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aad897775a
At 48Mhz, due to the flash accessing requiring 1 Wait-State, we need to enable the flash prefetch buffer to get the full CPU execution speed. The bit used to enable flash prefetching was fixed : crosreview.com/219921 , but the change was overriden by the CL enabling the STOP mode : crosreview.com/219933 Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=samus BUG=chrome-os-partner:28335 TEST=plug Zinger into a PD power sink, with the Twinkie protocol analyzer observe how long Zinger takes to send back GoodCRC after the Request and SinkCap messages. With the patch, the average delay is going from 160us to 50us. Change-Id: I9de1bc10e14485919046c841eea16de3c3b3c800 Reviewed-on: https://chromium-review.googlesource.com/229671 Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Alec Berg <alecaberg@chromium.org> Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit