atmel_nand_pmecc_enable
ret = atmel_nand_pmecc_enable(chip, NAND_ECC_WRITE, raw);
ret = atmel_nand_pmecc_enable(chip, NAND_ECC_READ, raw);
ret = atmel_nand_pmecc_enable(chip, NAND_ECC_WRITE, raw);
ret = atmel_nand_pmecc_enable(chip, NAND_ECC_READ, raw);