本文主要是介绍mtd----------嵌入式-------------------，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
http://blog.sina.com.cn/s/blog_5d9051c00100ek1j.html
NAND是嵌入式系统一个很重要的部件，而mtd-utilts中包含了很多针对NAND的调试和测试的工具。
1. 在http://git.infradead.org/mtd-utils.git上下载最新的mtd-utils代码, 下面是以2009-07-03的代码为例。
2. 解压缩mtd-utils.tgz
3. cd mtd-utils,编辑common.mk: 增加CROSS=arm-linux-
4. 执行make即可。
在mtd-utils中生成的主要工具有：
（1） flash_eraseall, 用于擦除指定的MTD分区， 用法如下：
./flash_eraseall /dev/mtd1 擦除MTD1
./flash_eraseall -j /dev/mtd1 擦除MTD1并将其格式化为JFFS2
（2） nanddump, 打印（或保存）NAND中的内容，用法如下：
./nanddump -s 0 -l 8024 -f result.dat /dev/mtd1 将mtd1中从地址0开始的8024长度的内容保存到result.dat中，(缺省的，包含OOB的内容)
注意，用vi或vim查看result.dat的内容时是2进制，在命令模式下，输入%!xxd即可转换为十六进制的可读内容。
（3） 其他的还有nandwrite, nandtest等。
在mtd-utils/ubi-utils中生成的工具是针对UBIFS的，包含：
（1）mtdinfo: 输出指定的mtd分区的信息, 该命令只对可读的设备分区有效。
用法： ./mtdinfo /dev/mtd1
（2）ubinfo: 输出指定的ubi设备的信息，不带参数时，输出系统所有的ubi设备以及ubi控制设备信息。ubi控制设备即/dev/ubi_ctrl是一个字符设备，在后面还将用到。
用法：./ubinfo
./ubinfo /dev/ubi0
（3）ubiformat:格式化指定的mtd分区, 参数使用的是mtd的字符设备
用法：./ubiformat /dev/mtd1
（4）ubiattach:将指定的mtd分区关联到ubi上
用法：./ubiattach /dev/ubi_ctrl -m 1， 将mtd1关连ubi
（5）ubidetach:解除mtd与ubi的关联
用法：./ubidetach /dev/ubi_ctrl -m 1
（6）ubimkvol:创建一个voluem，volume才是最终用户挂载文件系统的地方。
用法：在ubi2上创建4个olume，每个大小是20M, 名字分别为my_vol_a, my_vol_b, my_vol_c, my_vol_d.
./ubimkvol /dev/ubi2 -s 20Mib -N my_vol_a
./ubimkvol /dev/ubi2 -s 20Mib -N my_vol_b
./ubimkvol /dev/ubi2 -s 20Mib -N my_vol_c
./ubimkvol /dev/ubi2 -s 20Mib -N my_vol_d
（7）ubirename: 更改ubi某个olume的名字，或者完成两个volume的互换
用法：
（1）将ubi2上名字为my_vol_a的volume名字改为my_vol_newname
./ubirename /dev/ubi2 my_vol_a my_vol_newname
（2）将ubi2上名字为my_vol_b和my_vol_c的两个volume互换,
./ubirename /dev/ubi2 my_vol_b my_vol_c my_vol_c my_vol_b
（8）ubirmvol: 删除某个volume，可以通过名字或id指定具体的volume
用法： ./ubirmvol /dev/ubi2 -n 1
或./ubirmvol /dev/ubi2 -N my_vol_d
（9）ubinize: 创建ubi image。
用法: ./ubinize -o myubi.img -p 126976 -m 2048 my.ini
其中， -p, 指定的是目标flash的physical eraseblock的大小
-s, 指定的是目标flash的minimum input/output unit 的大小， 这两个参数的值可以通过“cat /sys/class/ubi/ubi2/*”得到
my.ini是配置文件，其中指定了原文件，目标volume的大小、名字等。其格式如小：
[jffs2-volume]
mode=ubi
image=../jffs2.img
vol_id=1
vol_size=30MiB
vol_type=dynamic
vol_name=jffs2_volume
vol_flags=autoresize
vol_alignment=1
（10）ubiupdatevol: 向指定的volume上写数据
用法：./ubiupdatevol /dev/ubi2_0 myubi.img
-------------------------------------------------------------------------------------------
OKC6410使用---30让ubifs作rootfs 2013-08-23 12:29:35
分类： LINUX
by wangcong02345
欢迎转载,但请注明出处
http://blog.chinaunix.net/blog/post/id/3862627.html
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
