sravan/system76-edk2
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Update resource degrade algorithm in PCI bus driver. (1)If any child device has both option ROM and 64-bit BAR, degrade its PMEM64/MEM64 requests in case that if a legacy option ROM image can not access 64-bit resources. (2) If there are both PMEM64 and PMEM32 requests from child devices, which can not be satisfied by a P2P bridge simultaneously, keep PMEM64 and degrade PMEM32 to MEM32. (3) PMEM64/MEM64 are not supported when firmware is in 32-bit mode.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9599 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
rsun3
2009-12-24 14:05:36 +00:00
parent 1ef2678316
commit 6051620257
2 changed files with 70 additions and 29 deletions
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MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
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@@ -475,6 +475,7 @@ DetermineRootBridgeAttributes (
}
if ((Attributes & EFI_PCI_HOST_BRIDGE_MEM64_DECODE) != 0) {
RootBridgeDev->Decodes |= EFI_BRIDGE_MEM64_DECODE_SUPPORTED;
RootBridgeDev->Decodes |= EFI_BRIDGE_PMEM64_DECODE_SUPPORTED;
}