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Date: Sun, 20 Nov 2016 10:51:41 +0100
From: Boris Brezillon <boris.brezillon@free-electrons.com>
To: Ralf Schlatterbeck <rsc@runtux.com>
Cc: linux-mtd@lists.infradead.org
Subject: Re: init_constants_early: too small LEBs?
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Hi Ralf,

On Sat, 19 Nov 2016 22:25:08 +0100
Ralf Schlatterbeck <rsc@runtux.com> wrote:

> I'm trying to get an ubifs on a 2MB NOR flash.
> 
> I'm following the usual steps for generating everything from inside the 
> embedded system:
> ubiformat /dev/mtd7
> ubiattach /dev/ubi_ctrl -m 7 -d 7
> ubimkvol /dev/ubi7 -N testvol -s 1968KiB
> 
> But when I try to mount I'm getting:
> # mount -t ubifs /dev/ubi7_0 /mnt/
> mount: mounting /dev/ubi7_0 on /mnt/ failed: Invalid argument
> 
> and the kernel log tells me:
> Nov 19 21:07:33 board kernel: UBIFS error (pid 1504):
> init_constants_early: too small LEBs (3968 bytes), min. is 15360 bytes
> 
> Any advice on what to try next?
> 
> Should I use a jffs2 on top of UBI using gluebi or run jffs2 on the
> naked md device instead?

Why not putting JFFS2 directly on your MTD device (no UBI in the
middle).

> I'd really like to be bad block tolerant but
> don't know if this makes sense with NOR-Flash (of this size) at all.

You shouldn't need UBI, AFAIR, JFFS2 already deals with
wear-leveling/bad-block problems.

Regards,

Boris