- sun@ubuntu:/work/6410/tools/mtd-utils$ make
- CHK include/version.h
- LD ftl_format
- CC flash_erase.o
- LD flash_erase
- CC nanddump.o
- LD nanddump
- CC doc_loadbios.o
- LD doc_loadbios
- CC ftl_check.o
- LD ftl_check
- CC mkfs.jffs2.o
- mkfs.jffs2.c:70:21: error: sys/acl.h: No such file or directory
- mkfs.jffs2.c: In function 'formalize_posix_acl':
- mkfs.jffs2.c:1024: error: 'ACL_USER_OBJ' undeclared (first use in this function)
- mkfs.jffs2.c:1024: error: (Each undeclared identifier is reported only once
- mkfs.jffs2.c:1024: error: for each function it appears in.)
- mkfs.jffs2.c:1025: error: 'ACL_GROUP_OBJ' undeclared (first use in this function)
- mkfs.jffs2.c:1026: error: 'ACL_MASK' undeclared (first use in this function)
- mkfs.jffs2.c:1027: error: 'ACL_OTHER' undeclared (first use in this function)
- mkfs.jffs2.c:1033: error: 'ACL_USER' undeclared (first use in this function)
- mkfs.jffs2.c:1034: error: 'ACL_GROUP' undeclared (first use in this function)
- make: *** [/work/6410/tools/mtd-utils/arm-none-linux-gnueabi/mkfs.jffs2.o] Error 1
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
- sun@ubuntu:/work/6410/tools/mtd-utils$ make WITHOUT_XATTR=1
- CHK include/version.h
- CC mkfs.jffs2.o
- CC compr_rtime.o
- CC compr_zlib.o
- CC compr_lzo.o
- compr_lzo.c:31:23: error: lzo/lzo1x.h: No such file or directory
- compr_lzo.c: In function 'jffs2_lzo_cmpr':
- compr_lzo.c:53: error: 'lzo_uint' undeclared (first use in this function)
- compr_lzo.c:53: error: (Each undeclared identifier is reported only once
- compr_lzo.c:53: error: for each function it appears in.)
- compr_lzo.c:53: error: expected ';' before 'compress_size'
- compr_lzo.c:56: warning: implicit declaration of function 'lzo1x_999_compress'
- compr_lzo.c:56: error: 'compress_size' undeclared (first use in this function)
- compr_lzo.c:58: error: 'LZO_E_OK' undeclared (first use in this function)
- compr_lzo.c: In function 'jffs2_lzo_decompress':
- compr_lzo.c:74: error: 'lzo_uint' undeclared (first use in this function)
- compr_lzo.c:74: error: expected ';' before 'dl'
- compr_lzo.c:76: warning: implicit declaration of function 'lzo1x_decompress_safe'
- compr_lzo.c:76: error: 'dl' undeclared (first use in this function)
- compr_lzo.c:78: error: 'LZO_E_OK' undeclared (first use in this function)
- compr_lzo.c: In function 'jffs2_lzo_init':
- compr_lzo.c:97: error: 'LZO1X_999_MEM_COMPRESS' undeclared (first use in this function)
- make: *** [/work/6410/tools/mtd-utils/arm-none-linux-gnueabi/compr_lzo.o] Error 1
解决方法:编译lzo库,并添加到交叉编译工具链中
- sun@ubuntu:/work/6410/tools/mtd-utils$ cd ..
