family.mk

@@ -12,6 +12,8 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_LPC15XX \
   -DCFG_TUSB_MEM_ALIGN='__attribute__((aligned(64)))'
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=strict-prototypes -Wno-error=unused-parameter -Wno-error=unused-variable -Wno-error=cast-qual
 

hw/bsp/lpc17/family.mk

@@ -18,7 +18,7 @@ CFLAGS += -Wno-error=strict-prototypes -Wno-error=cast-qual
 # caused by freeRTOS port !!
 CFLAGS += -Wno-error=maybe-uninitialized
 
-MCU_DIR = hw/mcu/nxp/lpcopen/lpc175x_6x/lpc_chip_175x_6x
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 SRC_C += \
 	src/portable/nxp/lpc17_40/dcd_lpc17_40.c \

hw/bsp/lpc18/family.mk

@@ -1,4 +1,5 @@
 DEPS_SUBMODULES += hw/mcu/nxp/lpcopen
+MCU_DIR = hw/mcu/nxp/lpcopen/lpc18xx/lpc_chip_18xx
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 CPU_CORE ?= cortex-m3
@@ -13,7 +14,7 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=unused-parameter -Wno-error=strict-prototypes -Wno-error=cast-qual
 
-MCU_DIR = hw/mcu/nxp/lpcopen/lpc18xx/lpc_chip_18xx
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 SRC_C += \
 	src/portable/chipidea/ci_hs/dcd_ci_hs.c \

hw/bsp/lpc40/family.mk

@@ -15,6 +15,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=strict-prototypes -Wno-error=unused-parameter -Wno-error=cast-qual
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 SRC_C += \
 	src/portable/nxp/lpc17_40/dcd_lpc17_40.c \

hw/bsp/lpc43/family.mk

@@ -18,6 +18,8 @@ CFLAGS += \
   -Wno-error=cast-qual \
   -Wno-error=incompatible-pointer-types \
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/chipidea/ci_hs/dcd_ci_hs.c \
 	src/portable/chipidea/ci_hs/hcd_ci_hs.c \

hw/bsp/lpc51/family.mk

@@ -13,6 +13,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=unused-parameter
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE = $(MCU_DIR)/gcc/$(MCU)_flash.ld
 

hw/bsp/lpc54/family.mk

@@ -3,6 +3,7 @@ DEPS_SUBMODULES += $(SDK_DIR) lib/CMSIS_5
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 CPU_CORE ?= cortex-m4
+MCU_DIR = $(SDK_DIR)/devices/$(MCU_VARIANT)
 
 CFLAGS += \
   -flto \
@@ -22,7 +23,7 @@ endif
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=unused-parameter
 
-MCU_DIR = $(SDK_DIR)/devices/$(MCU_VARIANT)
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 SRC_C += \
 	src/portable/nxp/lpc_ip3511/dcd_lpc_ip3511.c \

hw/bsp/lpc55/family.mk

@@ -4,6 +4,7 @@ DEPS_SUBMODULES += lib/CMSIS_5 lib/sct_neopixel $(SDK_DIR)
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 CPU_CORE ?= cortex-m33
+MCU_DIR = $(SDK_DIR)/devices/$(MCU_VARIANT)
 
 # Default to Highspeed PORT1
 PORT ?= 1
@@ -27,7 +28,7 @@ endif
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=unused-parameter -Wno-error=float-equal
 
-MCU_DIR = $(SDK_DIR)/devices/$(MCU_VARIANT)
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 # All source paths should be relative to the top level.
 LD_FILE ?= $(MCU_DIR)/gcc/$(MCU_CORE)_flash.ld

hw/bsp/mcx/family.mk

@@ -17,6 +17,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=unused-parameter -Wno-error=old-style-declaration
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE ?= $(SDK_DIR)/devices/$(MCU_VARIANT)/gcc/$(MCU_CORE)_flash.ld
 

hw/bsp/mm32/family.mk

@@ -13,6 +13,8 @@ CFLAGS += \
 # suppress warning caused by vendor mcu driver
 CFLAGS += -Wno-error=unused-parameter -Wno-error=maybe-uninitialized -Wno-error=cast-qual
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/mindmotion/mm32/dcd_mm32f327x_otg.c \
 	$(SDK_DIR)/mm32f327x/MM32F327x/Source/system_mm32f327x.c \

hw/bsp/msp432e4/family.mk

@@ -12,6 +12,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=cast-qual -Wno-error=format=
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE = hw/mcu/ti/msp432e4/Source/msp432e401y.ld
 LDINC += $(TOP)/hw/mcu/ti/msp432e4/Include

hw/bsp/ngx4330/board.mk

@@ -1,47 +0,0 @@
-DEPS_SUBMODULES += hw/mcu/nxp/lpcopen
-
-CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
-  -nostdlib \
-  -DCORE_M4 \
-  -D__USE_LPCOPEN \
-  -DCFG_TUSB_MCU=OPT_MCU_LPC43XX
-
-# mcu driver cause following warnings
-CFLAGS += -Wno-error=strict-prototypes -Wno-error=unused-parameter -Wno-error=cast-qual
-
-MCU_DIR = hw/mcu/nxp/lpcopen/lpc43xx/lpc_chip_43xx
-
-# All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/ngx4330.ld
-
-SRC_C += \
-	src/portable/chipidea/ci_hs/dcd_ci_hs.c \
-	src/portable/chipidea/ci_hs/hcd_ci_hs.c \
-	src/portable/ehci/ehci.c \
-	$(MCU_DIR)/../gcc/cr_startup_lpc43xx.c \
-	$(MCU_DIR)/src/chip_18xx_43xx.c \
-	$(MCU_DIR)/src/clock_18xx_43xx.c \
-	$(MCU_DIR)/src/gpio_18xx_43xx.c \
-	$(MCU_DIR)/src/sysinit_18xx_43xx.c \
-	$(MCU_DIR)/src/uart_18xx_43xx.c \
-	$(MCU_DIR)/src/fpu_init.c
-
-INC += \
-	$(TOP)/$(MCU_DIR)/inc \
-	$(TOP)/$(MCU_DIR)/inc/config_43xx
-
-# For freeRTOS port source
-FREERTOS_PORTABLE_SRC = $(FREERTOS_PORTABLE_PATH)/ARM_CM4F
-
-# For flash-jlink target
-JLINK_DEVICE = LPC4330
-JLINK_IF = swd
-
-# flash using jlink
-flash: flash-jlink

