VDMA_XFERSIZE
outl (SCREEN_START + end - VDMA_XFERSIZE, VDMA_END); \
if (offset >= end - VDMA_XFERSIZE) \
memc_write (VDMA_END, (end - VDMA_XFERSIZE) >> 2); \
unsigned long size = info->fix.smem_len - VDMA_XFERSIZE;