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There are a couple of issues that cr50 has when it cannot know the state of servo, the EC, and the AP. This change adds support so we can detect when the AP or EC has been powered on and when servo has been connected. It uses the UART RX signals to monitor the power state of the AP and EC. The TX signals are used to monitor the state of servo. BUG=chrome-os-partner:52056,chrome-os-partner:52322 BRANCH=none TEST=verify device states are correct when the AP and EC are powered on or off and when Servo is attached or detached Change-Id: Id0a2281b65cb367ecc8d0ca2f9a576672318a5fb Signed-off-by: Mary Ruthven <mruthven@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/344019
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