SIS_ADDR_LO
sc->sis_tx_list[i].sis_next = htole32(SIS_ADDR_LO(next));
rxd->rx_desc->sis_next = htole32(SIS_ADDR_LO(next));
rxd->rx_desc->sis_ptr = htole32(SIS_ADDR_LO(segs[0].ds_addr));
f->sis_ptr = htole32(SIS_ADDR_LO(segs[i].ds_addr));
CSR_WRITE_4(sc, SIS_RX_LISTPTR, SIS_ADDR_LO(sc->sis_rx_paddr));
CSR_WRITE_4(sc, SIS_TX_LISTPTR, SIS_ADDR_LO(sc->sis_tx_paddr));