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- config CRAMFS
- tristate "Compressed ROM file system support (cramfs)"
- select ZLIB_INFLATE
- help
- Saying Y here includes support for CramFs (Compressed ROM File
- System). CramFs is designed to be a simple, small, and compressed
- file system for ROM based embedded systems. CramFs is read-only,
- limited to 256MB file systems (with 16MB files), and doesn't support
- 16/32 bits uid/gid, hard links and timestamps.
- See <file:Documentation/filesystems/cramfs.txt> and
- <file:fs/cramfs/README> for further information.
- To compile this as a module, choose M here: the module will be called
- cramfs. Note that the root file system (the one containing the
- directory /) cannot be compiled as a module.
- This filesystem is limited in capabilities and performance on
- purpose to remain small and low on RAM usage. It is most suitable
- for small embedded systems. If you have ample RAM to spare, you may
- consider a more capable compressed filesystem such as SquashFS
- which is much better in terms of performance and features.
- If unsure, say N.
- config CRAMFS_BLOCKDEV
- bool "Support CramFs image over a regular block device" if EXPERT
- depends on CRAMFS && BLOCK
- default y
- help
- This option allows the CramFs driver to load data from a regular
- block device such a disk partition or a ramdisk.
- config CRAMFS_MTD
- bool "Support CramFs image directly mapped in physical memory"
- depends on CRAMFS && CRAMFS <= MTD
- default y if !CRAMFS_BLOCKDEV
- help
- This option allows the CramFs driver to load data directly from
- a linear adressed memory range (usually non volatile memory
- like flash) instead of going through the block device layer.
- This saves some memory since no intermediate buffering is
- necessary.
- The location of the CramFs image is determined by a
- MTD device capable of direct memory mapping e.g. from
- the 'physmap' map driver or a resulting MTD partition.
- For example, this would mount the cramfs image stored in
- the MTD partition named "xip_fs" on the /mnt mountpoint:
- mount -t cramfs mtd:xip_fs /mnt
- If unsure, say N.
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