>>> pruss.uart.io.close()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/debian/py-uio/src/uio/ti/icss/uart.py", line 282, in close
    super().close()
  File "/home/debian/py-uio/src/uio/ti/icss/uart.py", line 323, in flush
    self._poll( lambda: self._tx_done, discard=discard )
  File "/home/debian/py-uio/src/uio/ti/icss/uart.py", line 314, in _poll
    raise RuntimeError( "Receive FIFO overrun" )
RuntimeError: Receive FIFO overrun