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f74131134c
If data is pushed over serial/JTAG too fast we may fill up stdin_ringbuf and not be able to read all the data out of the serial/JTAG buffer. Thus we need to explicitly poll and read the serial/JTAG RX buffer to prevent blocking (since if the serial/JTAG buffer is already filled, we will not get another interrupt to transfer it to the stdin ringbuffer). Signed-off-by: Daniël van de Giessen <daniel@dvdgiessen.nl>