UBIFS

转：http://www.armadeus.com/wiki/index.php?title=UBIFS

This is a preliminary page dealing with the installation of UBIFS on the APF boards. UBIFS will replace JFFS2 file system on NAND (and NOR as well) based boards because JFFS2 induces a big overhead when parsing, reading and writing large devices, see UBIFS scalability.

Contents

 [hide]

• 1 Introduction
• 2 Host Setup
• 3 APF build config
  • 3.1 Buildroot
  • 3.2 Linux
  • 3.3 U-Boot envt variables
• 4 Additional informations
  • 4.1 U-Boot access to UBIFS partitions

Introduction

UBIFS website

Host Setup

• add uuid-dev packages (should be already installed as required to build the HEAD of Armadeus repository):

$ sudo apt-get install uuid-dev

APF build config

Buildroot

$ make menuconfig

APF51:

Target filesystem options  --->
    [*] ubifs root filesystem
    (0x1f800) UBI logical erase block size
    (0x800) UBI minimum I/O size
    (2047) Maximum LEB count
          ubifs runtime compression (lzo)  --->
          Compression method (no compression)  --->
    [*]   UBI image
    (0x20000) UBI physical erase block size
    (512)   UBI sub-page size

APF27:

Target filesystem options  --->
    [*] ubifs root filesystem
    (0x20000) UBI physical erase block size
    (0x1f800) UBI logical erase block size
    (0x800) UBI minimum I/O size
    (512) UBI sub-page size
    (2047) Maximum LEB count

$ make

Linux

$ make linux-menuconfig

File systems  --->
    [*] Miscellaneous filesystems  --->
        <*>   UBIFS file system support   and disable debugging !!

Device Drivers  --->
    <*> Memory Technology Device (MTD) support  --->
        UBI - Unsorted block images  --->
            <*> Enable UBI
            (4096) UBI wear-leveling threshold  and disable debugging !!

$ make linux

• reflash your kernel

U-Boot envt variables

BIOS> setenv bootcmd run ubifsboot
BIOS> setenv download_rootfs tftpboot ${loadaddr} ${serverpath}${board_name}-rootfs.arm.ubi

Additional informations

A new file 'ubinize.cfg' defining the ubi volumes is located in buildroot/target/ubifs/. This file contains the different UBI volumes of the UBI image:

 [ubifs]
 mode=ubi
 vol_id=0
 vol_type=dynamic
 vol_name=rootfs
 vol_alignment=1
 vol_flags=autoresize

This file is processed by the ubinize utility after mkfs.ubifs.

U-Boot access to UBIFS partitions

U-Boot can read files from the rootfs / UBIFS partition using the commands: uni, ubifsmount, ubifsls, ubifsload. Here is an example applicable to the apf27, apf28 and apf51 boards:

 

BIOS> ubi part rootfs
UBI: attaching mtd1 to ubi0
UBI: physical eraseblock size:   131072 bytes (128 KiB)
UBI: logical eraseblock size:    129024 bytes
UBI: smallest flash I/O unit:    2048
UBI: sub-page size:              512
UBI: VID header offset:          512 (aligned 512)
UBI: data offset:                2048
UBI: attached mtd1 to ubi0
UBI: MTD device name:            "mtd=7"
UBI: MTD device size:            500 MiB
UBI: number of good PEBs:        3988
UBI: number of bad PEBs:         12
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: 3988
UBI: number of PEBs reserved for bad PEB handling: 39
UBI: max/mean erase counter: 2/0

BIOS> ubifsmount ubi0:rootfs
UBIFS: mounted UBI device 0, volume 0, name "rootfs"
UBIFS: mounted read-only
UBIFS: file system size:   504483840 bytes (492660 KiB, 481 MiB, 3910 LEBs)
UBIFS: journal size:       9033728 bytes (8822 KiB, 8 MiB, 71 LEBs)
UBIFS: media format:       w4/r0 (latest is w4/r0)
UBIFS: default compressor: LZO
UBIFS: reserved for root:  0 bytes (0 KiB)

BIOS> ubifsls /boot
	  2604048  Thu Oct 03 08:38:56 2013  apf51-linux.bin

BIOS> ubifsload 90000000 /boot/apf51-linux.bin
Loading file '/boot/apf51-linux.bin' to addr 0x90000000 with size 2604048 (0x0027bc10)...
Done

Acces to UBIFS files from U-Boot can used to do an update of your system after deployement on site through some U-Boot scripts..