In your code, there are several problems.
1. For your case, you couldn't simply locate all BlockIo instances. It's
because some of these BlockIo instances may belong to other removable devices,
some may point to physical partition rather than logical partition.
2. The logic below is incorrect. It means TRUE
if(!BlkIo->Media->RemovableMedia || BlkIo->Media->RemovableMedia)
3. Why don't you directly locate all SimpleFileSystem protocol instances and
then find out Hello.efi? It's more simple.
4. The hang you found should be due to a wrong device path pass down to
LoadImage().
Thanks
Feng
-----Original Message-----
From: edk2-devel [mailto:[email protected]] On Behalf Of Saqib
Khan
Sent: Thursday, September 29, 2016 7:41 PM
To: [email protected]
Subject: [edk2] stuck on LoadImage while loading image from usb
Hi ,
I am trying to load an EFI from another EFI, it stuck when LoadImage is called
both EFI are located on USB .
Here is code snippet
"
UINTN NumberFileSystemHandles;
EFI_HANDLE *FileSystemHandles;
UINTN Index;
EFI_BLOCK_IO* BlkIo;
EFI_DEVICE_PATH_PROTOCOL *FilePath;
EFI_HANDLE NewHandle;
UINTN ExitDataSizePtr;
EFI_BOOT_LOGO_PROTOCOL *BootLogo;
EFI_STATUS Status;
gBS->LocateHandleBuffer(ByProtocol,
&gEfiBlockIoProtocolGuid,
NULL,
&NumberFileSystemHandles,
&FileSystemHandles);
for(Index = 0; Index<NumberFileSystemHandles; ++Index) {
Status = gBS -> HandleProtocol(FileSystemHandles[Index],
&gEfiBlockIoProtocolGuid,
(VOID**) &BlkIo);
Print(L"after HandleProtocol %x - %r\n",FileSystemHandles[Index],
Status);
if(!EFI_ERROR(Status)) {
//check if it is usb
if(!BlkIo->Media->RemovableMedia ||
BlkIo->Media->RemovableMedia)
{
FilePath = FileDevicePath(FileSystemHandles[Index],
L"Hello.efi");
Status = gBS->LoadImage(
FALSE,
gImageHandle,
FilePath,
NULL,
0,
&NewHandle);
if (EFI_ERROR(Status)) {
if (NewHandle != NULL) {
gBS->UnloadImage(NewHandle);
}
//return (Status);
}
}
"
can any one help me what I am doing wrong here?
--
Regards
Saqib
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