S3C6410使用---30让ubifs作rootfs

                  by wangcong02345

                               欢迎转载,但请注明出处

                               http://blog.chinaunix.net/blog/post/id/3862627.html

一.mtd-utils编译过程
下载:
sun@ubuntu:/work/6410/tools$ git clone git://git.infradead.org/mtd-utils.git
修改Makefile
sun@ubuntu:/work/6410/tools/mtd-utils$ vi common.mk 
  1 CROSS=arm-none-linux-gnueabi-                               ;指定交叉编译器
 25 PREFIX=/tmp/mtd
1.第一次编译

1. sun@ubuntu:/work/6410/tools/mtd-utils$ make
   
2.   CHK include/version.h
   
3.   LD ftl_format
   
4.   CC flash_erase.o
   
5.   LD flash_erase
   
6.   CC nanddump.o
   
7.   LD nanddump
   
8.   CC doc_loadbios.o
   
9.   LD doc_loadbios
   
10.   CC ftl_check.o
    
11.   LD ftl_check
    
12.   CC mkfs.jffs2.o
    
13. mkfs.jffs2.c:70:21:error: sys/acl.h: No such file or directory
    
14. mkfs.jffs2.c:Infunction'formalize_posix_acl':
    
15. mkfs.jffs2.c:1024:error:'ACL_USER_OBJ' undeclared (first use in this function)
    
16. mkfs.jffs2.c:1024:error:(Each undeclared identifier is reported only once
    
17. mkfs.jffs2.c:1024:error:foreachfunction it appears in.)
    
18. mkfs.jffs2.c:1025:error:'ACL_GROUP_OBJ' undeclared (first use in this function)
    
19. mkfs.jffs2.c:1026:error:'ACL_MASK' undeclared (first use in this function)
    
20. mkfs.jffs2.c:1027:error:'ACL_OTHER' undeclared (first use in this function)
    
21. mkfs.jffs2.c:1033:error:'ACL_USER' undeclared (first use in this function)
    
22. mkfs.jffs2.c:1034:error:'ACL_GROUP' undeclared (first use in this function)
    
23. make:***[/work/6410/tools/mtd-utils/arm-none-linux-gnueabi/mkfs.jffs2.o]Error 1

原因:  编译时调用acl.h了而没有调用zlib库
解决方法:指定WITHOUT_XATTR=1 指定编译时要调用zlib库

2.第二次编译

1. sun@ubuntu:/work/6410/tools/mtd-utils$ make WITHOUT_XATTR=1
   
2.   CHK include/version.h
   
3.   CC mkfs.jffs2.o
   
4.   CC compr_rtime.o
   
5.   CC compr_zlib.o
   
6.   CC compr_lzo.o
   
7. compr_lzo.c:31:23:error: lzo/lzo1x.h: No such file or directory
   
8. compr_lzo.c:Infunction'jffs2_lzo_cmpr':
   
9. compr_lzo.c:53:error:'lzo_uint' undeclared (first use in this function)
   
10. compr_lzo.c:53:error:(Each undeclared identifier is reported only once
    
11. compr_lzo.c:53:error:foreachfunction it appears in.)
    
12. compr_lzo.c:53:error: expected ';' before 'compress_size'
    
13. compr_lzo.c:56: warning: implicit declaration of function'lzo1x_999_compress'
    
14. compr_lzo.c:56:error:'compress_size' undeclared (first use in this function)
    
15. compr_lzo.c:58:error:'LZO_E_OK' undeclared (first use in this function)
    
16. compr_lzo.c:Infunction'jffs2_lzo_decompress':
    
17. compr_lzo.c:74:error:'lzo_uint' undeclared (first use in this function)
    
18. compr_lzo.c:74:error: expected ';' before 'dl'
    
19. compr_lzo.c:76: warning: implicit declaration of function'lzo1x_decompress_safe'
    
20. compr_lzo.c:76:error:'dl' undeclared (first use in this function)
    
21. compr_lzo.c:78:error:'LZO_E_OK' undeclared (first use in this function)
    
22. compr_lzo.c:Infunction'jffs2_lzo_init':
    
23. compr_lzo.c:97:error:'LZO1X_999_MEM_COMPRESS' undeclared (first use in this function)
    
24. make:***[/work/6410/tools/mtd-utils/arm-none-linux-gnueabi/compr_lzo.o]Error 1

原因: 没有lzo库
解决方法:编译lzo库,并添加到交叉编译工具链中

1. sun@ubuntu:/work/6410/tools/mtd-utils$ cd ..
   
