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Use the power and servo connection states to enable and disable the EC and AP UART output. Contention between the cr50 and servo can prevent either uart from working, and possibly damage kevin or servo. If both UARTs are enabled, then cr50 cant know if servo is connected, so it is best if the UARTs are disabled before connecting servo. If servo is connected or if a device is not powered on then the UART output wont be enabled. The two UARTs are enabled separately and one can be enabled without the other. Any disabled UART will be monitored for a servo connection. If servo is detected, then all UARTs will be disabled. BUG=chrome-os-partner:52056,chrome-os-partner:52322 BRANCH=none TEST=manual Power on the EC only. Check only the EC UART is enabled. Without disabling the uarts power on the AP and verify both are now enabled. Turn of the AP. run 'uart enable. Verify only the EC UART is enabled. Then attach servo and check that the AP and EC UART are disabled. Change-Id: Ife27c9360e91b07f86ff8bfcec7f4fd423c31d25 Signed-off-by: Mary Ruthven <mruthven@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/342828
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