SCREEN_START
outl (SCREEN_START + start, VDMA_START); \
outl (SCREEN_START + end - VDMA_XFERSIZE, VDMA_END); \
outl (SCREEN_START + offset, VDMA_INIT); \
#define VIDMEM ((char *)SCREEN_START)
.pfn = __phys_to_pfn(SCREEN_START),
fb_info.fix.smem_start = SCREEN_START;