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EC boot / hash computing can be a bottleneck for system boot time. Reduce this bottleneck by running our processor at 48 MHz through boot, until vboot hashing of RW completes. BUG=chrome-os-partner:49583 TEST=Boot chell, verify vboot hash completes within 1 sec of EC boot and 'cbmem' delta between 'vboot select&load kernel' and 'finished EC verification' is reduced to ~250 ms (which includes sysjump time). BRANCH=glados Change-Id: I18d87e685b89decef761e51517bfcfc43dcf8ef0 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/326792 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> 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 For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly