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From: Simon Liddicott <simon@liddicott.com>
Date: Fri, 18 Oct 2013 12:41:50 +0100
Message-ID: <CALuNSF7A=PBpyP4=nEEKvuhAMAQJvucGddhHPuxSuqZuCTnmEg@mail.gmail.com>
Subject: Re: nandsim LEB size mismatch
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On 11 October 2013 14:57, Simon Liddicott <simon@liddicott.com> wrote:
> Hi
>
> I've searched the archives and read the FAQ but not found anything
> that matches my situation.
>
> I am trying to read an image I think is made for an MT29F2G08ABAEA.
>
> I have run the following:
>
> $ sudo modprobe nandsim first_id_byte=0x2c second_id_byte=0xda \
> third_id_byte=0x90 fourth_id_byte=0x95
> $ sudo flash_erase /dev/mtd0 0 0
> $ sudo modprobe ubi mtd=0
> $ sudo ubimkvol /dev/ubi0 -N RFS -s $((0xA00000))
>
> Volume ID 0, size 82 LEBs (10579968 bytes, 10.1 MiB), LEB size 129024
> bytes (126.0 KiB), dynamic, name "RFS", alignment 1
>
> $ sudo ubiupdatevol /dev/ubi0_0 RFS.bin
> $ sudo mount /dev/ubi0_0 /mnt
>
> mount: wrong fs type, bad option, bad superblock on /dev/ubi0_0,
>        missing codepage or helper program, or other error
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so
>
> [1975256.515179] UBIFS error (pid 10309): validate_sb: LEB size
> mismatch: 126976 in superblock, 129024 real
>
> I think that nandsim provides the 'real' value for LEB size, and even
> if the value is right - how can I read the data that expects a 124KiB
> LEB size?
>
> Any help appreciated.
>
> Thanks in advance.
>
> Simon.


I didn't get a reply, but have managed to find out how to do it.

The correct instructions should be:
$ sudo modprobe nandsim first_id_byte=0x2c second_id_byte=0xda \
third_id_byte=0x90 fourth_id_byte=0x95
$ sudo flash_erase /dev/mtd0 0 0
$ sudo ubiformat /dev/mtd0 -s 2048 -O 2048
$ sudo modprobe ubi
$ sudo ubiattach -m 0 -d 0 -O 2048
$ sudo ubimkvol /dev/ubi0 -N RFS -s $((0xA00000))
$ sudo ubiupdatevol /dev/ubi0_0 RFS.bin
$ sudo mount /dev/ubi0_0 /mnt

Success!