[Qemu-devel] [Bug 1223477] Re: Unable to read USB filesystems with EFI Bios

[Thomas Huth]

Triaging old bug tickets... can you still reproduce this issue with the
latest version of QEMU? Or could we close this ticket nowadays?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1223477

Title:
  Unable to read USB filesystems with EFI Bios

Status in QEMU:
  Incomplete

Bug description:
  Preamble and version:
  With respect to my fix for using USB devices as -hda mentioned in bug 1223467
  Using Qemu 1.6.0 with OVMF r11337-alpha (Qemu is built from Source, OVMF is 
pre built)

  Command:
  qemu-system-i386.exe -m 1024 -hda \\.\PhysicalDrive1 -L ovmf-ia32

  Fault:
  The EFI Shell is able to detect the hda block device, report its capacity and 
usage; 
  but it sees no files or directories on the device.

  Similar commands:
  I have also seen the same with 
  qemu-system-x86_64.exe -m 1024 -hda \\.\PhysicalDrive1 -L ovmf-ia32
  and
  qemu-system-x86_64.exe -m 1024 -hda \\.\PhysicalDrive1 -L ovmf-x64

  Investigations:
  I tried very small (500MB) and very large (32 GB) USB devices with no 
difference.
  I re-built several versions of Qemu in an identical build environment, and 
found that: 
  Qemu 1.2.2 and before, all the above commands work and the EFI boot loader is 
called.
  Qemu 1.3.0-rc0 and after do not work and the USB device appears blank.
  I'm reporting the bug here and not with OVMF because older versions of Qemu 
with the same OVMF bios work perfectly. 

  In all cases using '-L pc-bios' works perfectly.
  In all cases using an image of the USB device works.

  Thanks

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