vboot: Introduce alternate boot functionality
Introduce alternate boot functionality both via keyboard shortcut
("Ctrl+L") to directly boot into the default alternate bootloader,
and via menu ("Alternate bootloader" on dev screen) to show a screen
listing available bootloaders.
BUG=b:146399181, b:161092974
TEST=make clean && make runtests
BRANCH=puff, zork
Cq-Depend: chromium:2339040
Signed-off-by: Joel Kitching <kitching@google.com>
Change-Id: I28f157936017719dc95656db147967f5e61a1407
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2335017
Commit-Queue: Yu-Ping Wu <yupingso@chromium.org>
Tested-by: Hsuan Ting Chen <roccochen@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
7 files changed
