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mkfs.cramfs [options] directory file
Files on cramfs file systems are zlib-compressed one page at a time to
allow random read access. The metadata is not compressed, but is
expressed in a terse representation that is more space-efficient than
conventional file systems.
The file system is intentionally read-only to simplify its design; ran-
dom write access for compressed files is difficult to implement.
cramfs ships with a utility (mkcramfs) to pack files into new cramfs
File sizes are limited to less than 16MB.
Maximum file system size is a little under 272MB. (The last file on
the file system must begin before the 256MB block, but can extend past
The directory is simply the root of the directory tree that we want to
generate a compressed filesystem out of.
The file will contain the cram file system, which later can be mounted.
-v Enable verbose messaging.
-E Treat all warnings as errors, which are reflected as command
Use defined block size, which has to be divisible by page size.
Use defined file system edition number in superblock.
-N big, little, host
Use defined endianness. Value defaults to host.
Insert a file to cramfs file system.
Set name of the cramfs file system.
-p Pad by 512 bytes for boot code.
-s This option is ignored. Originally the -s turned on directory
The example command is part of the util-linux package and is available
from Linux Kernel Archive
util-linux April 2013 EXAMPLE(8)