diff --git a/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk b/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
index 1cc443352..f8f0952e8 100644
--- a/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
+++ b/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
@@ -1,12 +1,7 @@
 CFLAGS += -DSTM32F070xB -DCFG_EXAMPLE_VIDEO_READONLY
 
-# GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f070xb.s
-GCC_LD_FILE = $(BOARD_PATH)/stm32F070rbtx_flash.ld
-
-# IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f070xb.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f070xb_flash.icf
+# Linker
+LD_FILE_GCC = $(BOARD_PATH)/stm32F070rbtx_flash.ld
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f070rb
diff --git a/hw/bsp/stm32f0/boards/stm32f072disco/board.mk b/hw/bsp/stm32f0/boards/stm32f072disco/board.mk
index 4216ba186..57c658629 100644
--- a/hw/bsp/stm32f0/boards/stm32f072disco/board.mk
+++ b/hw/bsp/stm32f0/boards/stm32f072disco/board.mk
@@ -1,10 +1,9 @@
+MCU_VARIANT = stm32f072xb
+
 CFLAGS += -DSTM32F072xB -DCFG_EXAMPLE_VIDEO_READONLY
 
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f072xb.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F072RBTx_FLASH.ld
-
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f072xb.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f072xb_flash.icf
+# Linker
+LD_FILE_GCC = $(BOARD_PATH)/STM32F072RBTx_FLASH.ld
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f072rb
diff --git a/hw/bsp/stm32f0/boards/stm32f072eval/board.mk b/hw/bsp/stm32f0/boards/stm32f072eval/board.mk
index bb9cba22a..c368bd8af 100644
--- a/hw/bsp/stm32f0/boards/stm32f072eval/board.mk
+++ b/hw/bsp/stm32f0/boards/stm32f072eval/board.mk
@@ -1,10 +1,10 @@
 CFLAGS += -DSTM32F072xB -DLSI_VALUE=40000 -DCFG_EXAMPLE_VIDEO_READONLY
 
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f072xb.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F072VBTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f072xb.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F072VBTx_FLASH.ld
 
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f072xb.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f072xb_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f072xb.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f072xb_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f072vb
diff --git a/hw/bsp/stm32f0/family.mk b/hw/bsp/stm32f0/family.mk
index 200c4f757..129a3b73a 100644
--- a/hw/bsp/stm32f0/family.mk
+++ b/hw/bsp/stm32f0/family.mk
@@ -16,12 +16,12 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_STM32F0
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles \
 
 # suppress warning caused by vendor mcu driver
-GCC_CFLAGS += -Wno-error=unused-parameter -Wno-error=cast-align
+CFLAGS_GCC += -Wno-error=unused-parameter -Wno-error=cast-align
 
 # ------------------------
 # All source paths should be relative to the top level.
@@ -44,3 +44,10 @@ INC += \
   $(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
   $(TOP)/$(ST_CMSIS)/Include \
   $(TOP)/$(ST_HAL_DRIVER)/Inc
+
+# Startup
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_$(MCU_VARIANT).s
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_$(MCU_VARIANT).s
+
+# Linker
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/$(MCU_VARIANT)_flash.icf
diff --git a/hw/bsp/stm32f1/boards/stm32f103_bluepill/board.mk b/hw/bsp/stm32f1/boards/stm32f103_bluepill/board.mk
index 159b3ecb6..6c5f34501 100644
--- a/hw/bsp/stm32f1/boards/stm32f103_bluepill/board.mk
+++ b/hw/bsp/stm32f1/boards/stm32f103_bluepill/board.mk
@@ -1,12 +1,10 @@
+MCU_VARIANT = stm32f103xb
+
 CFLAGS += -DSTM32F103xB -DHSE_VALUE=8000000U -DCFG_EXAMPLE_VIDEO_READONLY
 
-# GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f103xb.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F103X8_FLASH.ld
-
-# IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f103xb.s
-IAR_LD_FILE = $(BOARD_PATH)/stm32f103x8_flash.icf
+# Linker
+LD_FILE_GCC = $(BOARD_PATH)/STM32F103X8_FLASH.ld
+LD_FILE_IAR = $(BOARD_PATH)/stm32f103x8_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f103c8
diff --git a/hw/bsp/stm32f1/boards/stm32f103_mini_2/board.mk b/hw/bsp/stm32f1/boards/stm32f103_mini_2/board.mk
index efea75be7..7e95c1fe1 100644
--- a/hw/bsp/stm32f1/boards/stm32f103_mini_2/board.mk
+++ b/hw/bsp/stm32f1/boards/stm32f103_mini_2/board.mk
@@ -1,12 +1,10 @@
+MCU_VARIANT = stm32f103xb
+
 CFLAGS += -DSTM32F103xB -DHSE_VALUE=8000000U
 
-# GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f103xb.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F103XC_FLASH.ld
-
-# IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f103xb.s
-IAR_LD_FILE = $(BOARD_PATH)/stm32f103xc_flash.icf
+# Linker
+LD_FILE_GCC = $(BOARD_PATH)/STM32F103XC_FLASH.ld
+LD_FILE_IAR = $(BOARD_PATH)/stm32f103xc_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f103rc
diff --git a/hw/bsp/stm32f1/family.mk b/hw/bsp/stm32f1/family.mk
index 4813fba2b..c9321c3cb 100644
--- a/hw/bsp/stm32f1/family.mk
+++ b/hw/bsp/stm32f1/family.mk
@@ -14,7 +14,7 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_STM32F1
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles \
 
@@ -36,6 +36,10 @@ INC += \
   $(TOP)/$(ST_CMSIS)/Include \
   $(TOP)/$(ST_HAL_DRIVER)/Inc
 
+# Startup
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_$(MCU_VARIANT).s
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_$(MCU_VARIANT).s
+
 # flash target ROM bootloader
 flash-dfu-util: $(BUILD)/$(PROJECT).bin
 	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<
diff --git a/hw/bsp/stm32f2/family.mk b/hw/bsp/stm32f2/family.mk
index fd27c0e68..ce50b16ad 100644
--- a/hw/bsp/stm32f2/family.mk
+++ b/hw/bsp/stm32f2/family.mk
@@ -14,12 +14,12 @@ CPU_CORE ?= cortex-m3
 CFLAGS += \
 	-DCFG_TUSB_MCU=OPT_MCU_STM32F2
 
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles \
 
 # mcu driver cause following warnings
-GCC_CFLAGS += -Wno-error=sign-compare
+CFLAGS_GCC += -Wno-error=sign-compare
 
 SRC_C += \
   src/portable/synopsys/dwc2/dcd_dwc2.c \
diff --git a/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk b/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk
index 1962dd9d8..cfd1d8b3b 100644
--- a/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk
+++ b/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F405xx
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f405xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f405xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f405xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f405xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f405rg
diff --git a/hw/bsp/stm32f4/boards/pyboardv11/board.mk b/hw/bsp/stm32f4/boards/pyboardv11/board.mk
index 0a9100e1e..4c52e004a 100644
--- a/hw/bsp/stm32f4/boards/pyboardv11/board.mk
+++ b/hw/bsp/stm32f4/boards/pyboardv11/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F405xx
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f405xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f405xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f405xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f405xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f405rg
diff --git a/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk b/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk
index 11f9b81aa..3285bd232 100644
--- a/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F401xC
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f401xc.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F401VCTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f401xc.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F401VCTx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f401xc.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f401xc_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f401xc.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f401xc_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f401cc
diff --git a/hw/bsp/stm32f4/boards/stm32f407disco/board.mk b/hw/bsp/stm32f4/boards/stm32f407disco/board.mk
index a184804d3..4de656b0c 100644
--- a/hw/bsp/stm32f4/boards/stm32f407disco/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f407disco/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F407xx
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f407xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F407VGTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f407xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F407VGTx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f407xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f407xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f407xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f407xx_flash.icf
 
