Not able to mount to a data partition with UBIFS

[Govinda]

Hi all,

I am new to ubifs. And, am facing the below problem.

I have a 32MB nand flash.
and Creating 5 MTD partitions on "atmel_nand"

[42949373.400000] 0x00000000-0x00100000 : "Bootstrap"
[42949373.410000] 0x00100000-0x00300000 : "Kernel"
[42949373.410000] 0x00300000-0x01400000 : "FileSystem"
[42949373.420000] 0x01400000-0x01d00000 : "DataSection"
[42949373.430000] 0x01d00000-0x02000000 : "DfltArea"


Here rootfs is mounted successfully. below is the log:

[42949373.440000] UBI: attaching mtd2 to ubi0
[42949373.440000] UBI: physical eraseblock size:   131072 bytes (128 KiB)
[42949373.450000] UBI: logical eraseblock size:    129024 bytes
[42949373.450000] UBI: smallest flash I/O unit:    2048
[42949373.460000] UBI: sub-page size:              512
[42949373.460000] UBI: VID header offset:          512 (aligned 512)
[42949373.470000] UBI: data offset:                2048
[42949373.510000] UBI: attached mtd2 to ubi0
[42949373.510000] UBI: MTD device name:            "FileSystem"
[42949373.520000] UBI: MTD device size:            17 MiB
[42949373.520000] UBI: number of good PEBs:        136
[42949373.530000] UBI: number of bad PEBs:         0
[42949373.530000] UBI: max. allowed volumes:       128
[42949373.540000] UBI: wear-leveling threshold:    4096
[42949373.540000] UBI: number of internal volumes: 1
[42949373.550000] UBI: number of user volumes:     1
[42949373.550000] UBI: available PEBs:             0
[42949373.560000] UBI: total number of reserved PEBs: 136
[42949373.560000] UBI: number of PEBs reserved for bad PEB handling: 2
[42949373.570000] UBI: max/mean erase counter: 2/0

After the system booted up, from the command prompt:
Since the DataSection partion number is 3, and
when am trying to mount a partition "DataSection", It seems getting
mounted succefully.

But, the data is not visible at the mounted path.

Below are the sequence of commands that I have used to mount a partition:

# ubiformat /dev/mtd3 -s 512
ubiformat: mtd3 (nand), size 9437184 bytes (9.0 MiB), 72 eraseblocks
of 131072 bytes (128.0 KiB), min. I/O size 2048 bytes
libscan: scanning eraseblock 71 -- 100 % complete
ubiformat: 72 eraseblocks have valid erase counter, mean value is 5
ubiformat: formatting eraseblock 71 -- 100 % complete
# ubiattach /dev/ubi_ctrl -m 3
[ 4352.750000] UBI: attaching mtd3 to ubi1
[ 4352.760000] UBI: physical eraseblock size:   131072 bytes (128 KiB)
[ 4352.760000] UBI: logical eraseblock size:    129024 bytes
[ 4352.770000] UBI: smallest flash I/O unit:    2048
[ 4352.770000] UBI: sub-page size:              512
[ 4352.780000] UBI: VID header offset:          512 (aligned 512)
[ 4352.780000] UBI: data offset:                2048
[ 4352.850000] UBI: attached mtd3 to ubi1
[ 4352.850000] UBI: MTD device name:            "DataSection"
[ 4352.860000] UBI: MTD device size:            9 MiB
[ 4352.860000] UBI: number of good PEBs:        72
[ 4352.870000] UBI: number of bad PEBs:         0
[ 4352.870000] UBI: max. allowed volumes:       128
[ 4352.880000] UBI: wear-leveling threshold:    4096
[ 4352.880000] UBI: number of internal volumes: 1
[ 4352.890000] UBI: number of user volumes:     0
[ 4352.890000] UBI: available PEBs:             66
[ 4352.900000] UBI: total number of reserved PEBs: 6
[ 4352.900000] UBI: number of PEBs reserved for bad PEB handling: 2
[ 4352.910000] UBI: max/mean erase counter: 13/6
[ 4352.910000] UBI: background thread "ubi_bgt1d" started, PID 32460

# ubiattach /dev/ubi_ctrl -m 3

# ubinfo -a
UBI version:                    1
Count of UBI devices:           2
UBI control device major/minor: 10:63
Present UBI devices:            ubi0, ubi1

ubi0
Volumes count:                           1
Logical eraseblock size:                 129024 bytes, 126.0 KiB
Total amount of logical eraseblocks:     136 (17547264 bytes, 16.7 MiB)
Amount of available logical eraseblocks: 0 (0 bytes)
Maximum count of volumes                 128
Count of bad physical eraseblocks:       0
Count of reserved physical eraseblocks:  2
Current maximum erase counter value:     2
Minimum input/output unit size:          2048 bytes
Character device major/minor:            253:0
Present volumes:                         0

Volume ID:   0 (on ubi0)
Type:        dynamic
Alignment:   1
Size:        130 LEBs (16773120 bytes, 16.0 MiB)
State:       OK
Name:        rootfs
Character device major/minor: 253:1

===================================
ubi1
Volumes count:                           0
Logical eraseblock size:                 129024 bytes, 126.0 KiB
Total amount of logical eraseblocks:     72 (9289728 bytes, 8.9 MiB)
Amount of available logical eraseblocks: 66 (8515584 bytes, 8.1 MiB)
Maximum count of volumes                 128
Count of bad physical eraseblocks:       0
Count of reserved physical eraseblocks:  2
Current maximum erase counter value:     13
Minimum input/output unit size:          2048 bytes
Character device major/minor:            251:0

# mknod /dev/ubi1 c 251 0

# ubimkvol /dev/ubi1 -N DataSection -s 6838272
Volume ID 0, size 53 LEBs (6838272 bytes, 6.5 MiB), LEB size 129024
bytes (126.0 KiB), dynamic, name "DataSection", alignment 1

# mount -t ubifs ubi1:DataSection /mnt/mtd3_DataSection/
[ 4622.320000] UBIFS: default file-system created
[ 4622.340000] UBIFS: background thread "ubifs_bgt1_0" started, PID 1876
[ 4622.410000] UBIFS: mounted UBI device 1, volume 0, name "DataSection"
[ 4622.410000] UBIFS: file system size: 5548032 bytes (5418 KiB, 5 MiB, 43 LEBs)
[ 4622.420000] UBIFS: journal size: 1032193 bytes (1008 KiB, 0 MiB, 6 LEBs)
[ 4622.430000] UBIFS: default compressor: LZO
[ 4622.430000] UBIFS: media format 4, latest format 4

#cd /mnt/mtd3_DataSection/
# ls
<No data visible, but expected the same data.>


AND
adding some more info...

Utils and args used to build the xxxx.ubi
# mkfs.ubifs -r DefaultElems -m 2048 -e 129024 -c 2048 -o default.ubifs -x lzo
# ubinize -o default-elm.ubi -m 2048 -p 128KiB -s 512 default.cfg

here 'DefaultElems' directory contains some sub dirs and some data as
well. (the same data expecting after mount operation  )
default.cfg:
[default-elm]
mode=ubi
image=default.ubifs
vol_id=0
vol_type=dynamic
vol_name=DataSection

and the resultant image default-elm.ubi flashed at the partition
'DataSection' (0x01400000-0x01d00000 : "DataSection")
kernel version : 2.6.27


Could someone please help me...


 Thanks &
Regards,
Govinda.