CS4280_ICHUNK
return (blk < CS4280_ICHUNK ? CS4280_ICHUNK : blk & -CS4280_ICHUNK);
sc->sc_pcount = blksize / CS4280_ICHUNK; /* CS4280_ICHUNK is fixed hardware blksize*/
sc->sc_pn = sc->sc_ps + CS4280_ICHUNK;
memcpy(sc->sc_pbuf, start, CS4280_ICHUNK);
sc->sc_rcount = blksize / CS4280_ICHUNK; /* CS4280_ICHUNK is fixed hardware blksize*/
empty_dma += CS4280_ICHUNK;
memcpy(empty_dma, sc->sc_pn, CS4280_ICHUNK);
sc->sc_pn += CS4280_ICHUNK;
empty_dma += CS4280_ICHUNK;
memcpy(sc->sc_rn, empty_dma, CS4280_ICHUNK);
sc->sc_rn += CS4280_ICHUNK;