_CFLAGS=-march=armv4t $(CFLAGS)
_ASFLAGS=-march=armv4t $(ASFLAGS)
_LDFLAGS=$(LDFLAGS)

OBJECTS=rom_header.o hello.o

rom.bin: rom.elf checksum Makefile
	arm-none-eabi-objcopy -O binary $< $@
	./checksum $@

rom.elf: $(OBJECTS) rom.ld Makefile
	arm-none-eabi-ld $(_LDFLAGS) -T rom.ld -Map=rom.map -o $@ $(OBJECTS)

%.o: %.c Makefile
	arm-none-eabi-gcc $(_CFLAGS) -c -o $@ $<

%.o: %.S Makefile
	arm-none-eabi-as $(_ASFLAGS) -o $@ $<

checksum: checksum.c

.PHONY: claen
clean:
	rm -rf $(OBJECTS) rom.bin rom.elf checksum