DO_CLRATN
TRM_S1040_SCSI_CONTROL, DO_CLRATN);
bus_space_write_2(iot, ioh, TRM_S1040_SCSI_CONTROL, DO_CLRATN);
bus_space_write_2(iot, ioh, TRM_S1040_SCSI_CONTROL, DO_CLRATN | DO_CLRFIFO);