Commit | Line | Data |
---|---|---|
2a22783b | 1 | config CRAMFS |
8d59598c | 2 | tristate "Compressed ROM file system support (cramfs)" |
2a22783b AD |
3 | select ZLIB_INFLATE |
4 | help | |
5 | Saying Y here includes support for CramFs (Compressed ROM File | |
6 | System). CramFs is designed to be a simple, small, and compressed | |
7 | file system for ROM based embedded systems. CramFs is read-only, | |
8 | limited to 256MB file systems (with 16MB files), and doesn't support | |
9 | 16/32 bits uid/gid, hard links and timestamps. | |
10 | ||
11 | See <file:Documentation/filesystems/cramfs.txt> and | |
12 | <file:fs/cramfs/README> for further information. | |
13 | ||
14 | To compile this as a module, choose M here: the module will be called | |
15 | cramfs. Note that the root file system (the one containing the | |
16 | directory /) cannot be compiled as a module. | |
17 | ||
8d59598c NP |
18 | This filesystem is limited in capabilities and performance on |
19 | purpose to remain small and low on RAM usage. It is most suitable | |
20 | for small embedded systems. If you have ample RAM to spare, you may | |
21 | consider a more capable compressed filesystem such as SquashFS | |
22 | which is much better in terms of performance and features. | |
54886a71 | 23 | |
2a22783b | 24 | If unsure, say N. |
99c18ce5 NP |
25 | |
26 | config CRAMFS_BLOCKDEV | |
27 | bool "Support CramFs image over a regular block device" if EXPERT | |
28 | depends on CRAMFS && BLOCK | |
29 | default y | |
30 | help | |
31 | This option allows the CramFs driver to load data from a regular | |
32 | block device such a disk partition or a ramdisk. | |
33 | ||
34 | config CRAMFS_MTD | |
35 | bool "Support CramFs image directly mapped in physical memory" | |
a8c6db00 | 36 | depends on CRAMFS && CRAMFS <= MTD |
99c18ce5 NP |
37 | default y if !CRAMFS_BLOCKDEV |
38 | help | |
39 | This option allows the CramFs driver to load data directly from | |
40 | a linear adressed memory range (usually non volatile memory | |
41 | like flash) instead of going through the block device layer. | |
42 | This saves some memory since no intermediate buffering is | |
43 | necessary. | |
44 | ||
45 | The location of the CramFs image is determined by a | |
46 | MTD device capable of direct memory mapping e.g. from | |
47 | the 'physmap' map driver or a resulting MTD partition. | |
48 | For example, this would mount the cramfs image stored in | |
49 | the MTD partition named "xip_fs" on the /mnt mountpoint: | |
50 | ||
51 | mount -t cramfs mtd:xip_fs /mnt | |
52 | ||
53 | If unsure, say N. |