UBIFS

Page under construction... Informations on this page are not guaranteed !!

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 UBISFS scalability.

For the time being, this procedure can only be used with the APF27 board. Volunteers are welcome to investigate solutions to use UBIFS on the APF9328.

Introduction

UBIFS website

Setting up

Host system

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

$ sudo apt-get install uuid-dev

Build config

• Buildroot

$ make menuconfig

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

APF9328:

Target filesystem options  --->
    [*] ubifs root filesystem
    (0x20000) UBI physical erase block size
    (0x1ff80) UBI logical erase block size
    (0x1) UBI minimum I/O size
    (0) UBI sub-page size
    (255) Maximum LEB count

$ make

• Linux:

$ make linux26-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 linux26

• reflash your kernel

U-Boot parameters

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

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.