hw/bsp/ngx4330/ngx4330.c

@@ -1,271 +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 "chip.h"
-#include "../board_api.h"
-
-#define LED_PORT              1
-#define LED_PIN               12
-#define LED_STATE_ON          0
-
-#define BUTTON_PORT           0
-#define BUTTON_PIN            7
-#define BUTTON_STATE_ACTIVE   0
-
-#define BOARD_UART_PORT           LPC_USART0
-#define BOARD_UART_PIN_PORT       0x0f
-#define BOARD_UART_PIN_TX         10 // PF.10 : UART0_TXD
-#define BOARD_UART_PIN_RX         11 // PF.11 : UART0_RXD
-
-#ifdef BOARD_TUD_RHPORT
-  #define PORT_SUPPORT_DEVICE(_n)  (BOARD_TUD_RHPORT == _n)
-#else
-  #define PORT_SUPPORT_DEVICE(_n)  0
-#endif
-
-#ifdef BOARD_TUH_RHPORT
-  #define PORT_SUPPORT_HOST(_n)    (BOARD_TUH_RHPORT == _n)
-#else
-  #define PORT_SUPPORT_HOST(_n)    0
-#endif
-
-/*------------------------------------------------------------------*/
-/* BOARD API
- *------------------------------------------------------------------*/
-
-/* System configuration variables used by chip driver */
-const uint32_t OscRateIn = 12000000;
-const uint32_t ExtRateIn = 0;
-
-static const PINMUX_GRP_T pinmuxing[] =
-{
-  // LED P2.12 as GPIO 1.12
-  {2, 11, (SCU_MODE_INBUFF_EN | SCU_MODE_PULLDOWN | SCU_MODE_FUNC0)},
-
-  // Button P2.7 as GPIO 0.7
-  {2, 7,  (SCU_MODE_PULLUP | SCU_MODE_INBUFF_EN | SCU_MODE_ZIF_DIS | SCU_MODE_FUNC0)},
-
-  // USB
-  {2, 6, (SCU_MODE_PULLUP | SCU_MODE_INBUFF_EN | SCU_MODE_FUNC4)}, // USB1_PWR_EN
-  {2, 5, (SCU_MODE_INACT | SCU_MODE_INBUFF_EN | SCU_MODE_ZIF_DIS | SCU_MODE_FUNC2)}, // USB1_VBUS
-  {1, 7, (SCU_MODE_PULLUP | SCU_MODE_INBUFF_EN | SCU_MODE_FUNC4)}, // USB0_PWRN_EN
-
-  // SPIFI
-	{3, 3,  (SCU_PINIO_FAST | SCU_MODE_FUNC3)},	/* SPIFI CLK */
-	{3, 4,  (SCU_PINIO_FAST | SCU_MODE_FUNC3)},	/* SPIFI D3 */
-	{3, 5,  (SCU_PINIO_FAST | SCU_MODE_FUNC3)},	/* SPIFI D2 */
-	{3, 6,  (SCU_PINIO_FAST | SCU_MODE_FUNC3)},	/* SPIFI D1 */
-	{3, 7,  (SCU_PINIO_FAST | SCU_MODE_FUNC3)},	/* SPIFI D0 */
-	{3, 8,  (SCU_PINIO_FAST | SCU_MODE_FUNC3)}	/* SPIFI CS/SSEL */
-};
-
-// Invoked by startup code
-void SystemInit(void)
-{
-#ifdef __USE_LPCOPEN
-	extern void (* const g_pfnVectors[])(void);
-  unsigned int *pSCB_VTOR = (unsigned int *) 0xE000ED08;
-	*pSCB_VTOR = (unsigned int) g_pfnVectors;
-
-#if __FPU_USED == 1
-	fpuInit();
-#endif
-#endif // __USE_LPCOPEN
-
-	// Set up pinmux
-	Chip_SCU_SetPinMuxing(pinmuxing, sizeof(pinmuxing) / sizeof(PINMUX_GRP_T));
-
-	//------------- Set up clock -------------//
-	Chip_Clock_SetBaseClock(CLK_BASE_SPIFI, CLKIN_IRC, true, false);	// change SPIFI to IRC during clock programming
-	LPC_SPIFI->CTRL |= SPIFI_CTRL_FBCLK(1);								            // and set FBCLK in SPIFI controller
-
-	Chip_SetupCoreClock(CLKIN_CRYSTAL, MAX_CLOCK_FREQ, true);
-
-	/* Reset and enable 32Khz oscillator */
-	LPC_CREG->CREG0 &= ~((1 << 3) | (1 << 2));
-	LPC_CREG->CREG0 |= (1 << 1) | (1 << 0);
-
-	/* Setup a divider E for main PLL clock switch SPIFI clock to that divider.
-	   Divide rate is based on CPU speed and speed of SPI FLASH part. */
-#if (MAX_CLOCK_FREQ > 180000000)
-	Chip_Clock_SetDivider(CLK_IDIV_E, CLKIN_MAINPLL, 5);
-#else
-	Chip_Clock_SetDivider(CLK_IDIV_E, CLKIN_MAINPLL, 4);
-#endif
-	Chip_Clock_SetBaseClock(CLK_BASE_SPIFI, CLKIN_IDIVE, true, false);
-
-	/* Setup system base clocks and initial states. This won't enable and
-	   disable individual clocks, but sets up the base clock sources for
-	   each individual peripheral clock. */
-	Chip_Clock_SetBaseClock(CLK_BASE_USB1, CLKIN_IDIVD, true, true);
-}
-
-void board_init(void)
-{
-  SystemCoreClockUpdate();
-
-#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
-
-  Chip_GPIO_Init(LPC_GPIO_PORT);
-
-  // LED
-  Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, LED_PORT, LED_PIN);
-
-  // Button
-  Chip_GPIO_SetPinDIRInput(LPC_GPIO_PORT, BUTTON_PORT, BUTTON_PIN);
-
-#if 0
-  //------------- UART -------------//
-  scu_pinmux(BOARD_UART_PIN_PORT, BOARD_UART_PIN_TX, MD_PDN, FUNC1);
-  scu_pinmux(BOARD_UART_PIN_PORT, BOARD_UART_PIN_RX, MD_PLN | MD_EZI | MD_ZI, FUNC1);
-
