On Wed, Sep 10, 2014 at 10:55:39AM +0200, Boris BREZILLON wrote:
+static int gpmi_ecc_read_page_raw(struct mtd_info *mtd,
> + struct nand_chip *chip, uint8_t *buf,
> + int oob_required, int page)
> +{
> + struct gpmi_nand_data *this = chip->priv;
> + struct bch_geometry *nfc_geo = &this->bch_geometry;
> + int eccsize = nfc_geo->ecc_chunk_size;
> + int eccbytes = DIV_ROUND_UP(nfc_geo->ecc_strength * nfc_geo->gf_len,
> + 8);
In actually, the ECC can be _NOT_ bytes aligned.
you should not round up to byte.
it's hard to implement this hook.
thanks
Huang Shijie
> + uint8_t *oob = chip->oob_poi;
> + int step;
> + int column = 0;
> + uint8_t *orig_buf = buf;
> +
> + chip->read_buf(mtd, oob, nfc_geo->metadata_size);
> + oob += nfc_geo->metadata_size;
> +
> + column += nfc_geo->metadata_size;
> + for (step = 0; step < nfc_geo->ecc_chunk_count; step++) {
> + chip->read_buf(mtd, buf, eccsize);
> + buf += eccsize;
> + column += eccsize;
> + chip->read_buf(mtd, oob, eccbytes);
> + oob += eccbytes;
> + column += eccbytes;
> + }
> +
> + if (column < mtd->writesize + mtd->oobsize)
> + chip->read_buf(mtd, oob,
> + mtd->writesize + mtd->oobsize - column);
> +
> + block_mark_swapping(this, orig_buf, chip->oob_poi);
> +
> + return 0;
> +}
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