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049463f8ad
We need a dummy read after enabling AHB peripheral clock before we can access the peripheral. For APB, we also need a dummy read for STM32F3. BRANCH=All affected BUG=chrome-os-partner:33007 TEST=make buildall Change-Id: I47f4a024dca294f555428c3f2053c1d32835ebe0 Signed-off-by: Vic Yang <victoryang@google.com> Reviewed-on: https://chromium-review.googlesource.com/246181 Reviewed-by: Alec Berg <alecaberg@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Tested-by: Vic Yang <victoryang@chromium.org> Commit-Queue: Vic Yang <victoryang@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit