U-Boot中ubi和ubifs命令的使用

（1）查看MTD分区表


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1. U-Boot$ mtdparts
2. mtdparts variable not set, see 'help mtdparts'
   
3. no partitions defined
5. defaults:
6. mtdids : nand0=nandflash0
7. 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

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1. Creating 1 MTD partitions on "nand0":
   
2. 0x000000600000-0x000001600000 : "mtd=3"
   
3. device_name0:mtd=3
4. UBI: attaching mtd1 to ubi0
5. UBI: physical eraseblock size: 131072 bytes (128 KiB)
6. UBI: logical eraseblock size: 129024 bytes
7. UBI: smallest flash I/O unit: 2048
8. UBI: sub-page size: 512
9. UBI: VID header offset: 512 (aligned 512)
10. UBI: data offset: 2048
11. scanning error 0
12. UBI: attached mtd1 to ubi0
13. UBI: MTD device name: "mtd=3"
    
14. UBI: MTD device size: 16 MiB
15. UBI: number of good PEBs: 127
16. UBI: number of bad PEBs: 1
17. UBI: max. allowed volumes: 128
18. UBI: wear-leveling threshold: 4096
19. UBI: number of internal volumes: 1
20. UBI: number of user volumes: 1
21. UBI: available PEBs: 0
22. UBI: total number of reserved PEBs: 127
23. UBI: number of PEBs reserved for bad PEB handling: 2
    
24. UBI: max/mean erase counter: 4/1

查看当前激活的分区：
U-Boot$ ubi part


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1. Device 0: nand0, partition safefs

（4）挂载分区

U-Boot$ ubifsmount safefs

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1. UBIFS: recovery needed
2. UBIFS: recovery deferred
3. UBIFS: mounted UBI device 0, volume 0, name "safefs"
   
4. UBIFS: mounted read-only
5. UBIFS: file system size: 14192640 bytes (13860 KiB, 13 MiB, 110 LEBs)
   
6. UBIFS: journal size: 9033728 bytes (8822 KiB, 8 MiB, 71 LEBs)
7. UBIFS: media format: w4/r0 (latest is w4/r0)
8. UBIFS: default compressor: LZO
   
9. UBIFS: reserved for root: 0 bytes (0 KiB)
   

（5）查看分区的内容

U-Boot$ ubifsls

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

（6）查看某个文件

U-Boot$ ubifsload 80008000 readme

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1. Loading file 'readme' to addr 0x80008000 with size 52 (0x00000034)...
   
2. Done

U-Boot$ md 80008000

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1. 80008000: 65666173 66207366 6120726f 4c206c6c safefs 
   for all L
2. 80008010: 32334350 42203035 6472616f 200a2e73 PC3250 Boards..
3. 80008020: 20202020 32202020 2d303130 302d3730 2010-07-0
4. 80008030: 0a0a0a31 00000000 00000000 00000000 1...............

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