[PATCH 0/3] qemu: allow auto-booting through firmware device

[Andre Przywara]

Hi,

when running QEMU and specifying both a firmware binary (--bios) and
a kernel (-kernel) on the command line, QEMU will run the firmware, but
will also record information about the provided kernel in the QEMU
firmware device. U-Boot's "qfw" command can load the kernel to a
provided address then. However using a kernel (and initrd) provided this
way requires typing some rather generic commands.

This series automates this, so that the default boot sequence tries to
launch a kernel this way first. If that fails, we gracefully continue
with the existing boot locations.

This simplifies automated booting, with external firmware:
$ qemu-system-aarch64 -machine virt,virtualization=on,gic-version=2
  -cpu cortex-a57 -nographic -display none -d unimp --bios u-boot.bin
  -kernel Image -initrd initrd.gz -append "earlycon"

The first two patches clean up some qfw issues, so that the automatic
booting becomes smoother, while the third patch adds the new commands
to QEMU's distro_boot script.

Please have a look!

Cheers,
Andre

Andre Przywara (3):
  qfw: store loaded file size in environment variable
  qfw: return failure when no kernel could be loaded
  qemu: Try to automatically boot from the QEMU firmware device (qfw)

 cmd/qfw.c                  |  6 ++++--
 include/configs/qemu-arm.h | 12 ++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

-- 
2.25.1