+ ## Indicates whether 64-bit PCI MMIO BARs should degrade to 32-bit in the presence of an option ROM\r
+ # On X64 platforms, Option ROMs may contain code that executes in the context of a legacy BIOS (CSM),\r
+ # which requires that all PCI MMIO BARs are located below 4 GB\r
+ # TRUE - All PCI MMIO BARs of a device will be located below 4 GB if it has an option ROM\r
+ # FALSE - PCI MMIO BARs of a device may be located above 4 GB even if it has an option ROM\r
+ # @Prompt Degrade 64-bit PCI MMIO BARs for legacy BIOS option ROMs\r
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciDegradeResourceForOptionRom|TRUE|BOOLEAN|0x0001003a\r
+\r
+[PcdsFeatureFlag.IA32, PcdsFeatureFlag.ARM, PcdsFeatureFlag.AARCH64]\r
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciDegradeResourceForOptionRom|FALSE|BOOLEAN|0x0001003a\r
+\r