ECC_BCH8_USER_BYTES
#define ECC_BCH8_INFO_BYTES (ECC_BCH8_USER_BYTES + ECC_BCH8_PARITY_BYTES)
step_size = auto_oob ? ECC_BCH8_INFO_BYTES : ECC_BCH8_USER_BYTES;
oobregion->offset = ECC_BCH8_USER_BYTES + (section * ECC_BCH8_INFO_BYTES);
oobregion->length = ECC_BCH8_USER_BYTES;
nand->ecc.ctx.nsteps * ECC_BCH8_USER_BYTES)))