target/linux/generic/files/fs/yaffs2/Kconfig

   1 #
   2 # yaffs file system configurations
   3 #
   4
   5 config YAFFS_FS
   6         tristate "yaffs2 file system support"
   7         default n
   8         depends on MTD_BLOCK
   9         select YAFFS_YAFFS1
  10         select YAFFS_YAFFS2
  11         help
  12           yaffs2, or Yet Another Flash File System, is a file system
  13           optimised for NAND Flash chips.
  14
  15           To compile the yaffs2 file system support as a module, choose M
  16           here: the module will be called yaffs2.
  17
  18           If unsure, say N.
  19
  20           Further information on yaffs2 is available at
  21           <http://www.aleph1.co.uk/yaffs/>.
  22
  23 config YAFFS_YAFFS1
  24         bool "512 byte / page devices"
  25         depends on YAFFS_FS
  26         default y
  27         help
  28           Enable yaffs1 support -- yaffs for 512 byte / page devices
  29
  30           Not needed for 2K-page devices.
  31
  32           If unsure, say Y.
  33
  34 config YAFFS_9BYTE_TAGS
  35         bool "Use older-style on-NAND data format with pageStatus byte"
  36         depends on YAFFS_YAFFS1
  37         default n
  38         help
  39
  40           Older-style on-NAND data format has a "pageStatus" byte to record
  41           chunk/page state.  This byte is zero when the page is discarded.
  42           Choose this option if you have existing on-NAND data using this
  43           format that you need to continue to support.  New data written
  44           also uses the older-style format.  Note: Use of this option
  45           generally requires that MTD's oob layout be adjusted to use the
  46           older-style format.  See notes on tags formats and MTD versions
  47           in yaffs_mtdif1.c.
  48
  49           If unsure, say N.
  50
  51 config YAFFS_DOES_ECC
  52         bool "Lets yaffs do its own ECC"
  53         depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
  54         default n
  55         help
  56           This enables yaffs to use its own ECC functions instead of using
  57           the ones from the generic MTD-NAND driver.
  58
  59           If unsure, say N.
  60
  61 config YAFFS_ECC_WRONG_ORDER
  62         bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
  63         depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
  64         default n
  65         help
  66           This makes yaffs_ecc.c use the same ecc byte order as Steven
  67           Hill's nand_ecc.c. If not set, then you get the same ecc byte
  68           order as SmartMedia.
  69
  70           If unsure, say N.
  71
  72 config YAFFS_YAFFS2
  73         bool "2048 byte (or larger) / page devices"
  74         depends on YAFFS_FS
  75         default y
  76         help
  77           Enable yaffs2 support -- yaffs for >= 2K bytes per page devices
  78
  79           If unsure, say Y.
  80
  81 config YAFFS_AUTO_YAFFS2
  82         bool "Autoselect yaffs2 format"
  83         depends on YAFFS_YAFFS2
  84         default y
  85         help
  86           Without this, you need to explicitely use yaffs2 as the file
  87           system type. With this, you can say "yaffs" and yaffs or yaffs2
  88           will be used depending on the device page size (yaffs on
  89           512-byte page devices, yaffs2 on 2K page devices).
  90
  91           If unsure, say Y.
  92
  93 config YAFFS_DISABLE_TAGS_ECC
  94         bool "Disable yaffs from doing ECC on tags by default"
  95         depends on YAFFS_FS && YAFFS_YAFFS2
  96         default n
  97         help
  98           This defaults yaffs to using its own ECC calculations on tags instead of
  99           just relying on the MTD.
 100           This behavior can also be overridden with tags_ecc_on and
 101           tags_ecc_off mount options.
 102
 103           If unsure, say N.
 104
 105 config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
 106         bool "Force chunk erase check"
 107         depends on YAFFS_FS
 108         default n
 109         help
 110           Normally yaffs only checks chunks before writing until an erased
 111           chunk is found. This helps to detect any partially written
 112           chunks that might have happened due to power loss.
 113
 114           Enabling this forces on the test that chunks are erased in flash
 115           before writing to them. This takes more time but is potentially
 116           a bit more secure.
 117
 118           Suggest setting Y during development and ironing out driver
 119           issues etc. Suggest setting to N if you want faster writing.
 120
 121           If unsure, say Y.
 122
 123 config YAFFS_EMPTY_LOST_AND_FOUND
 124         bool "Empty lost and found on boot"
 125         depends on YAFFS_FS
 126         default n
 127         help
 128           If this is enabled then the contents of lost and found is
 129           automatically dumped at mount.
 130
 131           If unsure, say N.
 132
 133 config YAFFS_DISABLE_BLOCK_REFRESHING
 134         bool "Disable yaffs2 block refreshing"
 135         depends on YAFFS_FS
 136         default n
 137         help
 138          If this is set, then block refreshing is disabled.
 139          Block refreshing infrequently refreshes the oldest block in
 140          a yaffs2 file system. This mechanism helps to refresh flash to
 141          mitigate against data loss. This is particularly useful for MLC.
 142
 143           If unsure, say N.
 144
 145 config YAFFS_DISABLE_BACKGROUND
 146         bool "Disable yaffs2 background processing"
 147         depends on YAFFS_FS
 148         default n
 149         help
 150          If this is set, then background processing is disabled.
 151          Background processing makes many foreground activities faster.
 152
 153          If unsure, say N.
 154
 155 config YAFFS_DISABLE_BAD_BLOCK_MARKING
 156         bool "Disable yaffs2 bad block marking"
 157         depends on YAFFS_FS
 158         default n
 159         help
 160          Useful during early flash bring up to prevent problems causing
 161          lots of bad block marking.
 162
 163          If unsure, say N.
 164
 165 config YAFFS_XATTR
 166         bool "Enable yaffs2 xattr support"
 167         depends on YAFFS_FS
 168         default y
 169         help
 170          If this is set then yaffs2 will provide xattr support.
 171          If unsure, say Y.