Flag_TXFF
if (!ISSET(flagr, Flag_TXFF) && sc->sc_tbc > 0) {
while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) == 0) {
while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) != 0)
while(ISSET(EPCOM_READ(Flag), Flag_TXFF));