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This is a precursor to DMA-based UART transfers, which require different processing for DMA vs PIO output types. BUG=chrome-os-partner:20485 BRANCH=pit TEST=Boot pit; verify EC console still works. Change-Id: I6d6f55561eeebe9bd2928b2bfb25278c86f689d1 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/168811 Reviewed-by: Bill Richardson <wfrichar@chromium.org>