SUNXI_MMC_WIDTH
MMC_READ(sc, SUNXI_MMC_WIDTH));
MMC_WRITE(sc, SUNXI_MMC_WIDTH, SUNXI_MMC_WIDTH_1);
MMC_WRITE(sc, SUNXI_MMC_WIDTH, SUNXI_MMC_WIDTH_4);
MMC_WRITE(sc, SUNXI_MMC_WIDTH, SUNXI_MMC_WIDTH_8);