IDEDMA_BYTE_COUNT_MAX
sc->sc_dma_maxsegsz = IDEDMA_BYTE_COUNT_MAX;
if ((error = bus_dmamap_create(sc->sc_dmat, IDEDMA_BYTE_COUNT_MAX,
sc->sc_dma_maxsegsz = IDEDMA_BYTE_COUNT_MAX - PAGE_SIZE;
sc->sc_dma_boundary = IDEDMA_BYTE_COUNT_MAX - PAGE_SIZE;