-  UART_CFG_Type UARTConfigStruct;
-  UART_ConfigStructInit(&UARTConfigStruct);
-  UARTConfigStruct.Baud_rate   = CFG_BOARD_UART_BAUDRATE;
-  UARTConfigStruct.Clock_Speed = 0;
-
-  UART_Init(BOARD_UART_PORT, &UARTConfigStruct);
-  UART_TxCmd(BOARD_UART_PORT, ENABLE); // Enable UART Transmit
-#endif
-
-  //------------- USB -------------//
-  enum {
-    USBMODE_DEVICE = 2,
-    USBMODE_HOST   = 3
-  };
-
-  enum {
-    USBMODE_VBUS_LOW  = 0,
-    USBMODE_VBUS_HIGH = 1
-  };
-
-  /* USB0
-   * For USB Device operation; insert jumpers in position 1-2 in JP17/JP18/JP19. GPIO28 controls USB
-   * connect functionality and LED32 lights when the USB Device is connected. SJ4 has pads 1-2 shorted
-   * by default. LED33 is controlled by GPIO27 and signals USB-up state. GPIO54 is used for VBUS
-   * sensing.
-   * For USB Host operation; insert jumpers in position 2-3 in JP17/JP18/JP19. USB Host power is
-   * controlled via distribution switch U20 (found in schematic page 11). Signal GPIO26 is active low and
-   * enables +5V on VBUS2. LED35 light whenever +5V is present on VBUS2. GPIO55 is connected to
-   * status feedback from the distribution switch. GPIO54 is used for VBUS sensing. 15Kohm pull-down
-   * resistors are always active
-   */
-  Chip_USB0_Init();
-
-  /* USB1
-   * When USB channel #1 is used as USB Host, 15Kohm pull-down resistors are needed on the USB data
-   * signals. These are activated inside the USB OTG chip (U31), and this has to be done via the I2C
-   * interface of GPIO52/GPIO53.
-   * J20 is the connector to use when USB Host is used. In order to provide +5V to the external USB
-   * device connected to this connector (J20), channel A of U20 must be enabled. It is enabled by default
-   * since SJ5 is normally connected between pin 1-2. LED34 lights green when +5V is available on J20.
-   * JP15 shall not be inserted. JP16 has no effect
-   *
-   * When USB channel #1 is used as USB Device, a 1.5Kohm pull-up resistor is needed on the USB DP
-   * data signal. There are two methods to create this. JP15 is inserted and the pull-up resistor is always
-   * enabled. Alternatively, the pull-up resistor is activated inside the USB OTG chip (U31), and this has to
-   * be done via the I2C interface of GPIO52/GPIO53. In the latter case, JP15 shall not be inserted.
-   * J19 is the connector to use when USB Device is used. Normally it should be a USB-B connector for
-   * creating a USB Device interface, but the mini-AB connector can also be used in this case. The status
-   * of VBUS can be read via U31.
-   * JP16 shall not be inserted.
-   */
-  Chip_USB1_Init();
-//	Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 5, 6);							/* GPIO5[6] = USB1_PWR_EN */
-//	Chip_GPIO_SetPinState(LPC_GPIO_PORT, 5, 6, true);							/* GPIO5[6] output high */
-}
-
-//--------------------------------------------------------------------+
-// USB Interrupt Handler
-//--------------------------------------------------------------------+
-void USB0_IRQHandler(void)
-{
-  #if PORT_SUPPORT_DEVICE(0)
-    tud_int_handler(0);
-  #endif
-
-  #if PORT_SUPPORT_HOST(0)
-    tuh_int_handler(0, true);
-  #endif
-}
-
-void USB1_IRQHandler(void)
-{
-  #if PORT_SUPPORT_DEVICE(1)
-    tud_int_handler(1);
-  #endif
-
-  #if PORT_SUPPORT_HOST(1)
-    tuh_int_handler(1, true);
-  #endif
-}
-
-//--------------------------------------------------------------------+
-// Board porting API
-//--------------------------------------------------------------------+
-
-void board_led_write(bool state)
-{
-  Chip_GPIO_SetPinState(LPC_GPIO_PORT, LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
-}
-
-uint32_t board_button_read(void)
-{
-  return BUTTON_STATE_ACTIVE == Chip_GPIO_GetPinState(LPC_GPIO_PORT, BUTTON_PORT, BUTTON_PIN);
-}
-
-int board_uart_read(uint8_t* buf, int len)
-{
-  //return UART_ReceiveByte(BOARD_UART_PORT);
-  (void) buf; (void) len;
-  return 0;
-}
-
-int board_uart_write(void const * buf, int len)
-{
-  //UART_Send(BOARD_UART_PORT, &c, 1, BLOCKING);
-  (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

