Root/fs/romfs/Kconfig

1config ROMFS_FS
2    tristate "ROM file system support"
3    depends on BLOCK || MTD
4    ---help---
5      This is a very small read-only file system mainly intended for
6      initial ram disks of installation disks, but it could be used for
7      other read-only media as well. Read
8      <file:Documentation/filesystems/romfs.txt> for details.
9
10      To compile this file system support as a module, choose M here: the
11      module will be called romfs. Note that the file system of your
12      root partition (the one containing the directory /) cannot be a
13      module.
14
15      If you don't know whether you need it, then you don't need it:
16      answer N.
17
18#
19# Select the backing stores to be supported
20#
21choice
22    prompt "RomFS backing stores"
23    depends on ROMFS_FS
24    default ROMFS_BACKED_BY_BLOCK
25    help
26      Select the backing stores to be supported.
27
28config ROMFS_BACKED_BY_BLOCK
29    bool "Block device-backed ROM file system support"
30    depends on BLOCK
31    help
32      This permits ROMFS to use block devices buffered through the page
33      cache as the medium from which to retrieve data. It does not allow
34      direct mapping of the medium.
35
36      If unsure, answer Y.
37
38config ROMFS_BACKED_BY_MTD
39    bool "MTD-backed ROM file system support"
40    depends on MTD=y || (ROMFS_FS=m && MTD)
41    help
42      This permits ROMFS to use MTD based devices directly, without the
43      intercession of the block layer (which may have been disabled). It
44      also allows direct mapping of MTD devices through romfs files under
45      NOMMU conditions if the underlying device is directly addressable by
46      the CPU.
47
48      If unsure, answer Y.
49
50config ROMFS_BACKED_BY_BOTH
51    bool "Both the above"
52    depends on BLOCK && (MTD=y || (ROMFS_FS=m && MTD))
53endchoice
54
55
56config ROMFS_ON_BLOCK
57    bool
58    default y if ROMFS_BACKED_BY_BLOCK || ROMFS_BACKED_BY_BOTH
59
60config ROMFS_ON_MTD
61    bool
62    default y if ROMFS_BACKED_BY_MTD || ROMFS_BACKED_BY_BOTH
63

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