SBP_DEV2ADDR
ocb->orb[7] = htonl(SBP_DEV2ADDR(dv_unit, sdev->lun_id));
sc->sc_fwb.start = SBP_DEV2ADDR(dv_unit, 0);
sc->sc_fwb.end = SBP_DEV2ADDR(dv_unit, -1);