 
 # For flash-jlink target
diff --git a/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk b/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk
index ac15eaa5d..7af7ca47c 100644
--- a/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F411xE
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F411CEUx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F411CEUx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f411xe.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f411xe_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f411xe.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f411xe_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f411ce
diff --git a/hw/bsp/stm32f4/boards/stm32f411disco/board.mk b/hw/bsp/stm32f4/boards/stm32f411disco/board.mk
index c5736050c..09fa50bd3 100644
--- a/hw/bsp/stm32f4/boards/stm32f411disco/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f411disco/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F411xE
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F411VETx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F411VETx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f411xe.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f411xe_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f411xe.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f411xe_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f411ve
diff --git a/hw/bsp/stm32f4/boards/stm32f412disco/board.mk b/hw/bsp/stm32f4/boards/stm32f412disco/board.mk
index 7dc3699e0..f767ac6c4 100644
--- a/hw/bsp/stm32f4/boards/stm32f412disco/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f412disco/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F412Zx
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f412zx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f412zx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f412zx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f412zx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f412zg
diff --git a/hw/bsp/stm32f4/boards/stm32f412nucleo/board.mk b/hw/bsp/stm32f4/boards/stm32f412nucleo/board.mk
index 7dc3699e0..f767ac6c4 100644
--- a/hw/bsp/stm32f4/boards/stm32f412nucleo/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f412nucleo/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F412Zx
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f412zx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f412zx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f412zx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f412zx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f412zg
diff --git a/hw/bsp/stm32f4/boards/stm32f439nucleo/board.mk b/hw/bsp/stm32f4/boards/stm32f439nucleo/board.mk
index e1f337a7e..2ab32b7f3 100644
--- a/hw/bsp/stm32f4/boards/stm32f439nucleo/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f439nucleo/board.mk
@@ -1,12 +1,12 @@
 CFLAGS += -DSTM32F439xx
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f439xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F439ZITX_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f439xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F439ZITX_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f439xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f439xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f439xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f439xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f439zi
diff --git a/hw/bsp/stm32f4/family.mk b/hw/bsp/stm32f4/family.mk
index 9c132fd21..38592ecb0 100644
--- a/hw/bsp/stm32f4/family.mk
+++ b/hw/bsp/stm32f4/family.mk
@@ -15,12 +15,12 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_STM32F4
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles
 
 # suppress warning caused by vendor mcu driver
-GCC_CFLAGS += -Wno-error=cast-align
+CFLAGS_GCC += -Wno-error=cast-align
 
 # -----------------
 # Sources & Include
diff --git a/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk b/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk
index e1d352cc9..b59125edc 100644
--- a/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk
+++ b/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk
@@ -7,12 +7,12 @@ CFLAGS += \
   -DHSE_VALUE=25000000 \
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32F723xE_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F723xE_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f723xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f723xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f723xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f723xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/boards/stm32f723disco/board.mk b/hw/bsp/stm32f7/boards/stm32f723disco/board.mk
index 6ddb727c7..168ca5dad 100644
--- a/hw/bsp/stm32f7/boards/stm32f723disco/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f723disco/board.mk
@@ -6,12 +6,12 @@ CFLAGS += \
   -DHSE_VALUE=25000000 \
 
 # GCC
-GCC_LD_FILE = $(BOARD_PATH)/STM32F723xE_FLASH.ld
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F723xE_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f723xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f723xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f723xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f723xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/boards/stm32f746disco/board.mk b/hw/bsp/stm32f7/boards/stm32f746disco/board.mk
index ba31baa16..acda5e2e8 100644
--- a/hw/bsp/stm32f7/boards/stm32f746disco/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f746disco/board.mk
@@ -6,12 +6,12 @@ CFLAGS += \
   -DHSE_VALUE=25000000
 
 # GCC
-GCC_LD_FILE = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f746xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f746xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f746xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f746xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk b/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk
index e4d31040e..511433885 100644
--- a/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk
@@ -6,12 +6,12 @@ CFLAGS += \
   -DHSE_VALUE=8000000
 
 # GCC
-GCC_LD_FILE = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f746xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f746xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f746xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f746xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk b/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk
index be5862612..329771986 100644
--- a/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk
@@ -6,12 +6,12 @@ CFLAGS += \
 	-DHSE_VALUE=8000000 \
 