hw/bsp/ngx4330/ngx4330.ld

@@ -1,343 +0,0 @@
-/*
- * GENERATED FILE - DO NOT EDIT
- * Copyright (c) 2008-2013 Code Red Technologies Ltd,
- * Copyright 2015, 2018-2019 NXP
- * (c) NXP Semiconductors 2013-2019
- * Generated linker script file for LPC4330
- * Created from linkscript.ldt by FMCreateLinkLibraries
- * Using Freemarker v2.3.23
- * MCUXpresso IDE v11.0.0 [Build 2516] [2019-06-05] on Sep 9, 2019 12:09:49 PM
- */
-
-MEMORY
-{
-  /* Define each memory region */
-  RamLoc128 (rwx) : ORIGIN = 0x10000000, LENGTH = 0x20000 /* 128K bytes (alias RAM) */
-  RamLoc72 (rwx) : ORIGIN = 0x10080000, LENGTH = 0x12000 /* 72K bytes (alias RAM2) */
-  RamAHB32 (rwx) : ORIGIN = 0x20000000, LENGTH = 0x8000 /* 32K bytes (alias RAM3) */
-  RamAHB16 (rwx) : ORIGIN = 0x20008000, LENGTH = 0x4000 /* 16K bytes (alias RAM4) */
-  RamAHB_ETB16 (rwx) : ORIGIN = 0x2000c000, LENGTH = 0x4000 /* 16K bytes (alias RAM5) */
-  SPIFI (rx) : ORIGIN = 0x14000000, LENGTH = 0x400000 /* 4M bytes (alias Flash) */
-}
-
-  /* Define a symbol for the top of each memory region */
-  __base_RamLoc128 = 0x10000000  ; /* RamLoc128 */
-  __base_RAM = 0x10000000 ; /* RAM */
-  __top_RamLoc128 = 0x10000000 + 0x20000 ; /* 128K bytes */
-  __top_RAM = 0x10000000 + 0x20000 ; /* 128K bytes */
-  __base_RamLoc72 = 0x10080000  ; /* RamLoc72 */
-  __base_RAM2 = 0x10080000 ; /* RAM2 */
-  __top_RamLoc72 = 0x10080000 + 0x12000 ; /* 72K bytes */
-  __top_RAM2 = 0x10080000 + 0x12000 ; /* 72K bytes */
-  __base_RamAHB32 = 0x20000000  ; /* RamAHB32 */
-  __base_RAM3 = 0x20000000 ; /* RAM3 */
-  __top_RamAHB32 = 0x20000000 + 0x8000 ; /* 32K bytes */
-  __top_RAM3 = 0x20000000 + 0x8000 ; /* 32K bytes */
-  __base_RamAHB16 = 0x20008000  ; /* RamAHB16 */
-  __base_RAM4 = 0x20008000 ; /* RAM4 */
-  __top_RamAHB16 = 0x20008000 + 0x4000 ; /* 16K bytes */
-  __top_RAM4 = 0x20008000 + 0x4000 ; /* 16K bytes */
-  __base_RamAHB_ETB16 = 0x2000c000  ; /* RamAHB_ETB16 */
-  __base_RAM5 = 0x2000c000 ; /* RAM5 */
-  __top_RamAHB_ETB16 = 0x2000c000 + 0x4000 ; /* 16K bytes */
-  __top_RAM5 = 0x2000c000 + 0x4000 ; /* 16K bytes */
-  __base_SPIFI = 0x14000000  ; /* SPIFI */
-  __base_Flash = 0x14000000 ; /* Flash */
-  __top_SPIFI = 0x14000000 + 0x400000 ; /* 4M bytes */
-  __top_Flash = 0x14000000 + 0x400000 ; /* 4M bytes */
-
-ENTRY(ResetISR)
-
-SECTIONS
-{
-     /* MAIN TEXT SECTION */
-    .text : ALIGN(4)
-    {
-        FILL(0xff)
-        __vectors_start__ = ABSOLUTE(.) ;
-        KEEP(*(.isr_vector))
-        /* Global Section Table */
-        . = ALIGN(4) ;
-        __section_table_start = .;
-        __data_section_table = .;
-        LONG(LOADADDR(.data));
-        LONG(    ADDR(.data));
-        LONG(  SIZEOF(.data));
-        LONG(LOADADDR(.data_RAM2));
-        LONG(    ADDR(.data_RAM2));
-        LONG(  SIZEOF(.data_RAM2));
-        LONG(LOADADDR(.data_RAM3));
-        LONG(    ADDR(.data_RAM3));
-        LONG(  SIZEOF(.data_RAM3));
-        LONG(LOADADDR(.data_RAM4));
-        LONG(    ADDR(.data_RAM4));
-        LONG(  SIZEOF(.data_RAM4));
-        LONG(LOADADDR(.data_RAM5));
-        LONG(    ADDR(.data_RAM5));
-        LONG(  SIZEOF(.data_RAM5));
-        __data_section_table_end = .;
-        __bss_section_table = .;
-        LONG(    ADDR(.bss));
-        LONG(  SIZEOF(.bss));
-        LONG(    ADDR(.bss_RAM2));
-        LONG(  SIZEOF(.bss_RAM2));
-        LONG(    ADDR(.bss_RAM3));
-        LONG(  SIZEOF(.bss_RAM3));
-        LONG(    ADDR(.bss_RAM4));
-        LONG(  SIZEOF(.bss_RAM4));
-        LONG(    ADDR(.bss_RAM5));
