init_constants_early: too small LEBs?

init_constants_early: too small LEBs?

[Ralf Schlatterbeck]

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? 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.

Thanks
Ralf
-- 
Dr. Ralf Schlatterbeck                  Tel:   +43/2243/26465-16
Open Source Consulting                  www:   http://www.runtux.com
Reichergasse 131, A-3411 Weidling       email: office@runtux.com

Re: init_constants_early: too small LEBs?

[Boris Brezillon]

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

Re: init_constants_early: too small LEBs?

[Ralf Schlatterbeck]

On Sun, Nov 20, 2016 at 10:51:41AM +0100, Boris Brezillon wrote:
> 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.
> 
> 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.

I also need to reinitialize the complete filesystem if something is
inconsistent from a known-good source (in that case on a NAND flash).
The idea was to ubiformat everything (which preserves wear counters) and
re-create the filesystem on top of it (and in the first place I thought
I'd use ubifs). I don't think there is a way to re-create a jffs *and*
preserving wear counters?

Thanks
Ralf
-- 
Dr. Ralf Schlatterbeck                  Tel:   +43/2243/26465-16
Open Source Consulting                  www:   http://www.runtux.com
Reichergasse 131, A-3411 Weidling       email: office@runtux.com