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This adds support for the "sleep" low-power mode. It consumes less power than simply waiting, but doesn't require a full warm boot to resume. BUG=chrome-os-partner:49955 BRANCH=none TEST=make buildall; test on Cr50 Configure the Cr50 to sleep when idle (refer to previous commit messages for the setup required). On the console, use the "idle" command to test the three different modes: idle w - wfi, wakes instantly idle s - sleep, wakes slowly but without rebooting idle d - deep sleep, wakes via warm boot You can tell the difference between wfi and sleep by observing that the first character is lost when typing on the serial console while in sleep (remember that it will wait at least 10 seconds after the last console input before sleeping). Signed-off-by: Bill Richardson <wfrichar@chromium.org> Change-Id: Ib2584aa44ab885f0c8369ec938ee17b935aa0898 Reviewed-on: https://chromium-review.googlesource.com/336836 Reviewed-by: Dominic Rizzo <domrizzo@google.com>
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