AHC_NSEG
newcount = (PAGE_SIZE / (AHC_NSEG * sizeof(struct ahc_dma_seg)));
segs += AHC_NSEG;
physaddr += (AHC_NSEG * sizeof(struct ahc_dma_seg));
host->sg_tablesize = AHC_NSEG;
if ((scb->sg_count + 1) > AHC_NSEG)
ahc->scb_data->numscbs, AHC_NSEG);