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 Filing System, is a filing 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
 106 config YAFFS_DISABLE_WIDE_TNODES
 107         bool "Turn off wide tnodes"
 108         depends on YAFFS_FS
 109         default n
 110         help
 111           Wide tnodes are only used for NAND arrays >=32MB for 512-byte
 112           page devices and >=128MB for 2k page devices. They use slightly
 113           more RAM but are faster since they eliminate chunk group
 114           searching.
 115
 116           Setting this to 'y' will force tnode width to 16 bits and save
 117           memory but make large arrays slower.
 118
 119           If unsure, say N.
 120
 121 config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
 122         bool "Force chunk erase check"
 123         depends on YAFFS_FS
 124         default n
 125         help
 126           Normally YAFFS only checks chunks before writing until an erased
 127           chunk is found. This helps to detect any partially written
 128           chunks that might have happened due to power loss.
 129
 130           Enabling this forces on the test that chunks are erased in flash
 131           before writing to them. This takes more time but is potentially
 132           a bit more secure.
 133
 134           Suggest setting Y during development and ironing out driver
 135           issues etc. Suggest setting to N if you want faster writing.
 136
 137           If unsure, say Y.
 138
 139 config YAFFS_SHORT_NAMES_IN_RAM
 140         bool "Cache short names in RAM"
 141         depends on YAFFS_FS
 142         default y
 143         help
 144           If this config is set, then short names are stored with the
 145           yaffs_Object.  This costs an extra 16 bytes of RAM per object,
 146           but makes look-ups faster.
 147
 148           If unsure, say Y.
 149
 150 config YAFFS_EMPTY_LOST_AND_FOUND
 151         bool "Empty lost and found on boot"
 152         depends on YAFFS_FS
 153         default n
 154         help
 155           If this is enabled then the contents of lost and found is
 156           automatically dumped at mount.
 157
 158           If unsure, say N.
 159
 160 config YAFFS_DISABLE_BLOCK_REFRESHING
 161         bool "Disable yaffs2 block refreshing"
 162         depends on YAFFS_FS
 163         default n
 164         help
 165          If this is set, then block refreshing is disabled.
 166          Block refreshing infrequently refreshes the oldest block in
 167          a yaffs2 file system. This mechanism helps to refresh flash to
 168          mitigate against data loss. This is particularly useful for MLC.
 169
 170           If unsure, say N.
 171
 172 config YAFFS_DISABLE_BACKGROUND
 173         bool "Disable yaffs2 background processing"
 174         depends on YAFFS_FS
 175         default n
 176         help
 177          If this is set, then background processing is disabled.
 178          Background processing makes many foreground activities faster.
 179
 180           If unsure, say N.
 181
 182 config YAFFS_XATTR
 183         bool "Enable yaffs2 xattr support"
 184         depends on YAFFS_FS
 185         default y
 186         help
 187          If this is set then yaffs2 will provide xattr support.
 188          If unsure, say Y.
 189
 190