ALC_CMB_SZ
error = bus_dmamap_create(sc->sc_dmat, ALC_CMB_SZ, 1,
ALC_CMB_SZ, 0, BUS_DMA_NOWAIT,
error = bus_dmamem_alloc(sc->sc_dmat, ALC_CMB_SZ,
nsegs, ALC_CMB_SZ, (caddr_t *)&sc->alc_rdata.alc_cmb,
sc->alc_rdata.alc_cmb, ALC_CMB_SZ, NULL,
bzero(rd->alc_cmb, ALC_CMB_SZ);