PLATINUM_CMAP_ADDR_OFFSET
platinumfb_write_cmap_reg(sc, PLATINUM_CMAP_ADDR_OFFSET, a + 32);
platinumfb_write_cmap_reg(sc, PLATINUM_CMAP_ADDR_OFFSET, reg);
platinumfb_write_cmap_reg(sc, PLATINUM_CMAP_ADDR_OFFSET, 3+32);
platinumfb_write_cmap_reg(sc, PLATINUM_CMAP_ADDR_OFFSET, 0x40);