cramfs

1. Download the source code
   
2. Unzip the file :tar -zxvf cramfs-1.1.tar.gz
   
3. Enter the foler and make to build the source code.
   

   -rw-rw-r--  1 1045 1045   18009 2002-02-16 08:11 COPYING
   -rwxrwxr-x  1 root root   29714 2009-05-04 11:33 cramfsck
   -rw-rw-r--  1 1045 1045   18135 2002-02-23 08:00 cramfsck.c
   -rw-rw-r--  1 1045 1045     156 2002-02-23 08:52 GNUmakefile
   drwxrwxr-x  2 1045 1045    4096 2002-02-23 08:52 linux
   -rw-r--r--  1 root root       0 2009-05-04 14:19 list.txt
   -rwxrwxr-x  1 root root   32491 2009-05-04 11:33 mkcramfs
   -rw-rw-r--  1 1045 1045   25418 2002-02-20 16:03 mkcramfs.c
   -rw-rw-r--  1 1045 1045    6322 2002-02-23 08:00 NOTES
   -rw-rw-r--  1 1045 1045    2599 2002-02-16 09:06 README
   

4. After build, you can get the cramfsck and mkcramfs.
   
   cramfsck uses to unzip the cramfs type file, and mkcramfs uses to zip file into cramfs type.
   
   
5. cp cramfsck and mkcramfs to /bin.
   
6. cramfsck -x dir_name xxx.cramfs : Extract cramfs file into a directory.
   

   usage: cramfsck [-hv] [-x dir] file
   -h         print this help
   -x dir     extract into dir
   -v         be more verbose
   file       file to test
   

7. mkcramfs dir_name xxx.cramfs
   

   usage: mkcramfs [-h] [-e edition] [-i file] [-n name] dirname outfile
   -h         print this help
   -E         make all warnings errors (non-zero exit status)
   -e edition set edition number (part of fsid)
   -i file    insert a file image into the filesystem (requires >= 2.4.0)
   -n name    set name of cramfs filesystem
   -p         pad by 512 bytes for boot code
   -s         sort directory entries (old option, ignored)
   -v         be more verbose
   -z         make explicit holes (requires >= 2.3.39)
   dirname    root of the directory tree to be compressed
   outfile    output file    

8. mount cramfs file : mount -o loop xxx.cramfs dir_name
   
9. Reference
   
   1. Mount cramfs
      
   2. cramfs的特點
      
   3. cramfs根文件系統的使用
      
   4. sourceforge
      
   5. HOWTO: Create your custom firmware image
      
   6. cramfs + busybox 文件系統移植