TRM_SCSI_XCNT
leftcnt += bus_space_read_4(iot, ioh, TRM_SCSI_XCNT);
leftcnt += bus_space_read_4(iot, ioh, TRM_SCSI_XCNT);
bus_space_write_4(iot, ioh, TRM_SCSI_XCNT, srb->buflen);
bus_space_write_4(iot, ioh, TRM_SCSI_XCNT,
bus_space_write_4(iot, ioh, TRM_SCSI_XCNT, 1);
bus_space_write_4(iot, ioh, TRM_SCSI_XCNT, 1);