IMXUART_USR2
if(!ISSET(bus_space_read_2(iot, ioh, IMXUART_USR2), IMXUART_SR2_RDR))
while(ISSET(bus_space_read_2(iot, ioh, IMXUART_USR2), IMXUART_SR2_RDR)) {
while((bus_space_read_2(imxuartconsiot, imxuartconsioh, IMXUART_USR2) &
while((bus_space_read_2(imxuartconsiot, imxuartconsioh, IMXUART_USR2) &