target VENDOR_MAINBOARD mainboard VENDOR/MAINBOARD option CC="CROSSCC" option CONFIG_CROSS_COMPILE="CROSS_PREFIX" option HOSTCC="CROSS_HOSTCC" __COMPRESSION__ __LOGLEVEL__ romimage "fallback" option CONFIG_USE_FALLBACK_IMAGE=1 option COREBOOT_EXTRA_VERSION=".0Fallback" payload __PAYLOAD__ end buildrom ./coreboot.rom CONFIG_ROM_SIZE "fallback"