On Thu, Jan 12, 2023 at 2:19 PM Loic Poulain loic.poulain@linaro.org wrote:
The u-boot console may show some corrupted characters when printing in board_init() due to reset or baudrate change of the UART (probe) before the TX FIFO has been completely drained.
To fix this issue, and in case UART is still running, we now try to flush the FIFO before proceeding to UART reinitialization. For this we're waiting for Transmitter Complete bit, indicating that the FIFO and the shift register are empty.
flushing has a 4ms timeout guard, which is normally more than enough to consume the FIFO @ low baudrate (9600bps).
Signed-off-by: Loic Poulain loic.poulain@linaro.org Tested-by: Lothar Waßmann LW@KARO-electronics.de
Reviewed-by: Fabio Estevam festevam@denx.de