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- # SPDX-License-Identifier: GPL-2.0-only
- config ROMFS_FS
- tristate "ROM file system support"
- depends on BLOCK || MTD
- help
- This is a very small read-only file system mainly intended for
- initial ram disks of installation disks, but it could be used for
- other read-only media as well. Read
- <file:Documentation/filesystems/romfs.rst> for details.
- To compile this file system support as a module, choose M here: the
- module will be called romfs. Note that the file system of your
- root partition (the one containing the directory /) cannot be a
- module.
- If you don't know whether you need it, then you don't need it:
- answer N.
- #
- # Select the backing stores to be supported
- #
- choice
- prompt "RomFS backing stores"
- depends on ROMFS_FS
- default ROMFS_BACKED_BY_BLOCK
- help
- Select the backing stores to be supported.
- config ROMFS_BACKED_BY_BLOCK
- bool "Block device-backed ROM file system support"
- depends on BLOCK
- help
- This permits ROMFS to use block devices buffered through the page
- cache as the medium from which to retrieve data. It does not allow
- direct mapping of the medium.
- If unsure, answer Y.
- config ROMFS_BACKED_BY_MTD
- bool "MTD-backed ROM file system support"
- depends on MTD=y || (ROMFS_FS=m && MTD)
- help
- This permits ROMFS to use MTD based devices directly, without the
- intercession of the block layer (which may have been disabled). It
- also allows direct mapping of MTD devices through romfs files under
- NOMMU conditions if the underlying device is directly addressable by
- the CPU.
- If unsure, answer Y.
- config ROMFS_BACKED_BY_BOTH
- bool "Both the above"
- depends on BLOCK && (MTD=y || (ROMFS_FS=m && MTD))
- endchoice
- config ROMFS_ON_BLOCK
- bool
- default y if ROMFS_BACKED_BY_BLOCK || ROMFS_BACKED_BY_BOTH
- config ROMFS_ON_MTD
- bool
- default y if ROMFS_BACKED_BY_MTD || ROMFS_BACKED_BY_BOTH
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