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Subject: Re: Create, Flash and Mount UBIFS Images
From: Artem Bityutskiy <dedekind@infradead.org>
To: Manuel Sahm <Manuel.Sahm@feig.de>
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Date: Thu, 02 Apr 2009 14:42:28 +0300
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Hi,

On Thu, 2009-04-02 at 13:36 +0200, Manuel Sahm wrote:
> Hello, 
> 
> Could anybody explain me how to build an ubi.img that I could flash
> inside my system ? 
> 
> NAND Flash: Micron 256 MByte 
> Physical Eraseblock Size = 131072 
> Logical Eraseblock Size = 129024 
> Min I/O Size = 2048 
> SubPage = 512 
> 
> The Partition /dev/mtd6 is 32MByte. 
> 
> 
> I did the following steps: 
> On my host I created the file through: 
> 
> mkfs.ubifs -d /exports/ -m 2048 -e 129024 -o ubifs.img -x "none" -c
> 2047 
> ubinize -p 128KiB -m 2048 -s 512 -O 512 -o ubi.img ubi.ini 
> 
> with ubi.ini 
> [TEST] 
> mode=ubi 
> image=ubifs.img 
> vol_id=0 
> vol_size=3MiB 
> vol_type=dynamic 
> vol_alignment=1 
> vol_flags=autoresize 
> 
> Then I copy this creted ubi.img to my embedded system. 
> 
> On my embedded system I did: 
> flash_eraseall /dev/mtd6 
> ubiformat /dev/mtd6 -s 512 -f ubi.img 
> ubiattach /dev/ubi_ctrl -m6 -d6 -O512 
> mount -t ubifs ubi6_0 /mnt/ubi6 
> 
> Then at the mount command I got the error: 
> validate_sb: bad superblock 
> 
> So what´s wrong ? 

Could you please try to enable debugging, as it is asked here:

http://www.linux-mtd.infradead.org/doc/ubifs.html#L_how_send_bugreport

And I do not understand why you did not provide all UBIFS output.
The print is:

ubifs_err("bad superblock, error %d", err);

and you did not provide error code number.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)