2. sun@ubuntu:/work/6410/tools$ wget http://www.oberhumer.com/opensource/lzo/download/lzo-2.06.tar.gz   //下载lzo库
   
3. sun@ubuntu:/work/6410/tools$ ls
   
4. lzo-2.06.tar.gz mtd-utils
5. //下面的config指定交叉编译器
   
6. sun@ubuntu:/work/6410/tools/lzo-2.06$ CC=arm-none-linux-gnueabi-gcc ./configure --host=arm-linux --prefix=/opt/6410/4.3.2/arm-none-linux-gnueabi/
7. //编译
8. sun@ubuntu:/work/6410/tools/lzo-2.06$ make && make install
   
9. //确认在工具链目录中是否己经有头文件了
   
10. sun@ubuntu:/work/6410/tools/lzo-2.06$ find /opt/6410/4.3.2/-name "lzo1x.h"
    
11. /opt/6410/4.3.2/arm-none-linux-gnueabi/include/lzo/lzo1x.h

3.第三次编译

1. sun@ubuntu:/work/6410/tools/mtd-utils$ make WITHOUT_XATTR=1
   
2.   CHK include/version.h
   
3.   LD mkfs.jffs2
   
4. /opt/6410/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -lz
   
5. collect2: ld returned 1 exit status
   
6. make:***[/work/6410/tools/mtd-utils/arm-none-linux-gnueabi/mkfs.jffs2]Error 1

原因: 没有libz库
解决方法:编译libz库,并添加到交叉编译工具链中

1. sun@ubuntu:/work/6410/tools$ wget http://zlib.net/zlib-1.2.8.tar.gz   //下载lzo库
   
2. sun@ubuntu:/work/6410/tools$ ls
   
3. lzo-2.06 lzo-2.06.tar.gz lzo-2.06.tar.gz.1 mtd-utils zlib-1.2.8.tar.gz
   
4. sun@ubuntu:/work/6410/tools$ tar xf zlib-1.2.8.tar.gz 
   
5. sun@ubuntu:/work/6410/tools$ cd zlib-1.2.8/
6. //下面的config指定交叉编译器
   
7. sun@ubuntu:/work/6410/tools/zlib-1.2.8$ CC=arm-none-linux-gnueabi-gcc ./configure --shared --prefix=/opt/6410/4.3.2/arm-none-linux-gnueabi/
   
8. //编译并安装到工具链目录中
   
9. sun@ubuntu:/work/6410/tools/zlib-1.2.8$ make && make install
10. //确认在工具链目录中是否己经有库了
11. sun@ubuntu:/work/6410/tools/zlib-1.2.8$ find /opt/6410/4.3.2/arm-none-linux-gnueabi/-name "libz*"
    
12. /opt/6410/4.3.2/arm-none-linux-gnueabi/lib/libz.a
    
13. /opt/6410/4.3.2/arm-none-linux-gnueabi/lib/libz.so.1
    
14. /opt/6410/4.3.2/arm-none-linux-gnueabi/lib/libz.so.1.2.8
    
15. /opt/6410/4.3.2/arm-none-linux-gnueabi/lib/libz.so
    
16. /opt/6410/4.3.2/arm-none-linux-gnueabi/libc/armv4t/lib/libz.a

4.第四次编译

1. sun@ubuntu:/work/6410/tools/mtd-utils$ make WITHOUT_XATTR=1
   
2. In file included from mkfs.ubifs/mkfs.ubifs.c:26:
   
3. mkfs.ubifs/mkfs.ubifs.h:46:23:error: uuid/uuid.h: No such file or directory
   
4. mkfs.ubifs/mkfs.ubifs.c:Infunction'write_data':
   
5. mkfs.ubifs/mkfs.ubifs.c:1621: warning: implicit declaration of function'time'
   
6. mkfs.ubifs/mkfs.ubifs.c:Infunction'write_super':
   
7. mkfs.ubifs/mkfs.ubifs.c:1934: warning: implicit declaration of function'uuid_generate_random'
   
8. mkfs.ubifs/mkfs.ubifs.c:1938: warning: implicit declaration of function'uuid_unparse_upper'
   
9. make:***[/work/6410/tools/mtd-utils/arm-none-linux-gnueabi/mkfs.ubifs/mkfs.ubifs.o]Error 1

原因: 找不到头文件uuid
解决方法:

1. sun@ubuntu:/opt/6410/4.3.2$ grep "uuid_generate_random"*-R 
   
2.       arm-none-linux-gnueabi/libc/usr/include/uuid.h:void uuid_generate_random(uuid_t out);
   
3. //搜索发现uuid.h是在include目录下而不是在uuid这个目录下,所以只需要改一下路径就可以了
   
4. sun@ubuntu:/work/6410/tools/mtd-utils$ vi mkfs.ubifs/mkfs.ubifs.h
   
5.  46 //#include <uuid/uuid.h>
   
6.  47 #include <uuid.h>

5.第五次编译

1. sun@ubuntu:/work/6410/tools/mtd-utils$ make WITHOUT_XATTR=1
   
2.   CHK include/version.h
   
3.   CC mkfs.ubifs/mkfs.ubifs.o
   
4.   CC mkfs.ubifs/crc16.o
   
5.   CC mkfs.ubifs/lpt.o
   
6.   CC mkfs.ubifs/compr.o
   
7.   CC mkfs.ubifs/devtable.o
   
8.   CC mkfs.ubifs/hashtable/hashtable.o
   
9.   CC mkfs.ubifs/hashtable/hashtable_itr.o
   
10.   CC ubi-utils/libubi.o
    
11.   AR ubi-utils/libubi.a
    
12.   LD mkfs.ubifs/mkfs.ubifs
    
13. /opt/6410/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -luuid
    
14. collect2: ld returned 1 exit status

原因: 找不到库libuuid
解决方法:

1. sun@ubuntu:/opt/6410/4.3.2$ find .-name "libuuid*"
   
2. ./arm-none-linux-gnueabi/libc/armv4t/usr/lib/libuuid.so.1
   
3. ./arm-none-linux-gnueabi/libc/armv4t/usr/lib/libuuid.so
   
4. ./arm-none-linux-gnueabi/libc/armv4t/usr/lib/libuuid.so.1.2
   
5. //搜索发现libuuid是在libc/armv4t/usr/lib目录下,arm-none-linux-gnueabi-ld找不到,所以加个软链接
   
6. sun@ubuntu:/opt/6410/4.3.2/arm-none-linux-gnueabi/lib$ ln -s ../libc/armv4t/usr/lib/libuuid.so ./libuuid.so

6.第六次编译
OK,可以了,这样就有了一大串命令

1. sun@ubuntu:/work/6410/tools/mtd-utils$ ls /tmp/mtd/sbin/
   
2. docfdisk flash_eraseall flash_otp_lock ftl_format mkfs.ubifs nandtest recv_image sumtool ubiformat ubirename
   
3. doc_loadbios flash_lock flash_otp_write jffs2dump mtd_debug nandwrite rfddump ubiattach ubimkvol ubirmvol
   
4. flashcp flash_otp_dump flash_unlock jffs2reader mtdinfo nftldump rfdformat ubicrc32 ubinfo ubirsvol
   
5. flash_erase flash_otp_info ftl_check mkfs.jffs2 nanddump nftl_format serve_image ubidetach ubinize ubiupdatevol

二. linux中ubifs的使用
在 NFS 启动系统 时 将编译好的mtd-util复制到nfs系统中的/sbin/目录
1. 重新编译内核添加ubi与ubifs的支持

1. Device Drivers --->
   
2.  <*> Memory Technology Device (MTD) support --->
   
3.      <*> Enable UBI - Unsorted block images --->     
   
4.     
   
