Hi,
I am trying to boot linux from SD card.
I have made below changes in my dsc file:
gArmPlatformTokenSpaceGuid.PcdDefaultBootDescription|L"Linux from SD"
gArmPlatformTokenSpaceGuid.PcdDefaultBootDevicePath|L"VenHw(B6F43CC0-9E45-11DF-BE21-0002A5D5C51B)/HD(1,MBR,0x6D6D636F,0x3F,0x115F16B)/kernel.itb"
gArmPlatformTokenSpaceGuid.PcdDefaultBootType|3
gArmPlatformTokenSpaceGuid.PcdPlatformBootTimeOut|10
Here B6F43CC0-9E45-11DF-BE21-0002A5D5C51B is Guid of my SD driver.
My driver's device path is:
gDevicePath = {
{
{ HARDWARE_DEVICE_PATH, HW_VENDOR_DP, { (UINT8)sizeof(VENDOR_DEVICE_PATH),
(UINT8)((sizeof(VENDOR_DEVICE_PATH)) >> 8) } },
EFI_CALLER_ID_GUID
},
{ END_DEVICE_PATH_TYPE, END_ENTIRE_DEVICE_PATH_SUBTYPE,
{ sizeof (EFI_DEVICE_PATH_PROTOCOL), 0}
}
};
Here VenHw has Type as 1 and subtype as 4 in device path whereas HD has Type as
4 and subtype as 1 as device path.
I am registering Type as 1 and subtype as 4 in my driver's device path, is this
correct?
In BdsLoadImage() function check is on Type 4 and subtype 1 in BdsGetDeviceHd()
function, which is failing in my case.
Also in BdsConnectAndUpdateDevicePath(),
do {
Remaining = *DevicePath;
// The LocateDevicePath() function locates all devices on DevicePath that
support Protocol and returns
// the handle to the device that is closest to DevicePath. On output, the
device path pointer is modified
// to point to the remaining part of the device path
Status = gBS->LocateDevicePath (&gEfiDevicePathProtocolGuid, &Remaining,
Handle);
if (!EFI_ERROR (Status)) {
if (*Handle == PreviousHandle) {
//
// If no forward progress is made try invoking the Dispatcher.
// A new FV may have been added to the system and new drivers
// may now be found.
// Status == EFI_SUCCESS means a driver was dispatched
// Status == EFI_NOT_FOUND means no new drivers were dispatched
//
Status = gDS->Dispatch ();
}
if (!EFI_ERROR (Status)) {
PreviousHandle = *Handle;
// Recursive = FALSE: We do not want to start the whole device tree
Status = gBS->ConnectController (*Handle, NULL, Remaining, FALSE);
}
}
} while (!EFI_ERROR (Status) && !IsDevicePathEnd (Remaining));
In every loop we are using same value in Remaining (Remaining = *DevicePath),
means it will exist only when there is an error in Status because
IsDevicePathEnd (Remaining) will never be true.
Then what is the use of this check?
Kindly help.
Thanks & regards
Meenakshi Aggarwal
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