$(MAKE) F_CPU=12000000 DEVICE=atmega88 do_firmware
$(MAKE) F_CPU=12000000 DEVICE=atmega328p do_firmware
$(MAKE) F_CPU=16000000 DEVICE=atmega328p do_firmware
$(MAKE) F_CPU=12000000 DEVICE=atmega88 do_firmware
$(MAKE) F_CPU=12000000 DEVICE=atmega328p do_firmware
$(MAKE) F_CPU=16000000 DEVICE=atmega328p do_firmware