- sun@ubuntu:/work/6410/tools$ wget http://www.oberhumer.com/opensource/lzo/download/lzo-2.06.tar.gz //下载lzo库
- sun@ubuntu:/work/6410/tools$ ls
- lzo-2.06.tar.gz mtd-utils
- //下面的config指定交叉编译器
- 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/
- //编译
- sun@ubuntu:/work/6410/tools/lzo-2.06$ make && make install
- //确认在工具链目录中是否己经有头文件了
- sun@ubuntu:/work/6410/tools/lzo-2.06$ find /opt/6410/4.3.2/ -name "lzo1x.h"
- /opt/6410/4.3.2/arm-none-linux-gnueabi/include/lzo/lzo1x.h
- sun@ubuntu:/work/6410/tools/mtd-utils$ make WITHOUT_XATTR=1
- CHK include/version.h
- LD mkfs.jffs2
- /opt/6410/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -lz
- collect2: ld returned 1 exit status
- make: *** [/work/6410/tools/mtd-utils/arm-none-linux-gnueabi/mkfs.jffs2] Error 1
解决方法:编译libz库,并添加到交叉编译工具链中
- sun@ubuntu:/work/6410/tools$ wget http://zlib.net/zlib-1.2.8.tar.gz //下载lzo库
- sun@ubuntu:/work/6410/tools$ ls
- lzo-2.06 lzo-2.06.tar.gz lzo-2.06.tar.gz.1 mtd-utils zlib-1.2.8.tar.gz
- sun@ubuntu:/work/6410/tools$ tar xf zlib-1.2.8.tar.gz
- sun@ubuntu:/work/6410/tools$ cd zlib-1.2.8/
- //下面的config指定交叉编译器
- 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/
- //编译并安装到工具链目录中
- sun@ubuntu:/work/6410/tools/zlib-1.2.8$ make && make install
- //确认在工具链目录中是否己经有库了
- sun@ubuntu:/work/6410/tools/zlib-1.2.8$ find /opt/6410/4.3.2/arm-none-linux-gnueabi/ -name "libz*"
- /opt/6410/4.3.2/arm-none-linux-gnueabi/lib/libz.a
- /opt/6410/4.3.2/arm-none-linux-gnueabi/lib/libz.so.1
- /opt/6410/4.3.2/arm-none-linux-gnueabi/lib/libz.so.1.2.8
- /opt/6410/4.3.2/arm-none-linux-gnueabi/lib/libz.so
- /opt/6410/4.3.2/arm-none-linux-gnueabi/libc/armv4t/lib/libz.a
- sun@ubuntu:/work/6410/tools/mtd-utils$ make WITHOUT_XATTR=1
- In file included from mkfs.ubifs/mkfs.ubifs.c:26:
- mkfs.ubifs/mkfs.ubifs.h:46:23: error: uuid/uuid.h: No such file or directory
- mkfs.ubifs/mkfs.ubifs.c: In function 'write_data':
- mkfs.ubifs/mkfs.ubifs.c:1621: warning: implicit declaration of function 'time'
- mkfs.ubifs/mkfs.ubifs.c: In function 'write_super':
- mkfs.ubifs/mkfs.ubifs.c:1934: warning: implicit declaration of function 'uuid_generate_random'
- mkfs.ubifs/mkfs.ubifs.c:1938: warning: implicit declaration of function 'uuid_unparse_upper'
- make: *** [/work/6410/tools/mtd-utils/arm-none-linux-gnueabi/mkfs.ubifs/mkfs.ubifs.o] Error 1
解决方法:
- sun@ubuntu:/opt/6410/4.3.2$ grep "uuid_generate_random" * -R
- arm-none-linux-gnueabi/libc/usr/include/uuid.h:void uuid_generate_random(uuid_t out);
- //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
- sun@ubuntu:/work/6410/tools/mtd-utils$ vi mkfs.ubifs/mkfs.ubifs.h
- 46 //#include <uuid/uuid.h>
- 47 #include <uuid.h>
- sun@ubuntu:/work/6410/tools/mtd-utils$ make WITHOUT_XATTR=1
- CHK include/version.h
- CC mkfs.ubifs/mkfs.ubifs.o
- CC mkfs.ubifs/crc16.o
- CC mkfs.ubifs/lpt.o
- CC mkfs.ubifs/compr.o
- CC mkfs.ubifs/devtable.o
- CC mkfs.ubifs/hashtable/hashtable.o
- CC mkfs.ubifs/hashtable/hashtable_itr.o
- CC ubi-utils/libubi.o
- AR ubi-utils/libubi.a
- LD mkfs.ubifs/mkfs.ubifs
- /opt/6410/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -luuid
- collect2: ld returned 1 exit status
解决方法:
- sun@ubuntu:/opt/6410/4.3.2$ find . -name "libuuid*"
- ./arm-none-linux-gnueabi/libc/armv4t/usr/lib/libuuid.so.1
- ./arm-none-linux-gnueabi/libc/armv4t/usr/lib/libuuid.so
- ./arm-none-linux-gnueabi/libc/armv4t/usr/lib/libuuid.so.1.2
- //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
- sun@ubuntu:/opt/6410/4.3.2/arm-none-linux-gnueabi/lib$ ln -s ../libc/armv4t/usr/lib/libuuid.so ./libuuid.so
OK,可以了,这样就有了一大串命令
- sun@ubuntu:/work/6410/tools/mtd-utils$ ls /tmp/mtd/sbin/
- docfdisk flash_eraseall flash_otp_lock ftl_format mkfs.ubifs nandtest recv_image sumtool ubiformat ubirename
- doc_loadbios flash_lock flash_otp_write jffs2dump mtd_debug nandwrite rfddump ubiattach ubimkvol ubirmvol
- flashcp flash_otp_dump flash_unlock jffs2reader mtdinfo nftldump rfdformat ubicrc32 ubinfo ubirsvol
- 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
- Device Drivers --->
- <*> Memory Technology Device (MTD) support --->
- <*> Enable UBI - Unsorted block images --->
-
- File systems --->
- [*] Miscellaneous filesystems --->
- <*> UBIFS file system support
- root@OK6410:~# mtdinfo -u
- Count of MTD devices: 3
- Present MTD devices: mtd0, mtd1, mtd2
- Sysfs interface supported: yes
- root@OK6410:~# cat /proc/mtd
- dev: size erasesize name
- mtd0: 00100000 00080000 "Bootloader"
- mtd1: 00500000 00080000 "Kernel"
- mtd2: 7fa00000 00080000 "File System"
- root@OK6410:~# mtdinfo /dev/mtd0
- mtd0
- Name: Bootloader
- Type: nand
- Eraseblock size: 524288 bytes, 512.0 KiB
- Amount of eraseblocks: 2 (1048576 bytes, 1024.0 KiB)
- Minimum input/output unit size: 4096 bytes
- Sub-page size: 4096 bytes
- OOB size: 218 bytes
- Character device major/minor: 90:0
- Bad blocks are allowed: true
- Device is writable: false
ubiformat: a tool to format MTD devices and flash UBI images
- root@OK6410:~# ubiformat /dev/mtd2
- ubiformat: mtd2 (nand), size 2141192192 bytes (2.0 GiB), 4084 eraseblocks of 524288 bytes (512.0 KiB), min. I/O size 4096 bytes
- libscan: scanning eraseblock 4083 -- 100 % complete
- ubiformat: 4070 eraseblocks are supposedly empty
- ubiformat: 2 bad eraseblocks found, numbers: 3, 121
- ubiformat: 12 of 4082 eraseblocks contain non-ubifs data
- ubiformat: continue? (y/N) y
- ubiformat: only 0 of 4082 eraseblocks have valid erase counter
- ubiformat: erase counter 0 will be used for all eraseblocks
- ubiformat: note, arbitrary erase counter value may be specified using -e option
- ubiformat: continue? (y/N) y
- ubiformat: use erase counter 0 for all eraseblocks
- ubiformat: formatting eraseblock 4083 -- 100 % complete
- root@OK6410:~# ubiattach /dev/ubi_ctrl -m 2
- UBI: attaching mtd2 to ubi0
- UBI: physical eraseblock size: 524288 bytes (512 KiB)
- UBI: logical eraseblock size: 516096 bytes
- UBI: smallest flash I/O unit: 4096
- UBI: VID header offset: 4096 (aligned 4096)
- UBI: data offset: 8192
- UBI: max. sequence number: 0
- UBI: attached mtd2 to ubi0
- UBI: MTD device name: "File System"
- UBI: MTD device size: 2042 MiB
- UBI: number of good PEBs: 4082
- UBI: number of bad PEBs: 2
- UBI: number of corrupted PEBs: 0
- UBI: max. allowed volumes: 128
- UBI: wear-leveling threshold: 4096
- UBI: number of internal volumes: 1
- UBI: number of user volumes: 0
- UBI: available PEBs: 4038
- UBI: total number of reserved PEBs: 44
- UBI: number of PEBs reserved for bad PEB handling: 40
- UBI: max/mean erase counter: 0/0
- UBI: image sequence number: 557638241
- UBI: background thread "ubi_bgt0d" started, PID 96
- 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)
- root@OK6410:~# ubinfo -a
- UBI version: 1
- Count of UBI devices: 1
- UBI control device major/minor: 10:63
- Present UBI devices: ubi0
- ubi0
- Volumes count: 0
- Logical eraseblock size: 516096 bytes, 504.0 KiB
- Total amount of logical eraseblocks: 4082 (2106703872 bytes, 2.0 GiB)
- Amount of available logical eraseblocks: 4038 (2083995648 bytes, 1.9 GiB)
- Maximum count of volumes 128
- Count of bad physical eraseblocks: 2
- Count of reserved physical eraseblocks: 40
- Current maximum erase counter value: 0
- Minimum input/output unit size: 4096 bytes
- Character device major/minor: 252:0
- root@OK6410:~# ubimkvol /dev/ubi0 -N ubifs -m
- Set volume size to 2083995648
- Volume ID 0, size 4038 LEBs (2083995648 bytes, 1.9 GiB), LEB size 516096 bytes (504.0 KiB), dynamic, name "ubifs", alignment 1
- root@OK6410:~# ubinfo -a
- UBI version: 1
- Count of UBI devices: 1
- UBI control device major/minor: 10:63
- Present UBI devices: ubi0
- ubi0
- Volumes count: 1
- Logical eraseblock size: 516096 bytes, 504.0 KiB
- Total amount of logical eraseblocks: 4082 (2106703872 bytes, 2.0 GiB)
- Amount of available logical eraseblocks: 0 (0 bytes)
- Maximum count of volumes 128
- Count of bad physical eraseblocks: 2
- Count of reserved physical eraseblocks: 40
- Current maximum erase counter value: 1
- Minimum input/output unit size: 4096 bytes
- Character device major/minor: 252:0
- Present volumes: 0
- Volume ID: 0 (on ubi0)
- Type: dynamic
- Alignment: 1
- Size: 4038 LEBs (2083995648 bytes, 1.9 GiB)
- State: OK
- Name: ubifs
- Character device major/minor: 252:1
- root@OK6410:~# mount -t ubifs ubi0_0 /mnt/ubi/
- UBIFS: default file-system created
- UBIFS: mounted UBI device 0, volume 0, name "ubifs"
- UBIFS: file system size: 2078834688 bytes (2030112 KiB, 1982 MiB, 4028 LEBs)
- UBIFS: journal size: 33546240 bytes (32760 KiB, 31 MiB, 65 LEBs)
- UBIFS: media format: w4/r0 (latest is w4/r0)
- UBIFS: default compressor: lzo
- UBIFS: reserved for root: 4952683 bytes (4836 KiB)
- //创建挂载目录
- root@OK6410:~# mkdir -p /mnt/ubi
- //挂载
- root@OK6410:~# mount -t ubifs ubi0_0 /mnt/ubi/
- UBIFS: default file-system created
- UBIFS: mounted UBI device 0, volume 0, name "ubifs"
- UBIFS: file system size: 2078834688 bytes (2030112 KiB, 1982 MiB, 4028 LEBs)
- UBIFS: journal size: 33546240 bytes (32760 KiB, 31 MiB, 65 LEBs)
- UBIFS: media format: w4/r0 (latest is w4/r0)
- UBIFS: default compressor: lzo
- UBIFS: reserved for root: 4952683 bytes (4836 KiB)
-
- //查看
- root@OK6410:~# df -h
- Filesystem Size Used Available Use% Mounted on
- 192.168.6.220:/work/6410/yaffs2/
- 147.6G 93.4G 46.8G 67% /
- tmpfs 37.8M 0 37.8M 0% /dev/shm
- ubi0_0 1.8G 28.0K 1.8G 0% /mnt/ubi
1. 编译mtd-util的pc版
需要先安装uuid-dev,要不会报以下错误:
- sun@ubuntu:/work/6410/pctools/mtd-utils$ make WITHOUT_XATTR=1
- In file included from mkfs.ubifs/mkfs.ubifs.c:26:0:
- mkfs.ubifs/mkfs.ubifs.h:47:18: fatal error: uuid.h: No such file or directory
- compilation terminated.
