OvmfPkg: PlatformPei: enable PCIEXBAR (aka MMCONFIG / ECAM) on Q35

[mirror_edk2.git] / OvmfPkg / OvmfPkgX64.dsc

diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index b971ee8bb56b2f6c61a44844bd7490c1d156b734..18517e337649474be89ff98665e3c54f8efa83e5 100644 (file)
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -400,6 +400,14 @@
   gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask|0x2F\r
 !endif\r
 \r
+  # This PCD is used to set the base address of the PCI express hierarchy. It\r
+  # is only consulted when OVMF runs on Q35. In that case it is programmed into\r
+  # the PCIEXBAR register.\r
+  #\r
+  # On Q35 machine types that QEMU intends to support in the long term, QEMU\r
+  # never lets the RAM below 4 GB exceed 2 GB.\r
+  gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0x80000000\r
+\r
 !ifdef $(SOURCE_DEBUG_ENABLE)\r
   gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdDebugLoadImageMethod|0x2\r
 !endif\r