serial: pl011: Resend the character if FIFO is full in debug uart
pl01x_putc() might return -EAGAIN if there was no space in FIFO. In that case, high-level caller should wait until there is space and resend the character. Signed-off-by: NChen Baozi <chenbaozi@phytium.com.cn> Reviewed-by: NStefan Roese <sr@denx.de> Reviewed-by: NSimon Glass <sjg@chromium.org>
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