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x86 systems will auto-power-on when power is applied to the EC. When the battery level is critically low, power-on is prevented, except when the system is unlocked. So, when unlocked, some systems will auto-power-on regardless of battery level, overcurrent the charger / battery, and then repeat forever. Prevent this reboot loop by ignoring auto-power-up when the battery is critically low, regardless of system unlocked status. BUG=chrome-os-partner:48339 TEST=Verify power-up is prevented on no-battery chell w/ donette. Then, run 'powerbtn' on EC console and verify system powers on (and overcurrents). BRANCH=None Change-Id: Ia631b5a8c45b42ec805e4a0c3f827929a0efd236 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/319187 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Duncan Laurie <dlaurie@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