tree cb32087a1f81993c38e03fe7ed14f0469738791a
parent 7f6176dc5502dc4d6b166ab2c7c90209220e82ff
author Nicolas Boichat <drinkcat@google.com> 1492051982 +0800
committer chrome-bot <chrome-bot@chromium.org> 1493206087 -0700

rwsig: protect all flash before jumping to RW

On "normal" EC, we do protect RW as part of software sync, which would
call flash_command_protect (which indirectly calls flash_protect_at_boot).

Here, we don't want to (and can't) rely on the host to tell us to protect
the RW, so we need to protect it ourselves before jumping to RW.

This does feel a little redundant with rollback_lock though, since ALL
will protect both RW and ROLLBACK: a later CL will fix that up.

BRANCH=none
BUG=b:35587171
TEST=flashwp true; reboot; RO protects all flash before booting to RW

Change-Id: I820cabb01d1ca4aa47b81fc013a1670134a6be09
Reviewed-on: https://chromium-review.googlesource.com/476453
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>