Hello
I try to make work a code from "UEFI Driver Writer Guide", but always receive
EFI_UNSUPPORTED status:
EFI_STATUS
EFIAPI
PciDriverOnlyDriverBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
EFI_STATUS Status;
EFI_PCI_IO_PROTOCOL *PciIo;
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiPciIoProtocolGuid,
(VOID **)&PciIo,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
DEBUG((EFI_D_INFO, "Status is %r \r\n", Status));
if (EFI_ERROR (Status)) {
return Status;
}
return EFI_SUCCESS;
}
However, for example, with EFI_SIMPLE_FILE_SYSTEM_PROTOCOL instead of
EFI_PCI_IO_PROTOCOL OpenProtocol() works fine and returns EFI_SUCCESS.
Driver project was created with UEFI Driver Wizard. Inf file contains
gEfiPciIoProtocolGuid.
Where I could make a mistake?
WBR,
John
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