avionic design with actual uboot and tooling
submodule of avionic design uboot bootloader and with included tools to get you started , read readme.md and readme-tk1-loader.md
This commit is contained in:
225
u-boot/doc/README.ubi
Normal file
225
u-boot/doc/README.ubi
Normal file
@@ -0,0 +1,225 @@
|
||||
-------------------
|
||||
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 write.part address volume size [fullsize]
|
||||
- Write part of a volume from address
|
||||
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
|
||||
ubi write.part Write data from memory to UBI volume, in parts
|
||||
|
||||
|
||||
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!
|
||||
Reference in New Issue
Block a user