mtd->writesize = CONFIG_SYS_NAND_PAGE_SIZE;
mtd->oobsize = CONFIG_SYS_NAND_OOBSIZE;
nand_chip.IO_ADDR_R = (void __iomem *)CONFIG_SYS_NAND_BASE;
mtd->writesize = CONFIG_SYS_NAND_PAGE_SIZE;
mtd->oobsize = CONFIG_SYS_NAND_OOBSIZE;
nand_chip.IO_ADDR_R = (void __iomem *)CONFIG_SYS_NAND_BASE;