cramfs文件的解压

1. $ cramfsck -x <dir_name> root_china.cramfs

 

2. mount

To mount a CRAMFS image on a Linux workstation, you will need kernel support for the CRAMFS filesystem (CONFIG_CRAMFS; File systems -> Compressed ROM file system support) and loopback block devices (CONFIG_BLK_DEVICE_LOOP; Block devices -> loopback device support) . The kernels for ADS embedded systems have CRAMFS support built-in; if you wish to avoid compiling a kernel, you can perform this process on your ADS board instead of a Linux PC.

To mount a CRAMFS image, use the command:

   mount -o loop -t cramfs image_file  /mount/point

Use 'tar' to copy the CRAMFS filesystem to a temporary directory:

   cd /mount/point
   tar -cf  -  . | tar -C /temporary/dir  -xpf  -

You will need to be 'root' to copy the files without losing the proper permissions.