ECC_BCH8_PARITY_BYTES
#define ECC_BCH8_INFO_BYTES (ECC_BCH8_USER_BYTES + ECC_BCH8_PARITY_BYTES)
oobregion->length = ECC_BCH8_PARITY_BYTES;
nand->ecc.ctx.total = nand->ecc.ctx.nsteps * ECC_BCH8_PARITY_BYTES;