223 lines
6.4 KiB
Plaintext
223 lines
6.4 KiB
Plaintext
-------------------
|
|
UBI usage in U-Boot
|
|
-------------------
|
|
|
|
UBI support in U-Boot is broken down into five separate commands.
|
|
The first is the ubi command, which has six subcommands:
|
|
|
|
=> help ubi
|
|
ubi - ubi commands
|
|
|
|
Usage:
|
|
ubi part [part] [offset]
|
|
- Show or set current partition (with optional VID header offset)
|
|
ubi info [l[ayout]] - Display volume and ubi layout information
|
|
ubi create[vol] volume [size] [type] - create volume name with size
|
|
ubi write[vol] address volume size - Write volume from address with size
|
|
ubi read[vol] address volume [size] - Read volume to address with size
|
|
ubi remove[vol] volume - Remove volume
|
|
[Legends]
|
|
volume: character name
|
|
size: specified in bytes
|
|
type: s[tatic] or d[ynamic] (default=dynamic)
|
|
|
|
|
|
The first command that is needed to be issues is "ubi part" to connect
|
|
one mtd partition to the UBI subsystem. This command will either create
|
|
a new UBI device on the requested MTD partition. Or it will attach a
|
|
previously created UBI device. The other UBI commands will only work
|
|
when such a UBI device is attached (via "ubi part"). Here an example:
|
|
|
|
=> mtdparts
|
|
|
|
device nor0 <1fc000000.nor_flash>, # parts = 6
|
|
#: name size offset mask_flags
|
|
0: kernel 0x00200000 0x00000000 0
|
|
1: dtb 0x00040000 0x00200000 0
|
|
2: root 0x00200000 0x00240000 0
|
|
3: user 0x01ac0000 0x00440000 0
|
|
4: env 0x00080000 0x01f00000 0
|
|
5: u-boot 0x00080000 0x01f80000 0
|
|
|
|
active partition: nor0,0 - (kernel) 0x00200000 @ 0x00000000
|
|
|
|
defaults:
|
|
mtdids : nor0=1fc000000.nor_flash
|
|
mtdparts: mtdparts=1fc000000.nor_flash:2m(kernel),256k(dtb),2m(root),27392k(user),512k(env),512k(u-boot)
|
|
|
|
=> ubi part root
|
|
Creating 1 MTD partitions on "nor0":
|
|
0x000000240000-0x000000440000 : "mtd=2"
|
|
UBI: attaching mtd1 to ubi0
|
|
UBI: physical eraseblock size: 262144 bytes (256 KiB)
|
|
UBI: logical eraseblock size: 262016 bytes
|
|
UBI: smallest flash I/O unit: 1
|
|
UBI: VID header offset: 64 (aligned 64)
|
|
UBI: data offset: 128
|
|
UBI: attached mtd1 to ubi0
|
|
UBI: MTD device name: "mtd=2"
|
|
UBI: MTD device size: 2 MiB
|
|
UBI: number of good PEBs: 8
|
|
UBI: number of bad PEBs: 0
|
|
UBI: max. allowed volumes: 128
|
|
UBI: wear-leveling threshold: 4096
|
|
UBI: number of internal volumes: 1
|
|
UBI: number of user volumes: 1
|
|
UBI: available PEBs: 0
|
|
UBI: total number of reserved PEBs: 8
|
|
UBI: number of PEBs reserved for bad PEB handling: 0
|
|
UBI: max/mean erase counter: 2/1
|
|
|
|
|
|
Now that the UBI device is attached, this device can be modified
|
|
using the following commands:
|
|
|
|
ubi info Display volume and ubi layout information
|
|
ubi createvol Create UBI volume on UBI device
|
|
ubi removevol Remove UBI volume from UBI device
|
|
ubi read Read data from UBI volume to memory
|
|
ubi write Write data from memory to UBI volume
|
|
|
|
|
|
Here a few examples on the usage:
|
|
|
|
=> ubi create testvol
|
|
Creating dynamic volume testvol of size 1048064
|
|
|
|
=> ubi info l
|
|
UBI: volume information dump:
|
|
UBI: vol_id 0
|
|
UBI: reserved_pebs 4
|
|
UBI: alignment 1
|
|
UBI: data_pad 0
|
|
UBI: vol_type 3
|
|
UBI: name_len 7
|
|
UBI: usable_leb_size 262016
|
|
UBI: used_ebs 4
