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TOMOYO Linux Cross Reference
Linux/fs/cramfs/Kconfig

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  1 # SPDX-License-Identifier: GPL-2.0-only
  2 config CRAMFS
  3         tristate "Compressed ROM file system support (cramfs)"
  4         select ZLIB_INFLATE
  5         help
  6           Saying Y here includes support for CramFs (Compressed ROM File
  7           System).  CramFs is designed to be a simple, small, and compressed
  8           file system for ROM based embedded systems.  CramFs is read-only,
  9           limited to 256MB file systems (with 16MB files), and doesn't support
 10           16/32 bits uid/gid, hard links and timestamps.
 11 
 12           See <file:Documentation/filesystems/cramfs.rst> and
 13           <file:fs/cramfs/README> for further information.
 14 
 15           To compile this as a module, choose M here: the module will be called
 16           cramfs.  Note that the root file system (the one containing the
 17           directory /) cannot be compiled as a module.
 18 
 19           This filesystem is limited in capabilities and performance on
 20           purpose to remain small and low on RAM usage. It is most suitable
 21           for small embedded systems. If you have ample RAM to spare, you may
 22           consider a more capable compressed filesystem such as SquashFS
 23           which is much better in terms of performance and features.
 24 
 25           If unsure, say N.
 26 
 27 config CRAMFS_BLOCKDEV
 28         bool "Support CramFs image over a regular block device" if EXPERT
 29         depends on CRAMFS && BLOCK
 30         default y
 31         help
 32           This option allows the CramFs driver to load data from a regular
 33           block device such a disk partition or a ramdisk.
 34 
 35 config CRAMFS_MTD
 36         bool "Support CramFs image directly mapped in physical memory"
 37         depends on CRAMFS && CRAMFS <= MTD
 38         default y if !CRAMFS_BLOCKDEV
 39         help
 40           This option allows the CramFs driver to load data directly from
 41           a linear addressed memory range (usually non-volatile memory
 42           like flash) instead of going through the block device layer.
 43           This saves some memory since no intermediate buffering is
 44           necessary.
 45 
 46           The location of the CramFs image is determined by a
 47           MTD device capable of direct memory mapping e.g. from
 48           the 'physmap' map driver or a resulting MTD partition.
 49           For example, this would mount the cramfs image stored in
 50           the MTD partition named "xip_fs" on the /mnt mountpoint:
 51 
 52           mount -t cramfs mtd:xip_fs /mnt
 53 
 54           If unsure, say N.

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