GFFB_PDIO1
GFFB_WRITE_1(GFFB_PDIO1 + GFFB_PEL_IW, idx);
GFFB_WRITE_1(GFFB_PDIO1 + GFFB_PEL_D, r);
GFFB_WRITE_1(GFFB_PDIO1 + GFFB_PEL_D, g);
GFFB_WRITE_1(GFFB_PDIO1 + GFFB_PEL_D, b);
GFFB_WRITE_1(GFFB_PDIO1 + GFFB_PEL_MASK, 0xff);