src/mainboard/hp/z220_series/Makefile.inc - coreboot - Gitiles

 bootblock-y += variants/$(VARIANT_DIR)/gpio.c
 romstage-y += variants/$(VARIANT_DIR)/gpio.c
 ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
 bootblock-y += early_init.c
 romstage-y += early_init.c
	bootblock-y += variants/$(VARIANT_DIR)/gpio.c
	romstage-y += variants/$(VARIANT_DIR)/gpio.c
	ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
	bootblock-y += early_init.c
	romstage-y += early_init.c