DMA_RX
sbdma_initctx(&(s->sbm_rxdma),s,0,DMA_RX,SBMAC_MAX_RXDESCR);
sbdma_channel_start(&(s->sbm_rxdma), DMA_RX);
if (!_dma_alloc(di, DMA_RX))
_dma_ddtable_init(di, DMA_RX, di->rxdpa);
_dma_ddtable_init(di, DMA_RX, di->rxdpa);
dmareg(DMA_RX, 0),