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Subject: Re: UBIFS mount failure on NOR flash
From: Artem Bityutskiy <dedekind1@gmail.com>
To: pjohn@mvista.com
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Date: Tue, 15 Jun 2010 16:37:27 +0300
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On Tue, 2010-06-15 at 18:29 +0530, Philby John wrote:
> Hello,
> 
> Platform: Cavium CN5020
> Filesystem: UBIFS
> Flash Type: NOR
> Flash Size: 8MB
> Partition Details Kernel Log:
> Creating 2 MTD partitions on "phys_mapped_flash":
> 0x000000000000-0x000000700000 : "Octeon BOOT partition"
> 0x000000700000-0x000000800000 : "Octeon test partition"
> 
> 
> $mount -t ubifs ubi1:test /mnt/nor
> UBIFS error (pid 851): init_constants_early: too few LEBs (12), min. is 17
> mount: wrong fs type, bad option, bad superblock on ubi1:test,
>        missing codepage or helper program, or other error
>        (for several filesystems (e.g. nfs, cifs) you might
>        need a /sbin/mount.<type> helper program)
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so
> 
> 
> But JFFS2 is able to mount the same partition flawlessly. Shouldn't
> UBIFS be able to do the same? What I would like to know is, is this the
> expected behavior or a bug? If its a bug I would like to look into it.

Yes, this is expected. For such a tiny flash partition you should rather
use JFFS2. I've just created a FAQ entry for you:

http://www.linux-mtd.infradead.org/faq/ubifs.html#L_few_lebs

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)