Update PCI bus driver to support non-standard PCI to PCI bridge I/O window alignment, such as 2K/1K/512 byte. Feature PCD PcdPciBridgeIoAlignmentProbe is introduced to turn on/off this feature.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9598 6f19259b-4bc3-4df7-8a09-765794883524
2009-12-24 11:58:04 +00:00
parent 423401f9ea
commit 1ef2678316
7 changed files with 49 additions and 6 deletions
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
@@ -803,14 +803,12 @@ CreateResourceMap (
      //
      // If the device has children, create a bridge resource node for this PPB
      // Note: For PPB, memory aperture is aligned with 1MB and IO aperture
-      // is aligned with 4KB
-      // This device is typically a bridge device like PPB and P2C
-      // Note: 0x1000 aligned
+      // is aligned with 4KB (smaller alignments may be supported).
      //
      IoBridge = CreateResourceNode (
                   Temp,
                   0,
-                   0xFFF,
+                   Temp->BridgeIoAlignment,
                   PPB_IO_RANGE,
                   PciBarTypeIo16,
                   PciResUsageTypical