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To enable device mode, set the gpio USB2_OTG_ID in the respective boards to high. Pull the gpio low to disable device mode. BUG=b:79343083 BRANCH=NONE TEST=On Yorp board, for UFP mode gpio USB2_OTG_ID should be high, for DFP mode gpio USB2_OTG_ID should be low. In OS console, lspci should list xdci. (with chromiumos/third_party/coreboot/+/1064592) Change-Id: I70f13a9705626d9bcbe989239f6826d35d8fa536 Signed-off-by: Jagadish Krishnamoorthy <jagadish.krishnamoorthy@intel.com> Reviewed-on: https://chromium-review.googlesource.com/1058832 Reviewed-by: Jett Rink <jettrink@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