IG4_INTR_STOP_DET
if (intr & (IG4_INTR_TX_EMPTY | IG4_INTR_STOP_DET)) {
(IG4_INTR_START_DET | IG4_INTR_STOP_DET)) == IG4_INTR_START_DET);
error = wait_intr(sc, IG4_INTR_STOP_DET);
error = wait_intr(sc, IG4_INTR_STOP_DET);