-        LONG(  SIZEOF(.bss_RAM5));
-        __bss_section_table_end = .;
-        __section_table_end = . ;
-        /* End of Global Section Table */
-
-        *(.after_vectors*)
-
-    } > SPIFI
-
-    .text : ALIGN(4)
-    {
-       *(.text*)
-       *(.rodata .rodata.* .constdata .constdata.*)
-       . = ALIGN(4);
-    } > SPIFI
-    /*
-     * for exception handling/unwind - some Newlib functions (in common
-     * with C++ and STDC++) use this.
-     */
-    .ARM.extab : ALIGN(4)
-    {
-        *(.ARM.extab* .gnu.linkonce.armextab.*)
-    } > SPIFI
-
-    __exidx_start = .;
-
-    .ARM.exidx : ALIGN(4)
-    {
-        *(.ARM.exidx* .gnu.linkonce.armexidx.*)
-    } > SPIFI
-    __exidx_end = .;
-
-    _etext = .;
-
-    /* DATA section for RamLoc72 */
-
-    .data_RAM2 : ALIGN(4)
-    {
-        FILL(0xff)
-        PROVIDE(__start_data_RAM2 = .) ;
-        *(.ramfunc.$RAM2)
-        *(.ramfunc.$RamLoc72)
-        *(.data.$RAM2)
-        *(.data.$RamLoc72)
-        *(.data.$RAM2.*)
-        *(.data.$RamLoc72.*)
-        . = ALIGN(4) ;
-        PROVIDE(__end_data_RAM2 = .) ;
-     } > RamLoc72 AT>SPIFI
-    /* DATA section for RamAHB32 */
-
-    .data_RAM3 : ALIGN(4)
-    {
-        FILL(0xff)
-        PROVIDE(__start_data_RAM3 = .) ;
-        *(.ramfunc.$RAM3)
-        *(.ramfunc.$RamAHB32)
-        *(.data.$RAM3)
-        *(.data.$RamAHB32)
-        *(.data.$RAM3.*)
-        *(.data.$RamAHB32.*)
-        . = ALIGN(4) ;
-        PROVIDE(__end_data_RAM3 = .) ;
-     } > RamAHB32 AT>SPIFI
-    /* DATA section for RamAHB16 */
-
-    .data_RAM4 : ALIGN(4)
-    {
-        FILL(0xff)
-        PROVIDE(__start_data_RAM4 = .) ;
-        *(.ramfunc.$RAM4)
-        *(.ramfunc.$RamAHB16)
-        *(.data.$RAM4)
-        *(.data.$RamAHB16)
-        *(.data.$RAM4.*)
-        *(.data.$RamAHB16.*)
-        . = ALIGN(4) ;
-        PROVIDE(__end_data_RAM4 = .) ;
-     } > RamAHB16 AT>SPIFI
-    /* DATA section for RamAHB_ETB16 */
-
-    .data_RAM5 : ALIGN(4)
-    {
-        FILL(0xff)
-        PROVIDE(__start_data_RAM5 = .) ;
-        *(.ramfunc.$RAM5)
-        *(.ramfunc.$RamAHB_ETB16)
-        *(.data.$RAM5)
-        *(.data.$RamAHB_ETB16)
-        *(.data.$RAM5.*)
-        *(.data.$RamAHB_ETB16.*)
-        . = ALIGN(4) ;
-        PROVIDE(__end_data_RAM5 = .) ;
-     } > RamAHB_ETB16 AT>SPIFI
-    /* MAIN DATA SECTION */
-    .uninit_RESERVED (NOLOAD) :
-    {
-        . = ALIGN(4) ;
-        KEEP(*(.bss.$RESERVED*))
-       . = ALIGN(4) ;
-        _end_uninit_RESERVED = .;
-    } > RamLoc128
-
-    /* Main DATA section (RamLoc128) */
-    .data : ALIGN(4)
-    {
-       FILL(0xff)
-       _data = . ;
-       *(vtable)
-       *(.ramfunc*)
-       *(.data*)
-       . = ALIGN(4) ;
-       _edata = . ;
-    } > RamLoc128 AT>SPIFI
-
-    /* BSS section for RamLoc72 */
-    .bss_RAM2 :
-    {
-       . = ALIGN(4) ;
-       PROVIDE(__start_bss_RAM2 = .) ;
-       *(.bss.$RAM2)
-       *(.bss.$RamLoc72)
-       *(.bss.$RAM2.*)
-       *(.bss.$RamLoc72.*)
-       . = ALIGN (. != 0 ? 4 : 1) ; /* avoid empty segment */
-       PROVIDE(__end_bss_RAM2 = .) ;
-    } > RamLoc72
-
-    /* BSS section for RamAHB32 */
-    .bss_RAM3 :
-    {
-       . = ALIGN(4) ;
-       PROVIDE(__start_bss_RAM3 = .) ;
-       *(.bss.$RAM3)
-       *(.bss.$RamAHB32)
-       *(.bss.$RAM3.*)
-       *(.bss.$RamAHB32.*)
-       . = ALIGN (. != 0 ? 4 : 1) ; /* avoid empty segment */
-       PROVIDE(__end_bss_RAM3 = .) ;
-    } > RamAHB32
-
-    /* BSS section for RamAHB16 */
-    .bss_RAM4 :
