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| author | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-11-09 03:41:03 +0000 |
|---|---|---|
| committer | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-11-09 03:41:03 +0000 |
| commit | aeeb84bab4d8743c3f432a93d913d38bef3f612e (patch) | |
| tree | 74d146044813c9c667c483a21449bf4e646a7315 /MdeModulePkg/MdeModulePkg.dec | |
| parent | 8835954602834c41db448064a7205ac0b8b66189 (diff) | |
| download | edk2-platforms-aeeb84bab4d8743c3f432a93d913d38bef3f612e.tar.xz | |
Some existing PCI adapters with UEFI option ROMs make unaligned requests through the PCI I/O Protocol. Add support for unaligned requests in the PCI IO protocol implementation in the PCI Bus driver to be compatible with those UEFI option ROMs.
This solution defines a PCD Feature Flag to enabled support for unaligned requests through the PCI I/O Protocol. This flag is disabled by default. Platforms that do want to support such EFI/UEFI drivers that make unaligned PCI I/O requests should enable this feature.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11016 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg/MdeModulePkg.dec')
| -rw-r--r-- | MdeModulePkg/MdeModulePkg.dec | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index e26ff142c8..aa805630c3 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -269,6 +269,11 @@ ## This PCD specified whether ACPI SDT protocol is installed.
gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|FALSE|BOOLEAN|0x0001004d
+ ## If TRUE, then unaligned I/O, MMIO, and PCI Configuration cycles through the PCI I/O Protocol are enabled.
+ # If FALSE, then unaligned I/O, MMIO, and PCI Configuration cycles through the PCI I/O Protocol are disabled.
+ # The default value for this PCD is to disable support for unaligned PCI I/O Protocol requests.
+ gEfiMdeModulePkgTokenSpaceGuid.PcdUnalignedPciIoEnable|FALSE|BOOLEAN|0x0001003e
+
[PcdsFeatureFlag.IA32, PcdsFeatureFlag.X64]
##
# This feature flag specifies whether DxeIpl switches to long mode to enter DXE phase.
|