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AP and EC UART now use the CCD V1 capabilities to determine when access is allowed. Transmit to AP and EC can be toggled independently from read access to output from those UARTs. Note that disabling read access disables both transmit and receive. That is, it's not possible to set a UART where transmit is allowed but receive isn't. Why would you want to do that, anyway? See go/cr50-ccd-wp for more information. BUG=b:62537474 BRANCH=cr50 TEST=manual with CR50_DEV=1 ccdoops ccdset cr50fullconsole always -> so we can use ccd command for testing ccd -> AP RX+TX, EC RX+TX ccdset uartecrx unlesslocked ccdset uartectx ifopened ccdset uartaprx always ccdset uartaptx unlesslocked ccdunlock ccd -> AP RX+TX, EC RX ccdlock ccd -> AP RX, EC disabled ccdoops ccdset cr50fullconsole always ccd -> AP RX+TX, EC RX+TX ccdset uartaprx ifopened ccdlock ccd -> AP disabled, EC RX Change-Id: I55db5897bb52cd60658ab221eadf5c59fc86744a Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/595196 Reviewed-by: Aseda Aboagye <aaboagye@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