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This DMA receiver uses a separate small circular buffer to DMA into. This allows the DMA transaction to be made circular, and thus it does not require the interrupt latency to be low enough to setup the next transfer before the next character comes in. Additional diagnostics output have been added to the usart_info console command to facilitate tuning of the FIFO size. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Verify DMA works by cross connecting two discovery boards Change-Id: Idcdf95a47fadf21ec2154f0c9128cd3586e568ec Reviewed-on: https://chromium-review.googlesource.com/292870 Tested-by: Anton Staaf <robotboy@chromium.org> Reviewed-by: Anton Staaf <robotboy@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org> Trybot-Ready: Anton Staaf <robotboy@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit