141810246SAlexey Dobriyanconfig ROMFS_FS 241810246SAlexey Dobriyan tristate "ROM file system support" 3f52fd5b7SDavid Howells depends on BLOCK || MTD 441810246SAlexey Dobriyan ---help--- 541810246SAlexey Dobriyan This is a very small read-only file system mainly intended for 641810246SAlexey Dobriyan initial ram disks of installation disks, but it could be used for 741810246SAlexey Dobriyan other read-only media as well. Read 841810246SAlexey Dobriyan <file:Documentation/filesystems/romfs.txt> for details. 941810246SAlexey Dobriyan 1041810246SAlexey Dobriyan To compile this file system support as a module, choose M here: the 1141810246SAlexey Dobriyan module will be called romfs. Note that the file system of your 1241810246SAlexey Dobriyan root partition (the one containing the directory /) cannot be a 1341810246SAlexey Dobriyan module. 1441810246SAlexey Dobriyan 1541810246SAlexey Dobriyan If you don't know whether you need it, then you don't need it: 1641810246SAlexey Dobriyan answer N. 17da4458bdSDavid Howells 18f52fd5b7SDavid Howells# 19f52fd5b7SDavid Howells# Select the backing stores to be supported 20f52fd5b7SDavid Howells# 21f52fd5b7SDavid Howellschoice 22f52fd5b7SDavid Howells prompt "RomFS backing stores" 23f52fd5b7SDavid Howells depends on ROMFS_FS 24f52fd5b7SDavid Howells default ROMFS_BACKED_BY_BLOCK 25f52fd5b7SDavid Howells help 26f52fd5b7SDavid Howells Select the backing stores to be supported. 27f52fd5b7SDavid Howells 28f52fd5b7SDavid Howellsconfig ROMFS_BACKED_BY_BLOCK 29f52fd5b7SDavid Howells bool "Block device-backed ROM file system support" 30f52fd5b7SDavid Howells depends on BLOCK 31da4458bdSDavid Howells help 32da4458bdSDavid Howells This permits ROMFS to use block devices buffered through the page 33da4458bdSDavid Howells cache as the medium from which to retrieve data. It does not allow 34da4458bdSDavid Howells direct mapping of the medium. 35da4458bdSDavid Howells 36da4458bdSDavid Howells If unsure, answer Y. 37da4458bdSDavid Howells 38f52fd5b7SDavid Howellsconfig ROMFS_BACKED_BY_MTD 39da4458bdSDavid Howells bool "MTD-backed ROM file system support" 40da4458bdSDavid Howells depends on MTD=y || (ROMFS_FS=m && MTD) 41da4458bdSDavid Howells help 42da4458bdSDavid Howells This permits ROMFS to use MTD based devices directly, without the 43da4458bdSDavid Howells intercession of the block layer (which may have been disabled). It 44da4458bdSDavid Howells also allows direct mapping of MTD devices through romfs files under 45da4458bdSDavid Howells NOMMU conditions if the underlying device is directly addressable by 46da4458bdSDavid Howells the CPU. 47da4458bdSDavid Howells 48da4458bdSDavid Howells If unsure, answer Y. 49da4458bdSDavid Howells 50f52fd5b7SDavid Howellsconfig ROMFS_BACKED_BY_BOTH 51f52fd5b7SDavid Howells bool "Both the above" 52f52fd5b7SDavid Howells depends on BLOCK && (MTD=y || (ROMFS_FS=m && MTD)) 53f52fd5b7SDavid Howellsendchoice 54f52fd5b7SDavid Howells 55f52fd5b7SDavid Howells 56f52fd5b7SDavid Howellsconfig ROMFS_ON_BLOCK 57f52fd5b7SDavid Howells bool 58f52fd5b7SDavid Howells default y if ROMFS_BACKED_BY_BLOCK || ROMFS_BACKED_BY_BOTH 59f52fd5b7SDavid Howells 60f52fd5b7SDavid Howellsconfig ROMFS_ON_MTD 61f52fd5b7SDavid Howells bool 62f52fd5b7SDavid Howells default y if ROMFS_BACKED_BY_MTD || ROMFS_BACKED_BY_BOTH 63