Hello,
I'm trinying to load a EFI\BOOT\Bootx64.efi-image from a specific partition
using the UEFI LoadImage() function.
But I think I have some difficulties to build a correct DevicePath to the
image.
Right now I do it the following way, but the LoadImage() function gets stuck
in a Deadloop:
struct {
EFI_DEVICE_PATH_PROTOCOL Header;
CHAR16 FileName[22];
EFI_DEVICE_PATH_PROTOCOL end;
} ApplicationFilePath = {
{
MEDIA_DEVICE_PATH,
MEDIA_FILEPATH_DP,
46
},
{ L"EFI\\BOOT\\BOOTx64.EFI"},
{
END_DEVICE_PATH, END_ENTIRE_SUBTYPE,
sizeof(EFI_DEVICE_PATH_PROTOCOL)
}
};
EFI_DEVICE_PATH_PROTOCOL *pApplicationFilePath = (EFI_DEVICE_PATH_PROTOCOL
*)&ApplicationFilePath;
// Get all BlockIO-Protocols
Status =
pBS->LocateHandleBuffer(ByProtocol,&gEfiBlockIoProtocolGuid,NULL,&Count,&Han
dle);
for( i=0; i<Count; i++ ){
EFI_BLOCK_IO_PROTOCOL *BlockIo;
EFI_DEVICE_PATH_PROTOCOL *PartitionDevicePath,
*TmpDevicePath;
EFI_DEVICE_PATH_PROTOCOL *pApplicationPath = NULL;
Status = pBS->HandleProtocol(Handle[i],
&gEfiDevicePathProtocolGuid, &PartitionDevicePath);
// Get last node of the device path. It should be partition
node
PartitionNode = (HARDDRIVE_DEVICE_PATH*)PartitionDevicePath;
for( TmpDevicePath = PartitionDevicePath;
!EfiIsDevicePathEndType(TmpDevicePath);
TmpDevicePath =
EfiNextDevicePathNode(TmpDevicePath) )
{
PartitionNode =
(HARDDRIVE_DEVICE_PATH*)TmpDevicePath;
}
// Here I'm looking for a specific partition and check some
Header-Parameter
if (PartitionNode->Header.Type != MEDIA_DEVICE_PATH ||
PartitionNode->Header.SubType !=
MEDIA_HARDDRIVE_DP ||
PartitionNode->SignatureType != 0x02 ||
MemCmp(&PartitionNode->Signature,
gGuidOfASpecificPartition, sizeof(EFI_GUID)) != 0)
continue;
Status =
pBS->LocateProtocol(&gEfiDevicePathUtilitiesProtocolGuid,
NULL,(VOID**)&pDevicePathUtils);
// Build the whole DevicePath
pApplicationPath =
pDevicePathUtils->AppendDevicePath(PartitionDevicePath,pApplicationFilePath)
;
// Try to load the Image using the built DevicePath
Status = pBS->LoadImage
(TRUE,ImageHandle,pApplicationPath,NULL,0,&Handle);
// But it resaults in a deadloop
}
I would appreciate any hints on what I'm missing.
Thank you,
Michael
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