UBIFS

From ArmadeusWiki
Revision as of 13:17, 15 November 2009 by JulienB (Talk | contribs) (beautifying)

Jump to: navigation, search

Page under construction... Construction.png 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
  • Buildroot (APF27):
target filesystem -> ubifs root filesystem: (PEB=0x20000, LEB=0x1F800, minIO=0x800, SUBPAGESIZE=512, MAXLEB=2047)
  • Buildroot (APF9328):
target filesystem -> ubifs root filesystem (PEB=0x20000, LEB=0x1FF80, minIO=0x1, SUBPAGESIZE=0, MAXLEB=255)
  • Linux:
file systems -> Miscellanous -> ubifs support   and disable debugging !!
device driver -> mtd -> ubi unsorted block image -> Enable UBI (4096) and disable debugging !!
  • U-Boot:
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.