1 files changed, 8 insertions, 0 deletions
diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 9b603f001f..aae1972950 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -395,6 +395,14 @@
   gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask|0x2F
 !endif
 
+  # This PCD is used to set the base address of the PCI express hierarchy. It
+  # is only consulted when OVMF runs on Q35. In that case it is programmed into
+  # the PCIEXBAR register.
+  #
+  # On Q35 machine types that QEMU intends to support in the long term, QEMU
+  # never lets the RAM below 4 GB exceed 2 GB.
+  gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0x80000000
+
 !ifdef $(SOURCE_DEBUG_ENABLE)
   gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdDebugLoadImageMethod|0x2
 !endif