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 <Phil.Noh@amd.com>

0 files changed, 0 insertions, 0 deletions