 # GCC
-GCC_LD_FILE = $(BOARD_PATH)/STM32F767ZITx_FLASH.ld
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f767xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F767ZITx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f767xx.s
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f767xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f767xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f767xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f767xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f767zi
diff --git a/hw/bsp/stm32f7/boards/stm32f769disco/board.mk b/hw/bsp/stm32f7/boards/stm32f769disco/board.mk
index 18f59e8b2..20042db98 100644
--- a/hw/bsp/stm32f7/boards/stm32f769disco/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f769disco/board.mk
@@ -7,12 +7,12 @@ CFLAGS += \
   -DHSE_VALUE=25000000 \
 
 # GCC
-GCC_LD_FILE = $(BOARD_PATH)/STM32F769ZITx_FLASH.ld
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f769xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32F769ZITx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f769xx.s
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f769xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f769xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f769xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f769xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/family.mk b/hw/bsp/stm32f7/family.mk
index 0b3b641d8..1a15a743c 100644
--- a/hw/bsp/stm32f7/family.mk
+++ b/hw/bsp/stm32f7/family.mk
@@ -28,12 +28,12 @@ else
 endif
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles
 
 # mcu driver cause following warnings
-GCC_CFLAGS += -Wno-error=shadow -Wno-error=cast-align
+CFLAGS_GCC += -Wno-error=shadow -Wno-error=cast-align
 
 # -----------------
 # Sources & Include
diff --git a/hw/bsp/stm32g0/boards/stm32g0b1nucleo/board.mk b/hw/bsp/stm32g0/boards/stm32g0b1nucleo/board.mk
index 50f282b09..6a6078d5f 100644
--- a/hw/bsp/stm32g0/boards/stm32g0b1nucleo/board.mk
+++ b/hw/bsp/stm32g0/boards/stm32g0b1nucleo/board.mk
@@ -2,12 +2,12 @@ CFLAGS += \
 	-DSTM32G0B1xx
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32g0b1xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32G0B1RETx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32g0b1xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32G0B1RETx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32g0b1xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32g0b1xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32g0b1xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32g0b1xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32g0b1re
diff --git a/hw/bsp/stm32g0/family.mk b/hw/bsp/stm32g0/family.mk
index 76f1524e5..412c73291 100644
--- a/hw/bsp/stm32g0/family.mk
+++ b/hw/bsp/stm32g0/family.mk
@@ -14,12 +14,12 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_STM32G0
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles
 
 # suppress warning caused by vendor mcu driver
-GCC_CFLAGS += -Wno-error=cast-align
+CFLAGS_GCC += -Wno-error=cast-align
 
 # -----------------
 # Sources & Include
diff --git a/hw/bsp/stm32g4/boards/b_g474e_dpow1/board.mk b/hw/bsp/stm32g4/boards/b_g474e_dpow1/board.mk
index 75cd9d8f5..6266b3ccc 100644
--- a/hw/bsp/stm32g4/boards/b_g474e_dpow1/board.mk
+++ b/hw/bsp/stm32g4/boards/b_g474e_dpow1/board.mk
@@ -1,13 +1,10 @@
+MCU_VARIANT = stm32g474xx
+
 CFLAGS += \
 	-DSTM32G474xx \
 
-# GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32g474xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
-
-# IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32g474xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32g474xx_flash.icf
+# Linker
+LD_FILE_GCC = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
 
 # For flash-jlink target
 JLINK_DEVICE = stm32g474re
diff --git a/hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk b/hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk
index 2f6ec0ed6..dc46af1d1 100644
--- a/hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk
+++ b/hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk
@@ -1,14 +1,11 @@
+MCU_VARIANT = stm32g474xx
+
 CFLAGS += \
 	-DSTM32G474xx \
 	-DHSE_VALUE=24000000
 
-# GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32g474xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
-
-# IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32g474xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32g474xx_flash.icf
+# Linker
+LD_FILE_GCC = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
 
 # For flash-jlink target
 JLINK_DEVICE = stm32g474re
diff --git a/hw/bsp/stm32g4/family.mk b/hw/bsp/stm32g4/family.mk
index 8ee453aed..2efe91449 100644
--- a/hw/bsp/stm32g4/family.mk
+++ b/hw/bsp/stm32g4/family.mk
@@ -15,12 +15,12 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_STM32G4
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles \
 
