cramfsswap(1) User Manuals cramfsswap(1)NAME
cramfsswap - swap endianess of a cram filesystem (cramfs)
SYNOPSIS
cramfsswap <infile> <outfile>
DESCRIPTION
cramfs is a highly compressed and size optimized linux filesystem which is mainly used for embedded applications. the problem with cramfs
is that it is endianess sensitive, meaning you can't mount a cramfs for a big endian target on a little endian machine and vice versa. this
is often especially a problem in the development phase.
cramfsswap solves that problem by allowing you to swap to endianess of a cramfs filesystem.
AUTHOR
Michael Holzt <kju@debian.org>
VERSION
20050104
Linux 4 Jan 2005 cramfsswap(1)
Check Out this Related Man Page
MKFS.CRAMFS(8) System Administration MKFS.CRAMFS(8)NAME
mkfs.cramfs - make compressed ROM file system
SYNOPSIS
mkfs.cramfs [options] directory file
DESCRIPTION
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; random write access for compressed files is difficult to implement.
cramfs ships with a utility (mkcramfs) to pack files into new cramfs images.
File sizes are limited to less than 16 MB.
Maximum file system size is a little under 272 MB. (The last file on the file system must begin before the 256 MB block, but can extend
past it.)
ARGUMENTS
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.
OPTIONS -v Enable verbose messaging.
-E Treat all warnings as errors, which are reflected as command return value.
-b blocksize
Use defined block size, which has to be divisible by page size.
-e edition
Use defined file system edition number in superblock.
-N big, little, host
Use defined endianness. Value defaults to host.
-i file
Insert a file to cramfs file system.
-n name
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 entry sorting.
-z Make explicit holes.
-h, --help
Display help text and exit.
-V, --version
Display version information and exit.
EXIT STATUS
0 success
8 operation error, such as unable to allocate memory
SEE ALSO fsck.cramfs(8), mount(8)AVAILABILITY
The example command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
/util-linux/>.
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