5. File systems --->    
   
6.  [*] Miscellaneous filesystems --->
   
7.      <*> UBIFS file system support

2. 查看分区信息

1. root@OK6410:~# mtdinfo -u
   
2. Count of MTD devices: 3
   
3. Present MTD devices: mtd0, mtd1, mtd2
   
4. Sysfs interface supported: yes

或者

1. root@OK6410:~# cat /proc/mtd
   
2. dev: size erasesize name
   
3. mtd0: 00100000 00080000 "Bootloader"
   
4. mtd1: 00500000 00080000 "Kernel"
   
5. mtd2: 7fa00000 00080000 "File System"
   
6. root@OK6410:~# mtdinfo /dev/mtd0
   
7. mtd0
   
8. Name: Bootloader
   
9. Type: nand
   
10. Eraseblock size: 524288 bytes, 512.0 KiB
    
11. Amount of eraseblocks: 2 (1048576 bytes, 1024.0 KiB)
    
12. Minimum input/output unit size: 4096 bytes
    
13. Sub-page size: 4096 bytes
    
14. OOB size: 218 bytes
    
15. Character device major/minor: 90:0
    
16. Bad blocks are allowed:true
    
17. Device is writable:false

3. 将文件系统格式化为ubifs
ubiformat: a tool to format MTD devices and flash UBI images

1. root@OK6410:~# ubiformat /dev/mtd2
   
2. ubiformat: mtd2 (nand), size 2141192192 bytes (2.0 GiB), 4084 eraseblocks of 524288 bytes (512.0 KiB), min. I/O size 4096 bytes
   
3. libscan: scanning eraseblock 4083 -- 100 % complete 
   
4. ubiformat: 4070 eraseblocks are supposedly empty
   
5. ubiformat: 2 bad eraseblocks found, numbers: 3, 121
   
6. ubiformat: 12 of 4082 eraseblocks contain non-ubifs data
   
7. ubiformat: continue?(y/N) y
   
8. ubiformat: only 0 of 4082 eraseblocks have valid erase counter
   
9. ubiformat:erase counter 0 will be used for all eraseblocks
   
10. ubiformat: note, arbitrary erase counter value may be specified using -e option
    
11. ubiformat: continue?(y/N) y
    
12. ubiformat: use erase counter 0 for all eraseblocks
    
13. ubiformat: formatting eraseblock 4083 -- 100 % complete

4. 将文件系统与ubi_ctrl相关联

1. root@OK6410:~# ubiattach /dev/ubi_ctrl -m 2
   
2. UBI: attaching mtd2 to ubi0
   
3. UBI: physical eraseblock size: 524288 bytes (512 KiB)
   
4. UBI: logical eraseblock size: 516096 bytes
   
5. UBI: smallest flash I/O unit: 4096
   
6. UBI: VID header offset: 4096 (aligned 4096)
   
7. UBI: data offset: 8192
   
8. UBI: max. sequence number: 0
   
9. UBI: attached mtd2 to ubi0
   
10. UBI: MTD device name:"File System"
    
11. UBI: MTD device size: 2042 MiB
    
12. UBI: number of good PEBs: 4082
    
13. UBI: number of bad PEBs: 2
    
14. UBI: number of corrupted PEBs: 0
    
15. UBI: max. allowed volumes: 128
    
16. UBI: wear-leveling threshold: 4096
    
17. UBI: number of internal volumes: 1
    
18. UBI: number of user volumes: 0
    
19. UBI: available PEBs: 4038
    
20. UBI: total number of reserved PEBs: 44
    
21. UBI: number of PEBs reserved for bad PEB handling: 40
    
22. UBI: max/mean erase counter: 0/0
    
23. UBI: image sequence number: 557638241
    
24. UBI: background thread "ubi_bgt0d" started, PID 96
    
25. UBI device number 0, total 4082 LEBs (2106703872 bytes, 2.0 GiB), available 4038 LEBs (2083995648 bytes, 1.9 GiB), LEB size 516096 bytes (504.0 KiB)

查看ubi信息

1. root@OK6410:~# ubinfo -a
   
2. UBI version: 1
   
3. Count of UBI devices: 1
   
4. UBI control device major/minor: 10:63
   
5. Present UBI devices: ubi0
6. ubi0
   
7. Volumes count: 0
   
8. Logical eraseblock size: 516096 bytes, 504.0 KiB
   
9. Total amount of logical eraseblocks: 4082 (2106703872 bytes, 2.0 GiB)
   
10. Amount of available logical eraseblocks: 4038 (2083995648 bytes, 1.9 GiB)
    
11. Maximum count of volumes 128
    
12. Count of bad physical eraseblocks: 2
    
13. Count of reserved physical eraseblocks: 40
    
14. Current maximum erase counter value: 0
    
15. Minimum input/output unit size: 4096 bytes
    
16. Character device major/minor: 252:0

5. 创建volume

1. root@OK6410:~# ubimkvol /dev/ubi0 -N ubifs -m
   
2. Set volume size to 2083995648
   
3. Volume ID 0, size 4038 LEBs (2083995648 bytes, 1.9 GiB), LEB size 516096 bytes (504.0 KiB), dynamic, name "ubifs", alignment 1
   