-    {
-       . = ALIGN(4) ;
-       PROVIDE(__start_bss_RAM4 = .) ;
-       *(.bss.$RAM4)
-       *(.bss.$RamAHB16)
-       *(.bss.$RAM4.*)
-       *(.bss.$RamAHB16.*)
-       . = ALIGN (. != 0 ? 4 : 1) ; /* avoid empty segment */
-       PROVIDE(__end_bss_RAM4 = .) ;
-    } > RamAHB16
-
-    /* BSS section for RamAHB_ETB16 */
-    .bss_RAM5 :
-    {
-       . = ALIGN(4) ;
-       PROVIDE(__start_bss_RAM5 = .) ;
-       *(.bss.$RAM5)
-       *(.bss.$RamAHB_ETB16)
-       *(.bss.$RAM5.*)
-       *(.bss.$RamAHB_ETB16.*)
-       . = ALIGN (. != 0 ? 4 : 1) ; /* avoid empty segment */
-       PROVIDE(__end_bss_RAM5 = .) ;
-    } > RamAHB_ETB16
-
-    /* MAIN BSS SECTION */
-    .bss :
-    {
-        . = ALIGN(4) ;
-        _bss = .;
-        *(.bss*)
-        *(COMMON)
-        . = ALIGN(4) ;
-        _ebss = .;
-        PROVIDE(end = .);
-    } > RamLoc128
-
-    /* NOINIT section for RamLoc72 */
-    .noinit_RAM2 (NOLOAD) :
-    {
-       . = ALIGN(4) ;
-       *(.noinit.$RAM2)
-       *(.noinit.$RamLoc72)
-       *(.noinit.$RAM2.*)
-       *(.noinit.$RamLoc72.*)
-       . = ALIGN(4) ;
-    } > RamLoc72
-
-    /* NOINIT section for RamAHB32 */
-    .noinit_RAM3 (NOLOAD) :
-    {
-       . = ALIGN(4) ;
-       *(.noinit.$RAM3)
-       *(.noinit.$RamAHB32)
-       *(.noinit.$RAM3.*)
-       *(.noinit.$RamAHB32.*)
-       . = ALIGN(4) ;
-    } > RamAHB32
-
-    /* NOINIT section for RamAHB16 */
-    .noinit_RAM4 (NOLOAD) :
-    {
-       . = ALIGN(4) ;
-       *(.noinit.$RAM4)
-       *(.noinit.$RamAHB16)
-       *(.noinit.$RAM4.*)
-       *(.noinit.$RamAHB16.*)
-       . = ALIGN(4) ;
-    } > RamAHB16
-
-    /* NOINIT section for RamAHB_ETB16 */
-    .noinit_RAM5 (NOLOAD) :
-    {
-       . = ALIGN(4) ;
-       *(.noinit.$RAM5)
-       *(.noinit.$RamAHB_ETB16)
-       *(.noinit.$RAM5.*)
-       *(.noinit.$RamAHB_ETB16.*)
-       . = ALIGN(4) ;
-    } > RamAHB_ETB16
-
-    /* DEFAULT NOINIT SECTION */
-    .noinit (NOLOAD):
-    {
-         . = ALIGN(4) ;
-        _noinit = .;
-        *(.noinit*)
-         . = ALIGN(4) ;
-        _end_noinit = .;
-    } > RamLoc128
-    PROVIDE(_pvHeapStart = DEFINED(__user_heap_base) ? __user_heap_base : .);
-    PROVIDE(_vStackTop = DEFINED(__user_stack_top) ? __user_stack_top : __top_RamLoc128 - 0);
-
-    /* ## Create checksum value (used in startup) ## */
-    PROVIDE(__valid_user_code_checksum = 0 -
-                                         (_vStackTop
-                                         + (ResetISR + 1)
-                                         + (NMI_Handler + 1)
-                                         + (HardFault_Handler + 1)
-                                         + (( DEFINED(MemManage_Handler) ? MemManage_Handler : 0 ) + 1)   /* MemManage_Handler may not be defined */
-                                         + (( DEFINED(BusFault_Handler) ? BusFault_Handler : 0 ) + 1)     /* BusFault_Handler may not be defined */
-                                         + (( DEFINED(UsageFault_Handler) ? UsageFault_Handler : 0 ) + 1) /* UsageFault_Handler may not be defined */
-                                         ) );
-
-    /* Provide basic symbols giving location and size of main text
-     * block, including initial values of RW data sections. Note that
-     * these will need extending to give a complete picture with
-     * complex images (e.g multiple Flash banks).
-     */
-    _image_start = LOADADDR(.text);
-    _image_end = LOADADDR(.data) + SIZEOF(.data);
-    _image_size = _image_end - _image_start;
-}

