UBI use subpage and verify fail when write on nandflash

[Brian Norris]

Add Jon,

On Tue, Apr 17, 2012 at 7:19 AM, b w <wdjjwb at gmail.com> wrote:
> Hello,
>    Use linux 2.6.32,ARM,nandflash(support subpage),config
> CONFIG_MTD_NAND_VERIFY_WRITE. UBI attach fail on empty flash.I found
> when UBI write VID header to the second subpage of eraseblock,will
> call function "nand_write_page",this function write a whole page(i
> think the page size is 2048),the unset bit of the buf is filled with
> 0xff,after write,
>
> #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
>        /* Send command to read back the data */
>        chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
>
>        if (chip->verify_buf(mtd, buf, mtd->writesize))
>                return -EIO;
> #endif
>
> now,the buf for verify is not equal to the buf which write,because the
> buf which read from flash contains EC header ?
>
> I found there is topic also mention subpage:
> http://lists.infradead.org/pipermail/linux-mtd/2010-September/031822.html

Hmm, not sure if this is exactly the same issue, but it is related.
It's worth CC'ing Jon to see if he pursued this at all.

Brian