AHC_NSEG
newcount = (PAGE_SIZE / (AHC_NSEG * sizeof(struct ahc_dma_seg)));
AHC_MAXTRANSFER_SIZE, AHC_NSEG, MAXPHYS, 0,
segs += AHC_NSEG;
physaddr += (AHC_NSEG * sizeof(struct ahc_dma_seg));