Hello Andrew,
Does this fail for all addresses? What address are you using when it
fails. You might want to try a DWORD access instead of a byte.
Virtualbox might be picky about the register size while real systems
might not care.
Stephen
Andrew Peters wrote:
> Hello List,
>
>
> I have been trying to test my EFI application on various systems and so
> far it works everywhere except the EFI implementation embedded in the
> VirtualBox (uefi 2.31 x64).
> The problem is related to the Mem.Read() function from EFI PCI IO
> PROTOCOL. In VirtualBox this function returns EFI_ERROR(2)
> (EFI_INVALID_PARAMETER).
> I have tried different parameters variations but it still returns same
> error even though it works 100% correctly on other systems. What is even
> more surprising
> the built-in "dmem" shell application (shell version 2.0) that uses this
> function by default works correctly in VirtualBox. Any ideas what is
> wrong? I'm attaching a sample code snippet:
>
> Note the Address and the Size arguments are 100% correct. Do you have
> any idea what can be wrong? Is there any other function to resolve this
> error?
>
> UINTN DisplayMmioMemory(
> IN CONST VOID *Address,
> IN CONST UINTN Size
> )
> {
> EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRbIo;
> EFI_STATUS Status;
> VOID *Buffer;
>
> Status = gBS->LocateProtocol(&gEfiPciRootBridgeIoProtocolGuid, NULL,
> (VOID**)&PciRbIo);
> if (EFI_ERROR(Status)) return 0;
>
> Buffer = AllocateZeroPool(Size);
> ASSERT(Buffer != NULL);
>
> // returns error
> Status = PciRbIo->Mem.Read(PciRbIo, EfiPciWidthUint8,
> (UINT64)(UINTN)Address, Size, Buffer);
> if (EFI_ERROR(Status)) {
> Print(L"Error: %d", Status);
> return 0;
> }
>
> Print(L"Everything ok!");
>
> FreePool(Buffer);
> return 1;
> }
>
>
> --
> Andrew
>
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> Everyone hates slow websites. So do we.
> Make your web apps faster with AppDynamics
> Download AppDynamics Lite for free today:
> http://p.sf.net/sfu/appdyn_d2d_jan
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_d2d_jan
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
