DMA_C
sc->sc_type = (rev == 'B') ? DMA_B : DMA_C;
MVSATA_EDMA_WRITE_4(mvport, DMA_C, DMA_C_READ);
MVSATA_EDMA_WRITE_4(mvport, DMA_C, 0);
MVSATA_EDMA_WRITE_4(mvport, DMA_C,
MVSATA_EDMA_READ_4(mvport, DMA_C) | DMA_C_START);