On Wed, Dec 14, 2016 at 09:00:03AM +0100, Jan Remmet wrote:
> There are other ecc modes for the fcb out there.
sorry double post :(
Jan
>
> Signed-off-by: Jan Remmet <j.remmet@xxxxxxxxx>
> ---
> common/imx-bbu-nand-fcb.c | 83 +++++++++++++++++++++++++++--------------------
> 1 file changed, 47 insertions(+), 36 deletions(-)
>
> diff --git a/common/imx-bbu-nand-fcb.c b/common/imx-bbu-nand-fcb.c
> index 1db4c5a..34a5f83 100644
> --- a/common/imx-bbu-nand-fcb.c
> +++ b/common/imx-bbu-nand-fcb.c
> @@ -167,6 +167,46 @@ static uint32_t calc_chksum(void *buf, size_t size)
> return ~chksum;
> }
>
> +struct fcb_block *read_fcb_hamming_13_8(void *rawpage)
> +{
> + int i;
> + int bitflips = 0, bit_to_flip;
> + u8 parity, np, syndrome;
> + u8 *fcb, *ecc;
> +
> + fcb = rawpage + 12;
> + ecc = rawpage + 512 + 12;
> +
> + for (i = 0; i < 512; i++) {
> + parity = ecc[i];
> + np = calculate_parity_13_8(fcb[i]);
> +
> + syndrome = np ^ parity;
> + if (syndrome == 0)
> + continue;
> +
> + if (!(hweight8(syndrome) & 1)) {
> + pr_err("Uncorrectable error at offset %d\n", i);
> + return ERR_PTR(-EIO);
> + }
> +
> + bit_to_flip = lookup_single_error_13_8(syndrome);
> + if (bit_to_flip < 0) {
> + pr_err("Uncorrectable error at offset %d\n", i);
> + return ERR_PTR(-EIO);
> + }
> +
> + bitflips++;
> +
> + if (bit_to_flip > 7)
> + ecc[i] ^= 1 << (bit_to_flip - 8);
> + else
> + fcb[i] ^= 1 << bit_to_flip;
> + }
> +
> + return xmemdup(rawpage + 12, 512);
> +}
> +
> static __maybe_unused void dump_fcb(void *buf)
> {
> struct fcb_block *fcb = buf;
> @@ -258,11 +298,8 @@ static ssize_t raw_write_page(struct mtd_info *mtd, void *buf, loff_t offset)
>
> static int read_fcb(struct mtd_info *mtd, int num, struct fcb_block **retfcb)
> {
> - int i;
> - int bitflips = 0, bit_to_flip;
> - u8 parity, np, syndrome;
> - u8 *fcb, *ecc;
> int ret;
> + struct fcb_block *fcb;
> void *rawpage;
>
> *retfcb = NULL;
> @@ -275,40 +312,14 @@ static int read_fcb(struct mtd_info *mtd, int num, struct fcb_block **retfcb)
> goto err;
> }
>
> - fcb = rawpage + 12;
> - ecc = rawpage + 512 + 12;
> -
> - for (i = 0; i < 512; i++) {
> - parity = ecc[i];
> - np = calculate_parity_13_8(fcb[i]);
> -
> - syndrome = np ^ parity;
> - if (syndrome == 0)
> - continue;
> -
> - if (!(hweight8(syndrome) & 1)) {
> - pr_err("Uncorrectable error at offset %d\n", i);
> - ret = -EIO;
> - goto err;
> - }
> -
> - bit_to_flip = lookup_single_error_13_8(syndrome);
> - if (bit_to_flip < 0) {
> - pr_err("Uncorrectable error at offset %d\n", i);
> - ret = -EIO;
> - goto err;
> - }
> -
> - bitflips++;
> -
> - if (bit_to_flip > 7)
> - ecc[i] ^= 1 << (bit_to_flip - 8);
> - else
> - fcb[i] ^= 1 << bit_to_flip;
> + fcb = read_fcb_hamming_13_8(rawpage);
> + if (IS_ERR(fcb)) {
> + pr_err("Cannot read fcb\n");
> + ret = PTR_ERR(fcb);
> + goto err;
> }
>
> - *retfcb = xmemdup(rawpage + 12, 512);
> -
> + *retfcb = fcb;
> ret = 0;
> err:
> free(rawpage);
> --
> 2.7.4
>
>
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