【转】U-Boot中ubi和ubifs命令的使用

最新推荐文章于 2021-04-30 03:42:44 发布

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本文介绍如何使用 U-Boot 对 MTD 设备进行分区管理，包括设置分区表、激活分区、挂载及查看分区内容等关键步骤。

原文地址：http://www.usr.cc/article-873.html

（1）查看MTD分区表`U-Boot$ mtdparts mtdparts variable not set, see 'help mtdparts' no partitions defined defaults: mtdids : nand0=nandflash0 mtdparts: mtdparts=nandflash0:1536k(bootloder),512k(params),4m(kernel),16m(safefs),-(rootfs)`

（2）载入默认分区表

U-Boot$ mtdparts default

（3）激活分区

U-Boot$ ubi part safefs
Creating 1 MTD partitions on "nand0": 0x000000600000-0x000001600000 : "mtd=3" device_name0:mtd=3 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 scanning error 0 UBI: attached mtd1 to ubi0 UBI: MTD device name: "mtd=3" UBI: MTD device size: 16 MiB UBI: number of good PEBs: 127 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: 1 UBI: available PEBs: 0 UBI: total number of reserved PEBs: 127 UBI: number of PEBs reserved for bad PEB handling: 2 UBI: max/mean erase counter: 4/1

查看当前激活的分区： U-Boot$ ubi part Device 0: nand0, partition safefs

（4）挂载分区

U-Boot$ ubifsmount safefs
UBIFS: recovery needed UBIFS: recovery deferred UBIFS: mounted UBI device 0, volume 0, name "safefs" UBIFS: mounted read-only UBIFS: file system size: 14192640 bytes (13860 KiB, 13 MiB, 110 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)

（5）查看分区的内容

U-Boot$ ubifsls
<DIR> 3840 Tue Apr 20 07:42:09 2010 bin <DIR> 480 Fri Aug 28 02:32:54 2009 dev <DIR> 2416 Thu Jan 01 00:18:47 1970 etc <DIR> 5464 Tue Apr 20 07:54:28 2010 lib <DIR> 480 Tue Apr 20 07:42:01 2010 mnt <DIR> 160 Fri Aug 28 01:37:57 2009 opt <DIR> 224 Tue Apr 20 09:19:29 2010 tmp <DIR> 160 Fri Aug 28 01:37:57 2009 sys <DIR> 736 Thu Feb 26 07:25:19 2009 var <DIR> 608 Fri Aug 28 02:32:54 2009 usr <DIR> 296 Fri Aug 28 01:37:57 2009 boot <DIR> 224 Tue Apr 20 07:42:01 2010 home <DIR> 160 Fri Aug 28 01:37:57 2009 proc <DIR> 2528 Tue Sep 14 08:50:07 2010 sbin <DIR> 160 Fri Aug 28 01:37:57 2009 root <LNK> 11 Tue Sep 14 08:24:07 2010 linuxrc 706 Wed Sep 15 08:47:30 2010 burn.usb 52 Wed Jun 30 06:30:21 2010 readme 697 Wed Sep 15 08:47:43 2010 burn.cf 664 Wed Sep 15 08:47:17 2010 burn.sd

（6）查看某个文件

U-Boot$ ubifsload 80008000 readme
Loading file 'readme' to addr 0x80008000 with size 52 (0x00000034)... Done

U-Boot$ md 80008000

80008000: 65666173 66207366 6120726f 4c206c6c safefs for all L 80008010: 32334350 42203035 6472616f 200a2e73 PC3250 Boards.. 80008020: 20202020 32202020 2d303130 302d3730 2010-07-0 80008030: 0a0a0a31 00000000 00000000 00000000 1...............