CDUART_FIFO
c = cduart_read(sc, CDUART_FIFO) & 0xff;
(void)cduart_read(sc, CDUART_FIFO);
cduart_write(sc, CDUART_FIFO, getc(&tp->t_outq));
c = bus_space_read_4(cduartconsiot, cduartconsioh, CDUART_FIFO);
bus_space_write_4(cduartconsiot, cduartconsioh, CDUART_FIFO, c);