Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: c70637de12e0d5cee78ebf5a0b5d09cdb1db53c9
https://github.com/tianocore/edk2/commit/c70637de12e0d5cee78ebf5a0b5d09cdb1db53c9
Author: Phil Noh <[email protected]>
Date: 2026-07-17 (Fri, 17 Jul 2026)
Changed paths:
M MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
Log Message:
-----------
MdeModulePkg/PciBusDxe: Honor SpecificFlag for PMem64 in UpdatePciInfo
When UpdatePciInfo() downgrades a PciBarTypePMem64 BAR to a 32-bit type
via EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL, it unconditionally
assigns PciBarTypePMem32 regardless of SpecificFlag, placing the BAR in
the prefetchable bridge window even when the platform intended the
non-prefetchable window.
The ACPI resource descriptor's SpecificFlag field encodes the intended
prefetchability of the constrained resource, using the bit:
EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE.
Fix this by checking the bit in SpecificFlag to select PciBarTypePMem32 or
PciBarTypeMem32, consistent with DumpPpbPaddingResource() in
PciEnumeratorSupport.c that uses the bit as the sole discriminator
between the two 32-bit BAR types.
Signed-off-by: Phil Noh <[email protected]>
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