4. root@OK6410:~# ubinfo -a
   
5. UBI version: 1
   
6. Count of UBI devices: 1
   
7. UBI control device major/minor: 10:63
   
8. Present UBI devices: ubi0
   
9. ubi0
   
10. Volumes count: 1
    
11. Logical eraseblock size: 516096 bytes, 504.0 KiB
    
12. Total amount of logical eraseblocks: 4082 (2106703872 bytes, 2.0 GiB)
    
13. Amount of available logical eraseblocks: 0 (0 bytes)
    
14. Maximum count of volumes 128
    
15. Count of bad physical eraseblocks: 2
    
16. Count of reserved physical eraseblocks: 40
    
17. Current maximum erase counter value: 1
    
18. Minimum input/output unit size: 4096 bytes
    
19. Character device major/minor: 252:0
    
20. Present volumes: 0
    
21. Volume ID: 0 (on ubi0)
    
22. Type: dynamic
    
23. Alignment: 1
    
24. Size: 4038 LEBs (2083995648 bytes, 1.9 GiB)
    
25. State: OK
    
26. Name: ubifs
    
27. Character device major/minor: 252:1
    
28. root@OK6410:~# mount -t ubifs ubi0_0 /mnt/ubi/
    
29. UBIFS: default file-system created
    
30. UBIFS: mounted UBI device 0, volume 0, name "ubifs"
    
31. UBIFS: file system size: 2078834688 bytes (2030112 KiB, 1982 MiB, 4028 LEBs)
    
32. UBIFS: journal size: 33546240 bytes (32760 KiB, 31 MiB, 65 LEBs)
    
33. UBIFS: media format: w4/r0 (latest is w4/r0)
    
34. UBIFS: default compressor: lzo
    
35. UBIFS: reserved for root: 4952683 bytes (4836 KiB)

6. 挂载ubifs

1. //创建挂载目录
   
2. root@OK6410:~# mkdir -p /mnt/ubi
   
3. //挂载
   
4. root@OK6410:~# mount -t ubifs ubi0_0 /mnt/ubi/
   
5. UBIFS: default file-system created
   
6. UBIFS: mounted UBI device 0, volume 0, name "ubifs"
   
7. UBIFS: file system size: 2078834688 bytes (2030112 KiB, 1982 MiB, 4028 LEBs)
   
8. UBIFS: journal size: 33546240 bytes (32760 KiB, 31 MiB, 65 LEBs)
   
9. UBIFS: media format: w4/r0 (latest is w4/r0)
   
10. UBIFS: default compressor: lzo
    
11. UBIFS: reserved for root: 4952683 bytes (4836 KiB)
    
12. 
    
13. //查看
    
14. root@OK6410:~# df -h
    
15. Filesystem Size Used Available Use% Mounted on
    
16. 192.168.6.220:/work/6410/yaffs2/
    
17.                         147.6G 93.4G 46.8G 67%/
    
18. tmpfs 37.8M 0 37.8M 0%/dev/shm
    
19. ubi0_0 1.8G 28.0K 1.8G 0%/mnt/ubi

三. 在PC上制作ubifs镜像
1. 编译mtd-util的pc版
需要先安装uuid-dev,要不会报以下错误:

1. sun@ubuntu:/work/6410/pctools/mtd-utils$ make WITHOUT_XATTR=1
2. In file included from mkfs.ubifs/mkfs.ubifs.c:26:0:
   
3. mkfs.ubifs/mkfs.ubifs.h:47:18: fatal error: uuid.h: No such file or directory
   
4. compilation terminated.
   
5. make:***[/work/6410/pctools/mtd-utils/mkfs.ubifs/mkfs.ubifs.o]Error 1
   
6. 
   
