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If a bios carries an EC image signed by a wrong key, EFS EC falls back to the previous slot upon reboot. Vboot currently does not handle this case and tries to update the EC with an incompatible image again. When this happens, a user sees 'applying critical update' screen repeatedly. This patch adds EFS_VERIFYV host command. Vboot on AP calls it to check whether the EC likes a newly updated image or not. If the verification fails, it's considered as update failure and vboot displays 'broken' screen. BUG=b:71719323 BRANCH=none TEST=Flash EC SPI with an image which has a different RO key. Boot DUT and let it run software sync. EC-RO rejects the updated image and falls back to the previous one. The update counter is incremented and vboot shows the 'broken' screen, requesting recovery. Change-Id: I8a107a376963baa146ff691c50d80018ec3e429c Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/858159 Reviewed-by: Randall Spangler <rspangler@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly