src/cpu/amd/agesa/Makefile.inc - coreboot - Gitiles

 # SPDX-License-Identifier: GPL-2.0-only
 romstage-y += ../../../soc/amd/common/block/cpu/smm/smm_helper.c
 postcar-y += ../../../soc/amd/common/block/cpu/smm/smm_helper.c
 ramstage-y += ../../../soc/amd/common/block/cpu/smm/smm_helper.c
	# SPDX-License-Identifier: GPL-2.0-only
	romstage-y += ../../../soc/amd/common/block/cpu/smm/smm_helper.c
	postcar-y += ../../../soc/amd/common/block/cpu/smm/smm_helper.c
	ramstage-y += ../../../soc/amd/common/block/cpu/smm/smm_helper.c