diff options
| author | Matt DeVillier <matt.devillier@amd.corp-partner.google.com> | 2023-09-08 12:56:52 -0500 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2023-09-25 14:11:38 +0000 |
| commit | 9f01005da04951e53bd14cea105606c32cac15ed (patch) | |
| tree | fbb8b9a40d4a37139c825d5758834c1520f6cbaf /src/soc | |
| parent | d5f5dd7984a3e3a9938dcb282dfbe199186d1e3e (diff) | |
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 <matt.devillier@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77727
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Diffstat (limited to 'src/soc')
| -rw-r--r-- | src/soc/amd/common/block/graphics/graphics.c | 3 |
1 files changed, 3 insertions, 0 deletions
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); |