UART_FR
fr = bus_space_read_4(sc->sc_iot, sc->sc_ioh, UART_FR);
while (!ISSET(bus_space_read_4(iot, ioh, UART_FR), UART_FR_RXFE)) {
fr = bus_space_read_4(iot, ioh, UART_FR);
while ((bus_space_read_4(pluartconsiot, pluartconsioh, UART_FR) &
while ((bus_space_read_4(pluartconsiot, pluartconsioh, UART_FR) &