 # suppress warning caused by vendor mcu driver
-GCC_CFLAGS += -Wno-error=cast-align
+CFLAGS_GCC += -Wno-error=cast-align
 
 # -----------------
 # Sources & Include
@@ -45,5 +45,12 @@ INC += \
 	$(TOP)/$(ST_CMSIS)/Include \
 	$(TOP)/$(ST_HAL_DRIVER)/Inc
 
+# Startup
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_$(MCU_VARIANT).s
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_$(MCU_VARIANT).s
+
+# Linker
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/$(MCU_VARIANT)_flash.icf
+
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32h7/boards/daisyseed/board.mk b/hw/bsp/stm32h7/boards/daisyseed/board.mk
index d53782496..da2eb4433 100644
--- a/hw/bsp/stm32h7/boards/daisyseed/board.mk
+++ b/hw/bsp/stm32h7/boards/daisyseed/board.mk
@@ -4,12 +4,12 @@ CFLAGS += -DSTM32H750xx -DCORE_CM7 -DHSE_VALUE=16000000
 PORT ?= 0
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h750xx.s
-GCC_LD_FILE = $(BOARD_PATH)/stm32h750ibkx_flash.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h750xx.s
+LD_FILE_GCC = $(BOARD_PATH)/stm32h750ibkx_flash.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h750xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h750xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h750xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h750xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h750ibk6_m7
diff --git a/hw/bsp/stm32h7/boards/stm32h723nucleo/board.mk b/hw/bsp/stm32h7/boards/stm32h723nucleo/board.mk
index 9cf241df8..57a316f41 100644
--- a/hw/bsp/stm32h7/boards/stm32h723nucleo/board.mk
+++ b/hw/bsp/stm32h7/boards/stm32h723nucleo/board.mk
@@ -4,12 +4,12 @@ CFLAGS += -DSTM32H723xx -DHSE_VALUE=8000000
 PORT ?= 0
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h723xx.s
-GCC_LD_FILE =  $(FAMILY_PATH)/linker/stm32h723xx_flash.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h723xx.s
+LD_FILE_GCC =  $(FAMILY_PATH)/linker/stm32h723xx_flash.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h723xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h723xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h723xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h723xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h723zg
diff --git a/hw/bsp/stm32h7/boards/stm32h743eval/board.mk b/hw/bsp/stm32h7/boards/stm32h743eval/board.mk
index 558e943b4..36882a0e5 100644
--- a/hw/bsp/stm32h7/boards/stm32h743eval/board.mk
+++ b/hw/bsp/stm32h7/boards/stm32h743eval/board.mk
@@ -5,12 +5,12 @@ PORT ?= 1
 SPEED ?= high
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
-GCC_LD_FILE = $(FAMILY_PATH)/linker/stm32h743xx_flash.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
+LD_FILE_GCC = $(FAMILY_PATH)/linker/stm32h743xx_flash.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h743xi
diff --git a/hw/bsp/stm32h7/boards/stm32h743nucleo/board.mk b/hw/bsp/stm32h7/boards/stm32h743nucleo/board.mk
index 0bff0940e..f641b77aa 100644
--- a/hw/bsp/stm32h7/boards/stm32h743nucleo/board.mk
+++ b/hw/bsp/stm32h7/boards/stm32h743nucleo/board.mk
@@ -4,12 +4,12 @@ CFLAGS += -DSTM32H743xx -DHSE_VALUE=8000000
 PORT ?= 0
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
-GCC_LD_FILE = $(FAMILY_PATH)/linker/stm32h743xx_flash.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
+LD_FILE_GCC = $(FAMILY_PATH)/linker/stm32h743xx_flash.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h743zi
diff --git a/hw/bsp/stm32h7/boards/stm32h745disco/board.mk b/hw/bsp/stm32h7/boards/stm32h745disco/board.mk
index 86347ade7..9c3615f05 100644
--- a/hw/bsp/stm32h7/boards/stm32h745disco/board.mk
+++ b/hw/bsp/stm32h7/boards/stm32h745disco/board.mk
@@ -7,12 +7,12 @@ CFLAGS += -DSTM32H745xx -DCORE_CM7 -DHSE_VALUE=25000000
 PORT ?= 0
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h745xx.s
-GCC_LD_FILE = $(ST_CMSIS)/Source/Templates/gcc/linker/stm32h745xx_flash_CM7.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h745xx.s
+LD_FILE_GCC = $(ST_CMSIS)/Source/Templates/gcc/linker/stm32h745xx_flash_CM7.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h745xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h745xx_flash_CM7.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h745xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h745xx_flash_CM7.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h745xi_m7
diff --git a/hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk b/hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk
index 9997faff9..cea4bfacb 100644
--- a/hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk
+++ b/hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk
@@ -10,12 +10,12 @@ SRC_C += \
   $(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_tim_ex.c
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
-GCC_LD_FILE = $(FAMILY_PATH)/linker/stm32h743xx_flash.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
+LD_FILE_GCC = $(FAMILY_PATH)/linker/stm32h743xx_flash.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h743ii
diff --git a/hw/bsp/stm32h7/family.mk b/hw/bsp/stm32h7/family.mk
index 48730bbb4..a1ff26d0b 100644
--- a/hw/bsp/stm32h7/family.mk
+++ b/hw/bsp/stm32h7/family.mk
@@ -28,12 +28,12 @@ else
 endif
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles
 
