linux/fs/romfs/Kconfig
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   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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