[edk2-devel] [PATCH] MdeModulePkg/Bus/Pci/PciBusDxe: Increase the width of the data read during oprom shadow

Sumana Venur sumana.venur at intel.com
Fri Jun 11 16:37:44 UTC 2021

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2989

Long times spent on shadowing oprom from graphics card to system memory. We are currently using 8 bit read cycles.
This needs to be wider, at least 32bit reads to reduce the time for oprom shadow

Signed-off-by: Sumana Venur <sumana.venur at intel.com>
 MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
index c994ed5fe3..a981f93f43 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
@@ -521,9 +521,9 @@ LoadOpRomImage (
     PciDevice->PciRootBridgeIo->Mem.Read (
-                                      EfiPciWidthUint8,
+                                      EfiPciWidthUint32,
-                                      (UINT32) RomImageSize,
+                                      (UINT32) RomImageSize/sizeof(UINT32),
     RomInMemory = Image;

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