dc_dma_map_addr
sc->dc_ldata.dc_rx_list, DC_RX_LIST_SZ, dc_dma_map_addr,
sc->dc_ldata.dc_tx_list, DC_TX_LIST_SZ, dc_dma_map_addr,
DC_SFRAME_LEN, dc_dma_map_addr, &sc->dc_saddr, BUS_DMA_NOWAIT);
static void dc_dma_map_addr(void *, bus_dma_segment_t *, int, int);