device/pci_rom: Set VBIOS checksum when filling VFCT table
AMD's Windows display drivers validate the checksum of the VBIOS data
in the VFCT table (which gets modified by the FSP GOP driver), so
ensure it is set correctly after copying the VBIOS into the table if the
FSP GOP driver was run. Without the correct checksum, the Windows GPU
drivers will fail to load with a code 43 error in Device Manager.
Thanks to coolstar for root causing the issue.
TEST=build/boot Win11 on google/skyrim (frostflow), ensure GPU driver
loaded and functional.
Change-Id: I809f87865fd2a25fb106444574b619746aec068d
Signed-off-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Signed-off-by: CoolStar <coolstarorganization@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77628
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
diff --git a/src/device/pci_rom.c b/src/device/pci_rom.c
index a454c9e..debefb2 100644
--- a/src/device/pci_rom.c
+++ b/src/device/pci_rom.c
@@ -245,10 +245,19 @@
header->PCIFunction = PCI_FUNC(device->path.pci.devfn);
header->PCIDevice = PCI_SLOT(device->path.pci.devfn);
header->ImageLength = rom->size * 512;
- memcpy((void *)&header->VbiosContent, rom, header->ImageLength);
+ memcpy((void *)header->VbiosContent, rom, header->ImageLength);
vfct_struct->VBIOSImageOffset = (size_t)header - (size_t)vfct_struct;
+ /* Calculate and set checksum for VBIOS data if FSP GOP driver used,
+ Since GOP driver modifies ATOMBIOS tables at end of VBIOS */
+ if (CONFIG(RUN_FSP_GOP)) {
+ /* Clear existing checksum before recalculating */
+ header->VbiosContent[VFCT_VBIOS_CHECKSUM_OFFSET] = 0;
+ header->VbiosContent[VFCT_VBIOS_CHECKSUM_OFFSET] =
+ acpi_checksum(header->VbiosContent, header->ImageLength);
+ }
+
current += header->ImageLength;
return current;
}