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When a new upgrade block starts, the host sends first a 12 byte message including the block size and header. The target must verify that the message is of the proper size and the contents make sense (the header is not all zeros). It also should drain the USB queue completely in case it holds a message of a different size. BRANCH=none BUG=chrome-os-partner:52856 TEST=upgrade still works fine on B1 Change-Id: I80538a3a1a5d507a84bd21b868a3db626bc6a4b0 Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/341619 Reviewed-by: Mary Ruthven <mruthven@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