- make: *** [/work/6410/pctools/mtd-utils/mkfs.ubifs/mkfs.ubifs.o] Error 1
-
- sun@ubuntu:/work/6410/pctools/mtd-utils$ sudo apt-get install uuid-dev
- sun@ubuntu:/work/6410/test$ sudo /tmp/mtdpc/sbin/mkfs.ubifs -r rootfs -m 4096 -e 516096 -c 4038 -o ubifs.img
- sun@ubuntu:/work/6410/test$ sudo /tmp/mtdpc/sbin/ubinize -o ubi.img -m 4096 -s 4096 -p 512KiB ubifs.conf
-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
- root@OK6410:~# cat /proc/mtd
- dev: size erasesize name
- mtd0: 00100000 00080000 "Bootloader"
- mtd1: 00500000 00080000 "Kernel"
- mtd2: 7fa00000 00080000 "File System"
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
- root@OK6410:/work# ubiformat /dev/mtd2 -s 4096 -f /work/ubi.img
c.下面检查一下是否挂载成功
root@OK6410 : / work# ubiattach / dev / ubi_ctrl - m 2
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 - root@OK6410:/work# mount -t ubifs ubi0:ubifs /mnt/ubi/
- UBIFS: mounted UBI device 0, volume 0, name "ubifs"
- UBIFS: file system size: 2078834688 bytes (2030112 KiB, 1982 MiB, 4028 LEBs)
- UBIFS: journal size: 10452992 bytes (10208 KiB, 9 MiB, 21 LEBs)
- UBIFS: media format: w4/r0 (latest is w4/r0)
- UBIFS: default compressor: lzo
- UBIFS: reserved for root: 0 bytes (0 KiB)
ubimkvol /dev/ubi0 -N ubifs -m
d. 设定u-boot中的bootargs
- setenv bootargs "console=ttySAC0,115200 ubi.mtd=2 root=ubi0:ubifs rootfstype=ubifs"
- setenv bootargs "console=ttySAC0,115200 ubi.mtd=2 root=ubi0:ubifs rootfstype=ubifs init=/linuxrc"
- VFS: Unable to mount root fs via NFS, trying floppy.
- Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
- [<c003acac>] (unwind_backtrace+0x0/0xfc) from [<c0494430>] (dump_stack+0x18/0x1c)
- [<c0494430>] (dump_stack+0x18/0x1c) from [<c0494494>] (panic+0x60/0x1ac)
- [<c0494494>] (panic+0x60/0x1ac) from [<c0008fb4>] (mount_block_root+0x1bc/0x25c)
- [<c0008fb4>] (mount_block_root+0x1bc/0x25c) from [<c00090dc>] (mount_root+0x88/0xd0)
- [<c00090dc>] (mount_root+0x88/0xd0) from [<c0009230>] (prepare_namespace+0x10c/0x1a8)
- [<c0009230>] (prepare_namespace+0x10c/0x1a8) from [<c00084c4>] (kernel_init+0xf0/0x130)
- [<c00084c4>] (kernel_init+0xf0/0x130) from [<c0035a34>] (kernel_thread_exit+0x0/0x8
- root@OK6410:~# mount
- rootfs on / type rootfs (rw)
- ubi0:ubifs on / type ubifs (rw,relatime)
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