UBIFS

UBIFS

UBIFS works with NOR and NAND flash. Please refer to the doc on the MTD community to enable UBI driver support and UBIFS filesystem support in kernel config.

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

In the Linux configuration menu, go to "Device Drivers" -> "Memory Technology Devices (MTD)" -> "UBI - Unsorted block images", and mark the "Enable UBI" check-box.

Then in the Linux configuration menu, go to "File systems" ->

"Miscellaneous filesystems", and mark the

"UBIFS file system support" check-box.

Next in the User apps configuration menu, go to "Flash Tools" ---> [*] "mtd-utils" --> [*] " ubifs utilities" .

You will need to add the ubi devices nodes to romfs_list (NOMMU) or device_table.txt (MMU) or use mdev.

crw-rw---- 1 root root 253, 0 Mar 1 11:09 ubi0

crw-rw---- 1 root root 10, 63 Mar 1 11:09 ubi_ctrl

Below is the boot message of UBIFS on a 512MB NAND flash using the nand flash interface described in the nioswiki MTD page.

Kernel command line: ubi.mtd=0

ttyJ0 at MMIO 0x9003250 (irq = 1) is a Altera JTAG UART

console [ttyJ0] enabled, bootconsole disabled

NAND device: Manufacturer ID: 0xec, Chip ID: 0xdc (Samsung NAND 512MiB 3,3V 8-bit)

Scanning device for bad blocks

Bad eraseblock 711 at 0x00000b1c0000

UBI: attaching mtd0 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: attached mtd0 to ubi0

UBI: MTD device name: "gen_nand"

UBI: MTD device size: 512 MiB

UBI: number of good PEBs: 2047

UBI: number of bad PEBs: 1

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: 2023

UBI: total number of reserved PEBs: 24

UBI: number of PEBs reserved for bad PEB handling: 20

UBI: max/mean erase counter: 1/1

UBI: image sequence number: 0

UBI: background thread "ubi_bgt0d" started, PID 567

root:/> ubimkvol /dev/ubi0 -m -N data

Set volume size to 522031104

Volume ID 0, size 2023 LEBs (522031104 bytes, 497.8 MiB), LEB size 258048 bytes (252.0 KiB), dynamic, name "data", alignment 1

root:/> mkdir /mnt/data

root:/> mount -t ubifs ubi0_0 /mnt/data

UBIFS: default file-system created

UBIFS: mounted UBI device 0, volume 0, name "data"

UBIFS: file system size: 519450624 bytes (507276 KiB, 495 MiB, 2013 LEBs)

UBIFS: journal size: 26062848 bytes (25452 KiB, 24 MiB, 101 LEBs)

UBIFS: media format: w4/r0 (latest is w4/r0)

UBIFS: default compressor: lzo

UBIFS: reserved for root: 4952683 bytes (4836 KiB)

root:/> df

Filesystem 1K-blocks Used Available Use% Mounted on

ubi0_0 475696 20 470840 0% /mnt/data

root:/> umount /mnt/data

UBIFS: un-mount UBI device 0, volume 0