1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "ROM file system support"
4 depends on BLOCK || MTD
6 This is a very small read-only file system mainly intended for
7 initial ram disks of installation disks, but it could be used for
8 other read-only media as well. Read
9 <file:Documentation/filesystems/romfs.txt> for details.
11 To compile this file system support as a module, choose M here: the
12 module will be called romfs. Note that the file system of your
13 root partition (the one containing the directory /) cannot be a
16 If you don't know whether you need it, then you don't need it:
20 # Select the backing stores to be supported
23 prompt "RomFS backing stores"
25 default ROMFS_BACKED_BY_BLOCK
27 Select the backing stores to be supported.
29 config ROMFS_BACKED_BY_BLOCK
30 bool "Block device-backed ROM file system support"
33 This permits ROMFS to use block devices buffered through the page
34 cache as the medium from which to retrieve data. It does not allow
35 direct mapping of the medium.
39 config ROMFS_BACKED_BY_MTD
40 bool "MTD-backed ROM file system support"
41 depends on MTD=y || (ROMFS_FS=m && MTD)
43 This permits ROMFS to use MTD based devices directly, without the
44 intercession of the block layer (which may have been disabled). It
45 also allows direct mapping of MTD devices through romfs files under
46 NOMMU conditions if the underlying device is directly addressable by
51 config ROMFS_BACKED_BY_BOTH
53 depends on BLOCK && (MTD=y || (ROMFS_FS=m && MTD))
59 default y if ROMFS_BACKED_BY_BLOCK || ROMFS_BACKED_BY_BOTH
63 default y if ROMFS_BACKED_BY_MTD || ROMFS_BACKED_BY_BOTH