diff options
Diffstat (limited to 'MdeModulePkg/MdeModulePkg.dec')
| -rw-r--r-- | MdeModulePkg/MdeModulePkg.dec | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index 8d90f169b2..270088c2e6 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -749,6 +749,18 @@ # @Prompt Turn on PS2 Mouse Extended Verification
gEfiMdeModulePkgTokenSpaceGuid.PcdPs2MouseExtendedVerification|TRUE|BOOLEAN|0x00010075
+[PcdsFeatureFlag.X64]
+ ## Indicates whether 64-bit PCI MMIO BARs should degrade to 32-bit in the presence of an option ROM
+ # On X64 platforms, Option ROMs may contain code that executes in the context of a legacy BIOS (CSM),
+ # which requires that all PCI MMIO BARs are located below 4 GB
+ # TRUE - All PCI MMIO BARs of a device will be located below 4 GB if it has an option ROM
+ # FALSE - PCI MMIO BARs of a device may be located above 4 GB even if it has an option ROM
+ # @Prompt Degrade 64-bit PCI MMIO BARs for legacy BIOS option ROMs
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciDegradeResourceForOptionRom|TRUE|BOOLEAN|0x0001003a
+
+[PcdsFeatureFlag.IA32, PcdsFeatureFlag.ARM, PcdsFeatureFlag.AARCH64]
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciDegradeResourceForOptionRom|FALSE|BOOLEAN|0x0001003a
+
[PcdsFeatureFlag.IA32, PcdsFeatureFlag.X64]
## Indicates if DxeIpl should switch to long mode to enter DXE phase.
# It is assumed that 64-bit DxeCore is built in firmware if it is true; otherwise 32-bit DxeCore
|