ALC_CMB_SZ
cmb_end = sc->alc_rdata.alc_cmb_paddr + ALC_CMB_SZ;
ALC_CMB_SZ, /* maxsize */
ALC_CMB_SZ, /* maxsegsize */
ALC_CMB_SZ, alc_dmamap_cb, &ctx, 0);
bzero(rd->alc_cmb, ALC_CMB_SZ);