Re: could not mount a spi-flash on rootfs

[Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>]

Hi Hiep-san,

On Thu, Jul 3, 2014 at 7:09 AM, Cao Minh Hiep <hiepcm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> On 06/30/2014 04:21 PM, Geert Uytterhoeven wrote:
> > On Mon, Jun 30, 2014 at 4:29 AM, カオ　ミン　ヒェップ <cm-hiep@jinso.co.jp> wrote:
> > > "EXT3-fs (mtdblock2): error: can't find ext3 filesystem on dev mtdblock2.
> > > EXT2-fs (mtdblock2): error: can't find an ext2 filesystem on dev
> > > mtdblock2.
> > > EXT4-fs (mtdblock2): VFS: Can't find ext4 filesystem
> > > FAT-fs (mtdblock2): bogus number of reserved sectors
> > > FAT-fs (mtdblock2): Can't find a valid FAT filesystem
> > > FAT-fs (mtdblock2): bogus number of reserved sectors
> > > FAT-fs (mtdblock2): Can't find a valid FAT filesystem
> >> mount: you must specify the filesystem type"
> > > root@linaro-nano:~# mount /dev/mtdblock2 /mnt/

> > Strange.
> >
> > Can you check that writing works using some other way, e.g. using dd?
>
> I have checked the writing works using other way (using dd command directly)
> as below:
>
> # uname -a
> Linux linaro-nano 3.10.31-ltsi-00002-g7bdf07f-dirty #1 Mon Jun 30 09:18:01
> JST 2014x
> # du -h 2.in
> 2.1M    2.in
>
> # dd if=2M.in of=/dev/mtdblock2 bs=1M count=2
> 2+0 records in
> 2+0 records out
> 2097152 bytes (2.1 MB) copied, 155.454 s, 13.5 kB/s
> root@linaro-nano:~# dd if=/dev/mtdblock2 of=2M.out bs=1M count=2
> 2+0 records in
> 2+0 records out
> 2097152 bytes (2.1 MB) copied, 83.3882 s, 25.1 kB/s
> root@linaro-nano:~# ls
> 2M.in    2M.out
> root@linaro-nano:~# md5sum 2M.in 2M.out
> bf90a4724c584901fae07749965208e3  2M.in
> bf90a4724c584901fae07749965208e3  2M.out

So writing works.

Then I guess you'll have to do more investigations:

  1. Clear /dev/mtdblock2:
         dd if=/dev/zero of=/dev/mtdblock2 bs=1M
  1. Create an ext3 file system on /dev/mtdblock2
  2. Create a file with the same size as mtdblock2:
         dd if=/dev/zero of=file bs=size count=1
  3. Create an ext3 file system on file
  4. Compare the ext3 file systems on /dev/mtdblock2 and file,
     using e.g. hd and diff -u, to find out what's different.

Once we know what the differences are, we can investigate the
failure mode.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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