(Optionally) split rwsig verification into a separate task. This
allows us to initialize other components (e.g. USB) while the
verification is in progress, speeding up the boot process to active
USB in RO case.
After CONFIG_RWSIG_JUMP_TIMEOUT, the EC will jump to the RW section
if no action is taken by the AP (such as a forced request to jump
to RW, or starting an update).
Note: This comes with a ~36ms boot time regression, as other code
gets to run before verification starts.
BRANCH=none
BUG=b:35587171
TEST=Flash, board boots to RW after 1s
TEST=Change jump timeout to 5s, add 5s delay in check_signature,
add console command to manually abort/continue rwsig verification.
'rwsig continue' works => Board jumps to RW after check_signature
is completed (or immediately while waiting for timeout)
'rwsig abort' works => Board does not jump to RW.
Change-Id: Ica5732b9298bb4d3b743cae2ba78df259db915ef
Reviewed-on: https://chromium-review.googlesource.com/468709
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
68a537e466