On 02/26/13 06:22, satish kondapalli wrote:
> Hi,
>
> I developed option ROM Driver for my PCIe device. Driver is working fine
> on Intel servers. But on Dell R720 server, I am not able to access my
> BAR registers but i am able to access device config space.
>
> In Driver supported function, verified the Device ID,Vendor ID and
> returned EFI_SUCCESS. In my start function I enabled my pcie device with
> following API.
>
> Status = PciIo->Attributes(
> PciIo,
> EfiPciIoAttributeOperationEnable,
> EFI_PCI_DEVICE_ENABLE,
> NULL
> );
> After enabling my device, i accessed one register(at x offset) in my bar
> space with following API.
>
> Status = PciIo->Mem.Read(
> PciIo,
> EfiPciIoWidthUint64,
> 0,
> x,
> 1,
> &TmpAddr);
> if(EFI_ERROR(Status)) {
> Print(L"BAR READ Failed: status:%d\n",Status);
> }
>
> Above API giving error with status value as 2. But same code is working
> fine in Intel servers.
Try two 32-bit reads instead.
13.4 EFI PCI I/O Protocol
EFI_PCI_IO_PROTOCOL.Mem.Read()
[...] The caller is responsible for any alignment and I/O width
issues which the bus, device, platform, or type of I/O might
require. For example on some platforms, width requests of
EfiPciIoWidthUint64 do not work.
Laszlo
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