[Balloon] need help about yaffs on S3C2410

Hir, sir
Thank you for you help about the work on yaffs, and now I want to add ECC check.
I configure the kernel to enable ECC Check, but when I run the kernel ...
There is : Reading data from NAND FLASH without ECC is not recommended
I use your s3c2410nd.c, the message is in nand.c
int eccmode = oobsel->useecc ? this->eccmode : NAND_ECC_NONE; ////????????????
int *oob_config = oobsel->eccpos;
I don't know where enable the oob->useecc ?
Thank you !