added stm32f401 blackpill

hw/bsp/stm32f401blackpill/board.mk

@@ -0,0 +1,47 @@
+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_HAL_DRIVER = hw/mcu/st/st_driver/STM32F4xx_HAL_Driver
+ST_CMSIS = hw/mcu/st/st_driver/CMSIS/Device/ST/STM32F4xx
+
+# 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_stm32f4xx.c \
+	$(ST_HAL_DRIVER)/Src/stm32f4xx_hal.c \
+	$(ST_HAL_DRIVER)/Src/stm32f4xx_hal_cortex.c \
+	$(ST_HAL_DRIVER)/Src/stm32f4xx_hal_rcc.c \
+	$(ST_HAL_DRIVER)/Src/stm32f4xx_hal_gpio.c
+
+SRC_S += \
+	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32f401xc.s
+
+INC += \
+	$(TOP)/hw/mcu/st/st_driver/CMSIS/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
+JLINK_IF = swd
+
+# flash target ROM bootloader
+flash: $(BUILD)/$(BOARD)-firmware.bin
+	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<