 # suppress warning caused by vendor mcu driver
-GCC_CFLAGS += -Wno-error=maybe-uninitialized -Wno-error=cast-align -Wno-error=unused-parameter
+CFLAGS_GCC += -Wno-error=maybe-uninitialized -Wno-error=cast-align -Wno-error=unused-parameter
 
 # -----------------
 # Sources & Include
diff --git a/hw/bsp/stm32l4/boards/stm32l412nucleo/board.mk b/hw/bsp/stm32l4/boards/stm32l412nucleo/board.mk
index 854397fc8..87b333500 100644
--- a/hw/bsp/stm32l4/boards/stm32l412nucleo/board.mk
+++ b/hw/bsp/stm32l4/boards/stm32l412nucleo/board.mk
@@ -2,12 +2,12 @@ CFLAGS += \
   -DSTM32L412xx \
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l412xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32L412KBUx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l412xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32L412KBUx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l412xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l412xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l412xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l412xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32l412kb
diff --git a/hw/bsp/stm32l4/boards/stm32l476disco/board.mk b/hw/bsp/stm32l4/boards/stm32l476disco/board.mk
index 125f1f106..3ba9ab444 100644
--- a/hw/bsp/stm32l4/boards/stm32l476disco/board.mk
+++ b/hw/bsp/stm32l4/boards/stm32l476disco/board.mk
@@ -2,12 +2,12 @@ CFLAGS += \
   -DSTM32L476xx \
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l476xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32L476VGTx_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l476xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32L476VGTx_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l476xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l476xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l476xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l476xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32l476vg
diff --git a/hw/bsp/stm32l4/boards/stm32l4p5nucleo/board.mk b/hw/bsp/stm32l4/boards/stm32l4p5nucleo/board.mk
index 11edcd9a8..84f831878 100644
--- a/hw/bsp/stm32l4/boards/stm32l4p5nucleo/board.mk
+++ b/hw/bsp/stm32l4/boards/stm32l4p5nucleo/board.mk
@@ -2,12 +2,12 @@ CFLAGS += \
   -DSTM32L4P5xx \
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4p5xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32L4P5ZGTX_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4p5xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32L4P5ZGTX_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l4p5xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l4p5xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l4p5xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l4p5xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32l4p5zg
diff --git a/hw/bsp/stm32l4/boards/stm32l4r5nucleo/board.mk b/hw/bsp/stm32l4/boards/stm32l4r5nucleo/board.mk
index 6dca88a8b..ad5bfba38 100644
--- a/hw/bsp/stm32l4/boards/stm32l4r5nucleo/board.mk
+++ b/hw/bsp/stm32l4/boards/stm32l4r5nucleo/board.mk
@@ -3,12 +3,12 @@ CFLAGS += \
   -DSTM32L4R5xx \
 
 # GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4r5xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32L4RXxI_FLASH.ld
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4r5xx.s
+LD_FILE_GCC = $(BOARD_PATH)/STM32L4RXxI_FLASH.ld
 
 # IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l4r5xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l4r5xx_flash.icf
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l4r5xx.s
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l4r5xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32l4r5zi
diff --git a/hw/bsp/stm32l4/family.mk b/hw/bsp/stm32l4/family.mk
index 4392c6766..d492b9645 100644
--- a/hw/bsp/stm32l4/family.mk
+++ b/hw/bsp/stm32l4/family.mk
@@ -14,12 +14,12 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_STM32L4
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles
 
 # suppress warning caused by vendor mcu driver
-GCC_CFLAGS += -Wno-error=maybe-uninitialized -Wno-error=cast-align
+CFLAGS_GCC += -Wno-error=maybe-uninitialized -Wno-error=cast-align
 
 # -----------------
 # Sources & Include
diff --git a/tools/make/toolchain/arm_gcc.mk b/tools/make/toolchain/arm_gcc.mk
index 693fda0b3..bba0607df 100644
--- a/tools/make/toolchain/arm_gcc.mk
+++ b/tools/make/toolchain/arm_gcc.mk
@@ -69,6 +69,3 @@ LDFLAGS += \
 ifneq ($(FAMILY),rx)
 LDFLAGS += -Wl,--print-memory-usage
 endif
-
-LDFLAGS += \
-  -Wl,--print-memory-usage \
diff --git a/tools/make/toolchain/arm_gcc_rules.mk b/tools/make/toolchain/arm_gcc_rules.mk
index a39caf351..2e8b9f911 100644
--- a/tools/make/toolchain/arm_gcc_rules.mk
+++ b/tools/make/toolchain/arm_gcc_rules.mk
@@ -1,4 +1,4 @@
-SRC_S += $(GCC_SRC_S)
+SRC_S += $(SRC_S_GCC)
 
 # Assembly files can be name with upper case .S, convert it to .s
 SRC_S := $(SRC_S:.S=.s)
@@ -9,7 +9,7 @@ SRC_S := $(SRC_S:.S=.s)
 OBJ += $(addprefix $(BUILD)/obj/, $(SRC_S:.s=_asm.o))
 OBJ += $(addprefix $(BUILD)/obj/, $(SRC_C:.c=.o))
 
-CFLAGS += $(GCC_CFLAGS) -MD
+CFLAGS += $(CFLAGS_GCC) -MD
 
 # LTO makes it difficult to analyze map file for optimizing size purpose
 # We will run this option in ci
@@ -27,8 +27,8 @@ ifdef LD_FILE
 LDFLAGS += -Wl,-T,$(TOP)/$(LD_FILE)
 endif
 
-ifdef GCC_LD_FILE
-LDFLAGS += -Wl,-T,$(TOP)/$(GCC_LD_FILE)
+ifdef LD_FILE_GCC
+LDFLAGS += -Wl,-T,$(TOP)/$(LD_FILE_GCC)
 endif
 
 ifneq ($(SKIP_NANOLIB), 1)
diff --git a/tools/make/toolchain/arm_iar_rules.mk b/tools/make/toolchain/arm_iar_rules.mk
index 4b5cc90e3..2c066f6da 100644
--- a/tools/make/toolchain/arm_iar_rules.mk
+++ b/tools/make/toolchain/arm_iar_rules.mk
@@ -1,4 +1,4 @@
-SRC_S += $(IAR_SRC_S)
+SRC_S += $(SRC_S_IAR)
 
 # Assembly files can be name with upper case .S, convert it to .s
 SRC_S := $(SRC_S:.S=.s)
@@ -10,7 +10,7 @@ OBJ += $(addprefix $(BUILD)/obj/, $(SRC_S:.s=_asm.o))
 OBJ += $(addprefix $(BUILD)/obj/, $(SRC_C:.c=.o))
 
 # Linker script
-LDFLAGS += --config $(TOP)/$(IAR_LD_FILE)
+LDFLAGS += --config $(TOP)/$(LD_FILE_IAR)
 
 # ---------------------------------------
 # Rules