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Create new custom VDM to notify DUT to enter case closed debugging mode. Send this VDM from Plankton when the case closed debugging enable button is pressed. Once DUT receives the CCD enable VDM, CCD remains enabled until a reboot. Note, this is polarity dependent, so cable might need to be flipped. BUG=chrome-os-partner:42569 BRANCH=smaug TEST=load on plankton and ryu. attach full feature C to C cable (must have USB3.0 wires). make sure plankton is in USB mode (USB_SS_USB_MODE light should be set, which can be done by pressing DP_USB_TOGGLE button). Press CASE_CLOSE_EN button to send VDM, and then attach micro-B to debug port CN14 on plankton. See that VID/PID for Ryu show up in lsusb on host, and EC console works. If device does not show up, flip polarity of cable. Change-Id: Ifa469e4a43e32089becd75fe6cdfe0ed462d950b Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/287441 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit