%C - Serial driver for PL011 UARTs

%C [options] [port[,irq]] &
%C specific options:
 -t number    Set receive FIFO trigger level ( 0 - 3; default 2 (1 / 2 full))
 -T number    Set number of characters to send to transmit FIFO
                                             ( 0 - 3; default 2 (1 / 2 full))
