PAL_NONE
pal = (bpp >= 16) ? PAL_NONE : PAL_BASE + (branch ? PAL_MAX : 0);
setup_frame_dma(fbi, dma + 1, PAL_NONE, offset + nbytes, nbytes);
setup_frame_dma(ofb->fbi, DMA_OV1, PAL_NONE, start, size);