[U-Boot] UBIFS - Reading superblock error

[U-Boot] UBIFS - Reading superblock error

[DATACOM - Mallmann]

Hi,
I'm trying to use UBI and UBIFS over a nand device. I want to create a
mtd partition in u-boot (with ubi part command), save a ubifs image
(with mkfs.ubifs), mount and load it with ubifs commands. The commands
that I used are listed bellow:

(environment)
mtdids=nand0=nand
mtdparts=mtdparts=nand:64m(allstuff)
partition=nand0,0
mtddevnum=0
mtddevname=allstuff


=> ubi part nand allstuff
Creating 1 MTD partitions on "NAND 64MiB 3,3V 8-bit":
0x00000000-0x04000000 : "mtd=0"
UBI: attaching mtd0 to ubi0
UBI: physical eraseblock size:   16384 bytes (16 KiB)
UBI: logical eraseblock size:    15872 bytes
UBI: smallest flash I/O unit:    512
UBI: sub-page size:              256
UBI: VID header offset:          256 (aligned 256)
UBI: data offset:                512
UBI: empty MTD device detected
UBI: create volume table (copy #1)
UBI: create volume table (copy #2)
UBI: attached mtd0 to ubi0
UBI: MTD device name:            "mtd=0"
UBI: MTD device size:            64 MiB
UBI: number of good PEBs:        4096
UBI: number of bad PEBs:         0
UBI: max. allowed volumes:       92
UBI: wear-leveling threshold:    4096
UBI: number of internal volumes: 1
UBI: number of user volumes:     0
UBI: available PEBs:             4052
UBI: total number of reserved PEBs: 44
UBI: number of PEBs reserved for bad PEB handling: 40
UBI: max/mean erase counter: 0/0


=> ubi create vol
Creating dynamic volume vol of size 64313344
=> ubi info l
UBI: volume information dump:
UBI: vol_id          0
UBI: reserved_pebs   4052
UBI: alignment       1
UBI: data_pad        0
UBI: vol_type        3
UBI: name_len        3
UBI: usable_leb_size 15872
UBI: used_ebs        4052
UBI: used_bytes      64313344
UBI: last_eb_bytes   15872
UBI: corrupted       0
UBI: upd_marker      0
UBI: name            vol

UBI: volume information dump:
UBI: vol_id          2147479551
UBI: reserved_pebs   2
UBI: alignment       1
UBI: data_pad        0
UBI: vol_type        3
UBI: name_len        13
UBI: usable_leb_size 15872
UBI: used_ebs        2
UBI: used_bytes      31744
UBI: last_eb_bytes   2
UBI: corrupted       0
UBI: upd_marker      0
UBI: name            layout volume

tftp 1000000 image.ubifs vol ${filesize}
=> ubi write 1000000 vol ${filesize}
Volume "vol" found at volume id 0
=> ubifsmount vol
UBIFS error (pid 0): ubifs_check_node: bad node length 4100
UBIFS error (pid 0): ubifs_check_node: bad node at LEB 0:0
UBIFS error (pid 0): ubifs_read_node: expected node type 6
Error reading superblock on volume 'ubi:vol'!

image.ubifs was generated with the follow command:
mkfs.ubifs -r /ubifs -m 256 -c 2180 -e 16KiB -v -g 3 -o image.ubifs
(/ubifs contains a kernel+ramdisk cramfs image.)

My question is if the error was in image.ubifs creation or some u-boot
configuration. I can't find where u-boot takes this 4100 length from. By
the way, is a volume created in u-boot able to be used in linux kernel
in read-write mode?

Thanks in advance,

Marcelo

[U-Boot] UBIFS - Reading superblock error

[Stefan Roese]

Hi Marcelo,

On Tuesday 31 March 2009, DATACOM - Mallmann wrote:
> I'm trying to use UBI and UBIFS over a nand device. I want to create a
> mtd partition in u-boot (with ubi part command), save a ubifs image
> (with mkfs.ubifs), mount and load it with ubifs commands.

The easiest way to write an UBIFS image in U-Boot is to generate an UBI image 
with includes the UBIFS volume. This is done after "mkfs.ubifs" using 
the "ubinize" command. This creates an UBI image which can be written to 
FLASH via the "normal" commands ("cp.b" for NOR, "nand write" for NAND).

Here a link for some background:

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

<snip>

> By
> the way, is a volume created in u-boot able to be used in linux kernel
> in read-write mode?

Sure. You can write an UBIFS image in U-Boot and use it read-only here. And 
later in Linux you can mount it read-write and write to it. Next time in 
U-Boot you will see the changes.

Best regards,
Stefan

=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================

[U-Boot] [resolved] UBIFS - Reading superblock error

[DATACOM - Mallmann]

Stefan Roese wrote:
> Hi Marcelo,
>
> On Tuesday 31 March 2009, DATACOM - Mallmann wrote:
>   
>> I'm trying to use UBI and UBIFS over a nand device. I want to create a
>> mtd partition in u-boot (with ubi part command), save a ubifs image
>> (with mkfs.ubifs), mount and load it with ubifs commands.
>>     
>
> The easiest way to write an UBIFS image in U-Boot is to generate an UBI image 
> with includes the UBIFS volume. This is done after "mkfs.ubifs" using 
> the "ubinize" command. This creates an UBI image which can be written to 
> FLASH via the "normal" commands ("cp.b" for NOR, "nand write" for NAND).
>
> Here a link for some background:
>
> http://www.linux-mtd.infradead.org/faq/ubifs.html#L_mkfubifs
>
> <snip>
>
>   
>> By
>> the way, is a volume created in u-boot able to be used in linux kernel
>> in read-write mode?
>>     
>
> Sure. You can write an UBIFS image in U-Boot and use it read-only here. And 
> later in Linux you can mount it read-write and write to it. Next time in 
> U-Boot you will see the changes.
>
> Best regards,
> Stefan
>
> =====================================================================
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
> =====================================================================
>
>   
Hi Stefan,

Thanks a lot for the tip. It works fine and pretty fast, like I
expected. =D

-- 
Marcelo MALLMANN Dias

DATACOM
Av.Fran?a,735-Porto Alegre,RS-90230-220
Fone 3358.1332
Fax  3358.0101
Site: www.datacom.ind.br
e-mail: mallmann at datacom.ind.br