IXPCOM_SR
sr = bus_space_read_4(iot, ioh, IXPCOM_SR);
sr = bus_space_read_4(iot, ioh, IXPCOM_SR);
sr = bus_space_read_4(iot, ioh, IXPCOM_SR);
while (bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXR) {
while (ISSET(bus_space_read_4(iot, ioh, IXPCOM_SR), SR_RXR)
while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXR))
while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXE))
while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_RXR))