rockchip: add early uart driver
add early uart driver so we can print debug message in SPL stage Signed-off-by: NLin Huang <hl@rock-chips.com> Acked-by: NSimon Glass <sjg@chromium.org>
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add early uart driver so we can print debug message in SPL stage Signed-off-by: NLin Huang <hl@rock-chips.com> Acked-by: NSimon Glass <sjg@chromium.org>