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It's sometimes desirable to boot without a battery, but we may brown out if we don't have sufficient current. Inhibit AP power-on, even if the system is unprotected, until our charger and current limit are initialized. BUG=chrome-os-partner:41258 TEST=Manual on reworked glados with subsequent commit. Remove battery and attach Zinger. Verify EC powers on and AP doesn't boot. Run `powerbtn`, verify that AP boots. Remove all power and attach battery, verify that EC powers on and AP boots. BRANCH=None Change-Id: Ifc3d16f8288a035854e9fd05812ce6de33170d6a Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/280563 Reviewed-by: Alec Berg <alecaberg@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit