Add stm32l4r5nucleo. USB and UARTwork.

USB runs from LSE stabilized MSI48
LPUART on PORTG needs VDDIO2 enabled.

hw/bsp/stm32l4r5nucleo/board.mk

@@ -0,0 +1,49 @@
+CFLAGS += \
+  -flto \
+  -mthumb \
+  -mabi=aapcs \
+  -mcpu=cortex-m4 \
+  -mfloat-abi=hard \
+  -mfpu=fpv4-sp-d16 \
+  -nostdlib -nostartfiles \
+  -DHSE_VALUE=8000000 \
+  -DSTM32L4R5xx \
+  -DCFG_TUSB_MCU=OPT_MCU_STM32L4
+
+# suppress warning caused by vendor mcu driver
+CFLAGS +=  -Wno-error=maybe-uninitialized -Wno-error=cast-align
+
+ST_HAL_DRIVER = hw/mcu/st/st_driver/STM32L4xx_HAL_Driver
+ST_CMSIS = hw/mcu/st/st_driver/CMSIS/Device/ST/STM32L4xx
+
+# All source paths should be relative to the top level.
+LD_FILE = hw/bsp/$(BOARD)/STM32L4RXxI_FLASH.ld
+
+SRC_C += \
+	$(ST_CMSIS)/Source/Templates/system_stm32l4xx.c \
+	$(ST_HAL_DRIVER)/Src/stm32l4xx_hal.c \
+	$(ST_HAL_DRIVER)/Src/stm32l4xx_hal_cortex.c \
+	$(ST_HAL_DRIVER)/Src/stm32l4xx_hal_rcc.c \
+	$(ST_HAL_DRIVER)/Src/stm32l4xx_hal_rcc_ex.c \
+	$(ST_HAL_DRIVER)/Src/stm32l4xx_hal_gpio.c \
+	$(ST_HAL_DRIVER)/Src/stm32l4xx_hal_uart.c \
+	$(ST_HAL_DRIVER)/Src/stm32l4xx_hal_pwr_ex.c
+
+SRC_S += \
+	$(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4r5xx.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
+
+# flash target using on-board stlink
+flash: flash-stlink