hw/bsp/nrf/family.mk

@@ -13,9 +13,16 @@ CFLAGS += \
   -DCONFIG_GPIO_AS_PINRESET
 
 # suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align -Wno-error=cast-qual -Wno-error=redundant-decls
+CFLAGS += \
+  -Wno-error=undef \
+  -Wno-error=unused-parameter \
+  -Wno-error=cast-align \
+  -Wno-error=cast-qual \
+  -Wno-error=redundant-decls
 
-LDFLAGS += -L$(TOP)/${NRFX_DIR}/mdk
+LDFLAGS += \
+  -specs=nosys.specs -specs=nano.specs \
+  -L$(TOP)/${NRFX_DIR}/mdk
 
 SRC_C += \
   src/portable/nordic/nrf5x/dcd_nrf5x.c \

hw/bsp/nutiny_nuc121s/board.mk

@@ -13,6 +13,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=redundant-decls
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/$(BOARD)/nuc121_flash.ld
 

hw/bsp/nutiny_nuc125s/board.mk

@@ -13,6 +13,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=redundant-decls
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/$(BOARD)/nuc125_flash.ld
 

hw/bsp/nutiny_nuc126v/board.mk

@@ -14,6 +14,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=redundant-decls
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/$(BOARD)/nuc126_flash.ld
 

hw/bsp/nutiny_sdk_nuc120/board.mk

@@ -9,6 +9,8 @@ CFLAGS += \
   -DCFG_EXAMPLE_VIDEO_READONLY \
   -DCFG_TUSB_MCU=OPT_MCU_NUC120
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/nutiny_sdk_nuc120/nuc120_flash.ld
 

hw/bsp/nutiny_sdk_nuc505/board.mk

@@ -12,6 +12,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=redundant-decls
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/$(BOARD)/nuc505_flashtoram.ld
 

hw/bsp/ra/family.mk

@@ -31,6 +31,8 @@ else
   $(info "Using PORT 0 FullSpeed")
 endif
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/renesas/rusb2/dcd_rusb2.c \
 	src/portable/renesas/rusb2/hcd_rusb2.c \

hw/bsp/rx/family.mk

@@ -16,6 +16,8 @@ CFLAGS += \
 # suppress warning caused by vendor mcu driver
 CFLAGS += -Wno-error=redundant-decls
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/renesas/rusb2/dcd_rusb2.c \
 	src/portable/renesas/rusb2/hcd_rusb2.c \

hw/bsp/samd11/family.mk

@@ -18,6 +18,8 @@ CFLAGS += -Wno-error=redundant-decls
 # SAM driver is flooded with -Wcast-qual which slow down complication significantly
 CFLAGS_SKIP += -Wcast-qual
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/microchip/samd/dcd_samd.c \
 	hw/mcu/microchip/samd11/gcc/gcc/startup_samd11.c \

hw/bsp/samd21/family.mk

@@ -16,6 +16,8 @@ CFLAGS += -Wno-error=redundant-decls
 # SAM driver is flooded with -Wcast-qual which slow down complication significantly
 CFLAGS_SKIP += -Wcast-qual
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/microchip/samd/dcd_samd.c \
 	${SDK_DIR}/gcc/gcc/startup_samd21.c \

hw/bsp/samd51/family.mk

@@ -12,6 +12,8 @@ CFLAGS += \
 # SAM driver is flooded with -Wcast-qual which slow down complication significantly
 CFLAGS_SKIP += -Wcast-qual
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/microchip/samd/dcd_samd.c \
 	hw/mcu/microchip/samd51/gcc/gcc/startup_samd51.c \

hw/bsp/same5x/family.mk

@@ -13,6 +13,8 @@ CFLAGS += \
 # SAM driver is flooded with -Wcast-qual which slow down complication significantly
 CFLAGS_SKIP += -Wcast-qual
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
   src/portable/microchip/samd/dcd_samd.c \
   $(SDK_DIR)/gcc/gcc/startup_$(MCU).c \

hw/bsp/same70_qmtech/board.mk

@@ -1,4 +1,5 @@
 DEPS_SUBMODULES += hw/mcu/microchip
+ASF_DIR = hw/mcu/microchip/same70
 
 CFLAGS += \
   -mthumb \
@@ -16,7 +17,7 @@ CFLAGS += -Wno-error=unused-parameter -Wno-error=cast-align -Wno-error=redundant
 # SAM driver is flooded with -Wcast-qual which slow down complication significantly
 CFLAGS_SKIP += -Wcast-qual
 
-ASF_DIR = hw/mcu/microchip/same70
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 # All source paths should be relative to the top level.
 LD_FILE = $(ASF_DIR)/same70b/gcc/gcc/same70q21b_flash.ld

hw/bsp/same70_xplained/board.mk

@@ -1,4 +1,5 @@
 DEPS_SUBMODULES += hw/mcu/microchip
+ASF_DIR = hw/mcu/microchip/same70
 
 CFLAGS += \
   -mthumb \
@@ -16,7 +17,7 @@ CFLAGS += -Wno-error=unused-parameter -Wno-error=cast-align -Wno-error=redundant
 # SAM driver is flooded with -Wcast-qual which slow down complication significantly
 CFLAGS_SKIP += -Wcast-qual
 
-ASF_DIR = hw/mcu/microchip/same70
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 # All source paths should be relative to the top level.
 LD_FILE = $(ASF_DIR)/same70b/gcc/gcc/same70q21b_flash.ld

hw/bsp/samg55xplained/board.mk

@@ -1,4 +1,5 @@
 DEPS_SUBMODULES += hw/mcu/microchip
+ASF_DIR = hw/mcu/microchip/samg55
 
 CFLAGS += \
   -flto \
@@ -17,7 +18,7 @@ CFLAGS += -Wno-error=undef -Wno-error=null-dereference -Wno-error=redundant-decl
 # SAM driver is flooded with -Wcast-qual which slow down complication significantly
 CFLAGS_SKIP += -Wcast-qual
 
