gpmi-nand driver and jffs2 support

[Huang Shijie]

On Fri, Aug 30, 2013 at 06:41:58PM +0200, Hector Palacios wrote:
> Hi Fabio,
> 
> >
> >On Fri, Aug 30, 2013 at 1:31 PM, Hector Palacios
> ><hector.palacios at digi.com> wrote:
> >>Ok I merged the linux-next MTD patches.
> >>This is what I get from the printk:
> >>
> >>[    0.841333] [ set_geometry_by_ecc_info ] 36, 28

ok, we have enough spare area to store the marker.

I think this SLC should be okay with jffs2.

> >>
> >>The partition now partially mounts (I can see a few of the folders and
> >>files) but I get thousands of errors like these:
> >>
> >>[  118.210985] jffs2: mtd->read(0x100 bytes from 0x0) returned ECC error
> >>[  118.255424] jffs2: mtd->read(0x1ff20 bytes from 0xe0) returned ECC error
> >>[  118.255561] jffs2: jffs2_scan_inode_node(): CRC failed on node at
> >>0x000001ec: Read 0x00000000, calculated 0xa587e8ba
> >>[  118.255602] jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not
> >>found at 0x00000234: 0x1cf7 instead
> >
> >This error is most likely because you generated a jffs2 rootfs with a
> >eraseblock size that does not match the one of your NAND device.
> 
> No. I used 128k erase block that matches my NAND. I also checked
> that I can mount the jffs2 partition correctly using my v2.6.35
> kernel, so the partition seems to be correctly written.
> 

Please use following steps and try again:
    flash_eraseall /dev/mtdx
    mount -t jffs2 /dev/mtdblockx tmp


thanks
Huang Shijie