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From: "Dimitar Penev" <dpn@ucpbx.com>
To: <linux-mtd@lists.infradead.org>
Subject: setup ubifs
Date: Thu, 17 Sep 2009 18:29:11 +0300
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Hi Guys,

I am tring to setup ubifs on an blackfin based embeded platform containg 
nand flash.
jffs2 is working ok on it.

So I have compiled the uclinux (kernel 2.6.28.10) with ubifs/mtd_ubi static 
support
If I pass with the bootargs ubi.mtd=3 , during booting I see

...
UBI: attaching mtd3 to ubi0
UBI: physical eraseblock size: 262144 bytes (256 KiB)
UBI: logical eraseblock size: 258048 bytes
UBI: smallest flash I/O unit: 2048
UBI: VID header offset: 2048 (aligned 2048)
UBI: data offset: 4096
UBI: empty MTD device detected
UBI: create volume table (copy #1)
UBI: create volume table (copy #2)
UBI: attached mtd3 to ubi0
UBI: MTD device name: "persistent file system"
UBI: MTD device size: 1004 MiB
UBI: number of good PEBs: 3974
UBI: number of bad PEBs: 42
UBI: max. allowed volumes: 128
UBI: wear-leveling threshold: 4096
UBI: number of internal volumes: 1
UBI: number of user volumes: 0
UBI: available PEBs: 3931
UBI: total number of reserved PEBs: 43
UBI: number of PEBs reserved for bad PEB handling: 39
UBI: max/mean erase counter: 0/0
UBI: background thread "ubi_bgt0d" started, PID 122
...

ubinfo gives me

root@pr1:~> /bin/ubinfo
UBI version: 1
Count of UBI devices: 1
UBI control device major/minor: 10:63
Present UBI devices: ubi0

I don't have /dev/ubi0 nor /dev/ubi_ctrl, however I do have some ubi stuff 
in my /sys file system

root@pr1:~> ls /sys/class/ubi/ubi0/
/sys/class/ubi/ubi0/avail_eraseblocks /sys/class/ubi/ubi0/min_io_size
/sys/class/ubi/ubi0/bad_peb_count /sys/class/ubi/ubi0/mtd_num
/sys/class/ubi/ubi0/bgt_enabled /sys/class/ubi/ubi0/reserved_for_bad
/sys/class/ubi/ubi0/dev /sys/class/ubi/ubi0/subsystem/
/sys/class/ubi/ubi0/eraseblock_size /sys/class/ubi/ubi0/total_eraseblocks
/sys/class/ubi/ubi0/max_ec /sys/class/ubi/ubi0/uevent
/sys/class/ubi/ubi0/max_vol_count /sys/class/ubi/ubi0/volumes_count

root@pr1:~> ls /sys/class/misc/ubi_ctrl/
/sys/class/misc/ubi_ctrl/dev /sys/class/misc/ubi_ctrl/uevent
/sys/class/misc/ubi_ctrl/subsystem/

I don't have /dev/ubi_ctrl so I can not crete (ubimkvol) ubi volume.

Can you please give me some pointers.

Best Regards
Dimitar Penev