mtd_peb_write broken on dataflash

Sascha Hauer s.hauer at pengutronix.de
Fri Sep 21 00:11:11 PDT 2018


Hi Ladis,

On Thu, Sep 20, 2018 at 08:27:01PM +0200, Ladislav Michl wrote:
> As mtd_peb_write checks for alignment, it fails writing to dataflash:
> barebox$ state -s
> ERROR: state: Failed to write PEB 0, -22
> ERROR: state: Failed to write circular to 0 length 48, -22
> WARNING: state: Failed to write state backend bucket, -22
> ERROR: state: Failed to write PEB 1, -22
> ERROR: state: Failed to write circular to 0 length 48, -22
> WARNING: state: Failed to write state backend bucket, -22
> ERROR: state: Failed to write PEB 2, -22
> ERROR: state: Failed to write circular to 0 length 48, -22

How I read the code the length should be writesize aligned...

> diff --git a/drivers/mtd/peb.c b/drivers/mtd/peb.c
> index c35b63f2f..6035fbc45 100644
> --- a/drivers/mtd/peb.c
> +++ b/drivers/mtd/peb.c
> @@ -376,7 +376,7 @@ int mtd_peb_write(struct mtd_info *mtd, const void *buf, int pnum, int offset,
>  		return -EINVAL;
>  	if (len <= 0)
>  		return -EINVAL;
> -	if (len % (mtd->writesize >> mtd->subpage_sft))
> +	if (mtd->type != MTD_DATAFLASH && len % (mtd->writesize >> mtd->subpage_sft))

So how big is mtd->writesize here and is this value correct?

In state_storage_mtd_buckets_init() we have:

        if (circular)
                writesize = meminfo->writesize;
        else
                writesize = meminfo->erasesize;

How big are meminfo->writesize and meminfo->erasesize here and
which path is chosen?

Sascha

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