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Simple control of SPI for flashing over USB. This driver is working, and using the discovery board with a W25Q16 flash chip attached flashrom can read, erase, write, and verify the whole chip in 45 seconds. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Change-Id: I224f1f87cd6adc8b64c17de1df98dae0a9cfa6a5 Reviewed-on: https://chromium-review.googlesource.com/218740 Reviewed-by: Anton Staaf <robotboy@chromium.org> Tested-by: Anton Staaf <robotboy@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org>