SWREG_DMA_ADDR
SWREG_WRITE(ncr_sc, SWREG_DMA_ADDR, 0);
SWREG_WRITE(ncr_sc, SWREG_DMA_ADDR, 0);
SWREG_WRITE(ncr_sc, SWREG_DMA_ADDR, (u_int)(dh->dh_startingpa + adj));
dva = SWREG_READ(ncr_sc, SWREG_DMA_ADDR);
SWREG_WRITE(ncr_sc, SWREG_DMA_ADDR, 0);