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efi: Add video support to the app

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The current EFI video driver only works when running in the stub. In that
case the stub calls boot services (before jumping to U-Boot proper) and
copies the graphics info over to the efi table. This is necessary because
the stub exits boot services before jumping to U-Boot.

The app maintains access to boot services throughout its life, so does not
need to do this. Update the driver to support calling boot services
directly.

Enable video output for the app. Note that this uses the
EFI_GRAPHICS_OUTPUT_PROTOCOL protocol, even though it mentions vesa.

A sample qemu command-line for this case is:

   qemu-system-x86_64 -bios /usr/share/edk2.git/ovmf-ia32/OVMF-pure-efi.fd
   -drive id=disk,file=try.img,if=none,format=raw -nic none
   -device ahci,id=ahci -device ide-hd,drive=disk,bus=ahci.0

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Simon Glass
2021-11-03 21:09:10 -06:00
committed by Heinrich Schuchardt
parent f844573762
commit 1834c081d3
6 changed files with 50 additions and 13 deletions
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2
doc/develop/uefi/u-boot_on_efi.rst
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@@ -265,7 +265,7 @@ This work could be extended in a number of ways:
- Figure out how to solve the interrupt problem
- Add more drivers to the application side (e.g. video, block devices, USB,
- Add more drivers to the application side (e.g. block devices, USB,
environment access). This would mostly be an academic exercise as a strong
use case is not readily apparent, but it might be fun.