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Some hardware has an issue where the reset flags are lost on power cycle because the EC backup ram loses power. This causes the flag to not power on the AP (ap-off) to be lost. In order to pass FAFT it is required that boards support this flag, so this commit adds a workaround where the skylake chipset code will call into the board to ask if it has working reset flags and if not it will skip the PMIC reset if the "ap-off" flag has been set. The "ap-off" flag is purely for testing, it is not possible for users to do this without having access to the EC console. (which is currently not possible at all with CCD unless you can also build a debug cr50 image) BUG=b:38187362,b:35585876 BRANCH=none TEST=manual testing on Eve: execute 'reboot ap-off' and ensure that the AP does not power on. Also ensure that 'dut-control power_state:rec' works as expected and does not power off at the recovery screen due to a power button press. Change-Id: If11e17179e9173509b9a6ae1ef0d94a50ba181d0 Signed-off-by: Duncan Laurie <dlaurie@google.com> Reviewed-on: https://chromium-review.googlesource.com/514503 Reviewed-by: Furquan Shaikh <furquan@chromium.org> Reviewed-by: Nicolas Boichat <drinkcat@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