-ASF_DIR = hw/mcu/microchip/samg55
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/$(BOARD)/samg55j19_flash.ld

hw/bsp/saml2x/family.mk

@@ -16,6 +16,8 @@ CFLAGS += -Wno-error=redundant-decls
 # SAM driver is flooded with -Wcast-qual which slow down complication significantly
 CFLAGS_SKIP += -Wcast-qual
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/microchip/samd/dcd_samd.c \
 	$(MCU_DIR)/gcc/gcc/startup_$(SAML_VARIANT).c \

hw/bsp/sltb009a/board.mk

@@ -19,6 +19,8 @@ SILABS_CMSIS = hw/mcu/silabs/cmsis-dfp-$(SILABS_FAMILY)/Device/SiliconLabs/$(she
 DEPS_SUBMODULES += hw/mcu/silabs/cmsis-dfp-$(SILABS_FAMILY)
 DEPS_SUBMODULES += lib/CMSIS_5
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # All source paths should be relative to the top level.
 LD_FILE = $(SILABS_CMSIS)/Source/GCC/$(SILABS_FAMILY).ld
 

hw/bsp/spresense/board.mk

@@ -38,6 +38,8 @@ CFLAGS += \
 # lwip/src/core/raw.c:334:43: error: declaration of 'recv' shadows a global declaration
 CFLAGS += -Wno-error=shadow  -Wno-error=redundant-decls
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SPRESENSE_SDK = $(TOP)/hw/mcu/sony/cxd56/spresense-exported-sdk
 
 SRC_C += src/portable/sony/cxd56/dcd_cxd56.c

hw/bsp/stm32f0/family.mk

@@ -23,6 +23,8 @@ CFLAGS_GCC += \
 # suppress warning caused by vendor mcu driver
 CFLAGS_GCC += -Wno-error=unused-parameter -Wno-error=cast-align
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # ------------------------
 # All source paths should be relative to the top level.
 # ------------------------

hw/bsp/stm32f1/family.mk

@@ -18,6 +18,8 @@ CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles \
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # ------------------------
 # All source paths should be relative to the top level.
 # ------------------------

hw/bsp/stm32f2/family.mk

@@ -21,6 +21,8 @@ CFLAGS_GCC += \
 # mcu driver cause following warnings
 CFLAGS_GCC += -Wno-error=sign-compare
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
   src/portable/synopsys/dwc2/dcd_dwc2.c \
   $(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \

hw/bsp/stm32f3/family.mk

@@ -19,6 +19,8 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=unused-parameter
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
   src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
   $(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \

hw/bsp/stm32f4/family.mk

@@ -25,6 +25,8 @@ CFLAGS_GCC += \
 # suppress warning caused by vendor mcu driver
 CFLAGS_GCC += -Wno-error=cast-align
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # -----------------
 # Sources & Include
 # -----------------

hw/bsp/stm32f7/family.mk

@@ -35,6 +35,8 @@ CFLAGS_GCC += \
 # mcu driver cause following warnings
 CFLAGS_GCC += -Wno-error=cast-align
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # -----------------
 # Sources & Include
 # -----------------

hw/bsp/stm32g0/family.mk

@@ -21,6 +21,8 @@ CFLAGS_GCC += \
 # suppress warning caused by vendor mcu driver
 CFLAGS_GCC += -Wno-error=cast-align
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # -----------------
 # Sources & Include
 # -----------------

hw/bsp/stm32g4/family.mk

@@ -22,6 +22,8 @@ CFLAGS_GCC += \
 # suppress warning caused by vendor mcu driver
 CFLAGS_GCC += -Wno-error=cast-align
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # -----------------
 # Sources & Include
 # -----------------

hw/bsp/stm32h7/family.mk

@@ -35,6 +35,8 @@ CFLAGS_GCC += \
 # suppress warning caused by vendor mcu driver
 CFLAGS_GCC += -Wno-error=maybe-uninitialized -Wno-error=cast-align -Wno-error=unused-parameter
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # -----------------
 # Sources & Include
 # -----------------

hw/bsp/stm32l0/family.mk

@@ -24,6 +24,8 @@ CFLAGS += \
 	-Wno-error=cast-align \
 	-Wno-error=maybe-uninitialized
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
   src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
   $(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \

hw/bsp/stm32l4/family.mk

@@ -21,6 +21,8 @@ CFLAGS_GCC += \
 # suppress warning caused by vendor mcu driver
 CFLAGS_GCC += -Wno-error=maybe-uninitialized -Wno-error=cast-align
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 # -----------------
 # Sources & Include
 # -----------------

hw/bsp/stm32u5/family.mk

@@ -15,6 +15,8 @@ CFLAGS += \
 # suppress warning caused by vendor mcu driver
 CFLAGS += -Wno-error=maybe-uninitialized -Wno-error=cast-align -Wno-error=undef -Wno-error=unused-parameter
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/synopsys/dwc2/dcd_dwc2.c \
 	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \

hw/bsp/stm32wb/family.mk

@@ -16,6 +16,8 @@ CFLAGS += \
 # suppress warning caused by vendor mcu driver
 CFLAGS += -Wno-error=cast-align -Wno-unused-parameter
 
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
+
 SRC_C += \
 	src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
 	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \

hw/bsp/tm4c123/family.mk

@@ -1,4 +1,5 @@
 DEPS_SUBMODULES += hw/mcu/ti
+MCU_DIR=hw/mcu/ti/tm4c123xx
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 CPU_CORE ?= cortex-m4
@@ -12,7 +13,7 @@ CFLAGS += \
 # mcu driver cause following warnings
 CFLAGS += -Wno-error=strict-prototypes -Wno-error=cast-qual
 
-MCU_DIR=hw/mcu/ti/tm4c123xx/
+LDFLAGS_GCC += -specs=nosys.specs -specs=nano.specs
 
 # All source paths should be relative to the top level.
 LD_FILE = $(BOARD_PATH)/tm4c123.ld