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UART Driver API
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16x50 UART Driver
uart_update_timeout --  update per-port FIFO timeout.
uart_get_baud_rate --  return baud rate for a particular port
uart_get_divisor --  return uart clock divisor
uart_register_driver --  register a driver with the uart core layer
uart_unregister_driver --  remove a driver from the uart core layer
uart_add_one_port --  attach a driver-defined port structure
uart_remove_one_port --  detach a driver defined port structure
uart_register_port -- 
uart_unregister_port --  de-allocate a port
register_serial --  configure a 16x50 serial port at runtime
unregister_serial --  remove a 16x50 serial port at runtime
serial8250_suspend_port --  suspend one serial port
serial8250_resume_port --  resume one serial port