From 9f01005da04951e53bd14cea105606c32cac15ed Mon Sep 17 00:00:00 2001 From: Matt DeVillier Date: Fri, 8 Sep 2023 12:56:52 -0500 Subject: soc/amd/common/graphics: Update VBIOS cache data before hashing On the first boot after flashing, the data read from the FMAP and stored in vbios_data is not valid, so hashing it produces a value which will not match on the subsequent boot, requiring an additional boot before the vbios_data and hash match / before the GOP driver can be skipped. To fix this, update vbios_data before hashing. BUG=b:271850970 BRANCH=skyrim TEST=build/boot google/skyrim with USE_SELECTIVE_GOP_INIT selected, verify that GOP driver execution is skipping on 2nd boot after flashing when booting in normal / verified boot mode. Change-Id: Idc10d752bfa004a34b91307a743c620fb97eeb82 Signed-off-by: Matt DeVillier Reviewed-on: https://review.coreboot.org/c/coreboot/+/77727 Reviewed-by: Martin L Roth Tested-by: build bot (Jenkins) Reviewed-by: Karthik Ramasubramanian --- src/soc/amd/common/block/graphics/graphics.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'src/soc') diff --git a/src/soc/amd/common/block/graphics/graphics.c b/src/soc/amd/common/block/graphics/graphics.c index 93f71f9ce9..4d33cadf94 100644 --- a/src/soc/amd/common/block/graphics/graphics.c +++ b/src/soc/amd/common/block/graphics/graphics.c @@ -244,6 +244,9 @@ static void write_vbios_cache_to_fmap(void *unused) VBIOS_CACHE_FMAP_SIZE) != VBIOS_CACHE_FMAP_SIZE) printk(BIOS_ERR, "Failed to save vbios data to flash; rdev_writeat() failed.\n"); + /* copy modified vbios data from PCI_VGA_RAM_IMAGE_START to buffer before hashing */ + memcpy(vbios_data, (void *)PCI_VGA_RAM_IMAGE_START, VBIOS_CACHE_FMAP_SIZE); + /* save data hash to TPM NVRAM for validation on subsequent boots */ vbios_cache_update_hash(vbios_data, VBIOS_CACHE_FMAP_SIZE); -- cgit v1.2.3