samd/Makefile: Specify UF2 family in firmware.uf2.

Set the UF2 firmware images family to Microchip SAMD21 or SAMD51.  This
helps tools such as file to identify built firmware.

Signed-off-by: Alexandre Iooss <erdnaxe@crans.org>

Author: erdnaxe

ports/samd/Makefile

@@ -183,7 +183,7 @@ $(BUILD)/firmware.bin: $(BUILD)/firmware.elf
 	$(Q)$(OBJCOPY) -O binary -j .isr_vector -j .text -j .data $^ $(BUILD)/firmware.bin
 
 $(BUILD)/firmware.uf2: $(BUILD)/firmware.bin
-	$(Q)$(PYTHON) $(UF2CONV) -b $(TEXT0) -c -o $@ $<
+	$(Q)$(PYTHON) $(UF2CONV) $(UF2CONV_FLAGS) -b $(TEXT0) -c -o $@ $<
 
 # pin_af.c: $(BUILD)/$(GEN_PIN_AF) | $(HEADER_BUILD)
 

ports/samd/mcu/samd21/mpconfigmcu.mk

@@ -13,3 +13,5 @@ endif
 MICROPY_VFS_LFS1 ?= 1
 
 SRC_S += shared/runtime/gchelper_thumb1.s
+
+UF2CONV_FLAGS += -f 0x68ed2b88

ports/samd/mcu/samd51/mpconfigmcu.mk

@@ -14,3 +14,5 @@ SRC_S += shared/runtime/gchelper_thumb2.s
 
 SRC_C += \
 	fatfs_port.c \
+
+UF2CONV_FLAGS += -f 0x55114460