7. sun@ubuntu:/work/6410/pctools/mtd-utils$ sudo apt-get install uuid-dev

2.在PC机上制作ubi的镜像

1. sun@ubuntu:/work/6410/test$ sudo /tmp/mtdpc/sbin/mkfs.ubifs -r rootfs -m 4096 -e 516096 -c 4038 -o ubifs.img
   
2. sun@ubuntu:/work/6410/test$ sudo /tmp/mtdpc/sbin/ubinize -o ubi.img -m 4096 -s 4096 -p 512KiB ubifs.conf

参数解析:
-r：制定文件内容的位置                    /work/6410/test/rootfs目录下
-m：页面大小                                 4096
-e：逻辑擦除块大小                         516096:Logical eraseblock size: 516096 bytes--> ubinfo -a
-p：物理擦除块大小                         512K, 这个参数是datasheet中一个block的大小
-c：最大的逻辑擦除块数量                4038:  Amount of available logical eraseblocks --> ubinfo -a
-s：最小的硬件输入输出页面大小，    Minimum input/output unit size: 4096 bytes

四. 在6410上烧写ubifs镜像,并启动
1. 在6410中将ubi.img写入到nand flash上去
a.查看文件系统的路径,注意这儿是nfs启动的

1. root@OK6410:~# cat /proc/mtd
   
2. dev: size erasesize name
   
3. mtd0: 00100000 00080000 "Bootloader"
   
4. mtd1: 00500000 00080000 "Kernel"
   
5. mtd2: 7fa00000 00080000 "File System"

b.格式化为ubifs
从上面可以看出mtd2是nand flash的文件系统,所以要将mtd2格式化成ubifs

1. root@OK6410:/work# ubiformat /dev/mtd2 -s 4096 -f /work/ubi.img

这儿用到了ubiformat的-f指令:把ubifs的镜像文件/work/ubi.img烧到/dev/mtd2中
c.下面检查一下是否挂载成功

    root@OK6410 : / work# ubiattach  / dev / ubi_ctrl  - m 2

1. root@OK6410:/work# mount -t ubifs ubi0:ubifs /mnt/ubi/
   
2. UBIFS: mounted UBI device 0, volume 0, name "ubifs"
   
3. UBIFS: file system size: 2078834688 bytes (2030112 KiB, 1982 MiB, 4028 LEBs)
   
4. UBIFS: journal size: 10452992 bytes (10208 KiB, 9 MiB, 21 LEBs)
   
5. UBIFS: media format: w4/r0 (latest is w4/r0)
   
6. UBIFS: default compressor: lzo
   
7. UBIFS: reserved for root: 0 bytes (0 KiB)

特别注意: ubi0 : ubifs 中后面这个ubifs是分区name,可以在ubimkvol中设定,我这儿设定的name=ubifs 
ubimkvol  / dev / ubi0  - N ubifs  - m
d. 设定u-boot中的bootargs

1. setenv bootargs "console=ttySAC0,115200 ubi.mtd=2 root=ubi0:ubifs rootfstype=ubifs"

注意:  我试过下面这个就是多加了init=linuxrc

1. setenv bootargs "console=ttySAC0,115200 ubi.mtd=2 root=ubi0:ubifs rootfstype=ubifs init=/linuxrc"

但是出现下面这个错误,所以不用加init=/linuxrc

1. VFS: Unable to mount root fs via NFS, trying floppy.
   
2. Kernel panic -not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
   
3. [<c003acac>](unwind_backtrace+0x0/0xfc) from [<c0494430>](dump_stack+0x18/0x1c)
   
4. [<c0494430>](dump_stack+0x18/0x1c) from [<c0494494>](panic+0x60/0x1ac)
   
5. [<c0494494>](panic+0x60/0x1ac) from [<c0008fb4>](mount_block_root+0x1bc/0x25c)
   
6. [<c0008fb4>](mount_block_root+0x1bc/0x25c) from [<c00090dc>](mount_root+0x88/0xd0)
   
7. [<c00090dc>](mount_root+0x88/0xd0) from [<c0009230>](prepare_namespace+0x10c/0x1a8)
   
8. [<c0009230>](prepare_namespace+0x10c/0x1a8) from [<c00084c4>](kernel_init+0xf0/0x130)
   
9. [<c00084c4>](kernel_init+0xf0/0x130) from [<c0035a34>](kernel_thread_exit+0x0/0x8

下面是成功的mount

1. root@OK6410:~# mount
   
2. rootfs on/ type rootfs (rw)
   
3. ubi0:ubifs on/ type ubifs (rw,relatime)