|
|
UBI: used_bytes 1048064
|
|
UBI: last_eb_bytes 262016
|
|
UBI: corrupted 0
|
|
UBI: upd_marker 0
|
|
UBI: name testvol
|
|
|
|
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 262016
|
|
UBI: used_ebs 2
|
|
UBI: used_bytes 524032
|
|
UBI: last_eb_bytes 2
|
|
UBI: corrupted 0
|
|
UBI: upd_marker 0
|
|
UBI: name layout volume
|
|
|
|
=> ubi info
|
|
UBI: MTD device name: "mtd=2"
|
|
UBI: MTD device size: 2 MiB
|
|
UBI: physical eraseblock size: 262144 bytes (256 KiB)
|
|
UBI: logical eraseblock size: 262016 bytes
|
|
UBI: number of good PEBs: 8
|
|
UBI: number of bad PEBs: 0
|
|
UBI: smallest flash I/O unit: 1
|
|
UBI: VID header offset: 64 (aligned 64)
|
|
UBI: data offset: 128
|
|
UBI: max. allowed volumes: 128
|
|
UBI: wear-leveling threshold: 4096
|
|
UBI: number of internal volumes: 1
|
|
UBI: number of user volumes: 1
|
|
UBI: available PEBs: 0
|
|
UBI: total number of reserved PEBs: 8
|
|
UBI: number of PEBs reserved for bad PEB handling: 0
|
|
UBI: max/mean erase counter: 4/1
|
|
|
|
=> ubi write 800000 testvol 80000
|
|
Volume "testvol" found at volume id 0
|
|
|
|
=> ubi read 900000 testvol 80000
|
|
Volume testvol found at volume id 0
|
|
read 524288 bytes from volume 0 to 900000(buf address)
|
|
|
|
=> cmp.b 800000 900000 80000
|
|
Total of 524288 bytes were the same
|
|
|
|
|
|
Next, the ubifsmount command allows you to access filesystems on the
|
|
UBI partition which has been attached with the ubi part command:
|
|
|
|
=> help ubifsmount
|
|
ubifsmount - mount UBIFS volume
|
|
|
|
Usage:
|
|
ubifsmount <volume-name>
|
|
- mount 'volume-name' volume
|
|
|
|
For example:
|
|
|
|
=> ubifsmount ubi0:recovery
|
|
UBIFS: mounted UBI device 0, volume 0, name "recovery"
|
|
UBIFS: mounted read-only
|
|
UBIFS: file system size: 46473216 bytes (45384 KiB, 44 MiB, 366 LEBs)
|
|
UBIFS: journal size: 6348800 bytes (6200 KiB, 6 MiB, 50 LEBs)
|
|
UBIFS: media format: w4/r0 (latest is w4/r0)
|
|
UBIFS: default compressor: LZO
|
|
UBIFS: reserved for root: 0 bytes (0 KiB)
|
|
|
|
Note that unlike Linux, U-Boot can only have one active UBI partition
|
|
at a time, which can be referred to as ubi0, and must be supplied along
|
|
with the name of the filesystem you are mounting.
|
|
|
|
|
|
Once a UBI filesystem has been mounted, the ubifsls command allows you
|
|
to list the contents of a directory in the filesystem:
|
|
|
|
|
|
=> help ubifsls
|
|
ubifsls - list files in a directory
|
|
|
|
Usage:
|
|
ubifsls [directory]
|
|
- list files in a 'directory' (default '/')
|
|
|
|
For example:
|
|
|
|
=> ubifsls
|
|
17442 Thu Jan 01 02:57:38 1970 imx28-evk.dtb
|
|
2998146 Thu Jan 01 02:57:43 1970 zImage
|
|
|
|
|
|
And the ubifsload command allows you to load a file from a UBI
|
|
filesystem:
|
|
|
|
|
|
=> help ubifsload
|
|
ubifsload - load file from an UBIFS filesystem
|
|
|
|
Usage:
|
|
ubifsload <addr> <filename> [bytes]
|
|
- load file 'filename' to address 'addr'
|
|
|
|
For example:
|
|
|
|
=> ubifsload ${loadaddr} zImage
|
|
Loading file 'zImage' to addr 0x42000000 with size 2998146 (0x002dbf82)...
|
|
Done
|
|
|
|
|
|
Finally, you can unmount the UBI filesystem with the ubifsumount
|
|
command:
|
|
|
|
=> help ubifsumount
|
|
ubifsumount - unmount UBIFS volume
|
|
|
|
Usage:
|
|
ubifsumount - unmount current volume
|
|
|
|
For example:
|
|
|
|
=> ubifsumount
|
|
Unmounting UBIFS volume recovery!
|