io range is not mandatory according to pcie spec, so allow
pcie host bridge configurations without io window in case
there are no io reservations.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
Reviewed-by: Ard Biesheuvel <a...@kernel.org>
---
MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
b/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
index b20bcd310ad5..354be6dbb313 100644
--- a/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
+++ b/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
@@ -1085,6 +1085,12 @@ NotifyPhase (
RootBridge->ResAllocNode[Index].Base = BaseAddress;
RootBridge->ResAllocNode[Index].Status = ResAllocated;
DEBUG ((DEBUG_INFO, "Success\n"));
+ } else if ((Index == TypeIo) &&
+ (RootBridge->Io.Base == MAX_UINT64) &&
+ (RootBridge->ResAllocNode[Index].Length == 0))
+ {
+ /* I/O is optional on PCIe */
+ DEBUG ((DEBUG_INFO, "Success (PCIe NoIO)\n"));
} else {
ReturnStatus = EFI_OUT_OF_RESOURCES;
DEBUG ((DEBUG_ERROR, "Out Of Resource!\n"));
--
2.36.1
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