minimal/Makefile: Split rule for firmware.bin generation.

minimal/Makefile

@@ -68,9 +68,11 @@ $(BUILD)/firmware.elf: $(OBJ)
 	$(Q)$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)
 	$(Q)$(SIZE) $@
 
-$(BUILD)/firmware.dfu: $(BUILD)/firmware.elf
-	$(ECHO) "Create $@"
+$(BUILD)/firmware.bin: $(BUILD)/firmware.elf
 	$(Q)$(OBJCOPY) -O binary -j .isr_vector -j .text -j .data $^ $(BUILD)/firmware.bin
+
+$(BUILD)/firmware.dfu: $(BUILD)/firmware.bin
+	$(ECHO) "Create $@"
 	$(Q)$(PYTHON) $(DFU) -b 0x08000000:$(BUILD)/firmware.bin $@
 
 deploy: $(BUILD)/firmware.dfu