#
-# YAFFS file system configurations
+# yaffs file system configurations
#
config YAFFS_FS
- tristate "YAFFS2 file system support"
+ tristate "yaffs2 file system support"
default n
- depends on MTD
+ depends on MTD_BLOCK
select YAFFS_YAFFS1
select YAFFS_YAFFS2
help
- YAFFS2, or Yet Another Flash Filing System, is a filing system
+ yaffs2, or Yet Another Flash File System, is a file system
optimised for NAND Flash chips.
- To compile the YAFFS2 file system support as a module, choose M
+ To compile the yaffs2 file system support as a module, choose M
here: the module will be called yaffs2.
If unsure, say N.
- Further information on YAFFS2 is available at
+ Further information on yaffs2 is available at
<http://www.aleph1.co.uk/yaffs/>.
config YAFFS_YAFFS1
depends on YAFFS_FS
default y
help
- Enable YAFFS1 support -- yaffs for 512 byte / page devices
-
+ Enable yaffs1 support -- yaffs for 512 byte / page devices
+
Not needed for 2K-page devices.
If unsure, say Y.
format that you need to continue to support. New data written
also uses the older-style format. Note: Use of this option
generally requires that MTD's oob layout be adjusted to use the
- older-style format. See notes on tags formats and MTD versions.
+ older-style format. See notes on tags formats and MTD versions
+ in yaffs_mtdif1.c.
If unsure, say N.
config YAFFS_DOES_ECC
- bool "Lets Yaffs do its own ECC"
+ bool "Lets yaffs do its own ECC"
depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
default n
help
- This enables Yaffs to use its own ECC functions instead of using
+ This enables yaffs to use its own ECC functions instead of using
the ones from the generic MTD-NAND driver.
If unsure, say N.
depends on YAFFS_FS
default y
help
- Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices
+ Enable yaffs2 support -- yaffs for >= 2K bytes per page devices
If unsure, say Y.
If unsure, say Y.
-config YAFFS_DISABLE_LAZY_LOAD
- bool "Disable lazy loading"
- depends on YAFFS_YAFFS2
+config YAFFS_DISABLE_TAGS_ECC
+ bool "Disable yaffs from doing ECC on tags by default"
+ depends on YAFFS_FS && YAFFS_YAFFS2
default n
help
- "Lazy loading" defers loading file details until they are
- required. This saves mount time, but makes the first look-up
- a bit longer.
-
- Lazy loading will only happen if enabled by this option being 'n'
- and if the appropriate tags are available, else yaffs2 will
- automatically fall back to immediate loading and do the right
- thing.
-
- Lazy laoding will be required by checkpointing.
-
- Setting this to 'y' will disable lazy loading.
-
- If unsure, say N.
-
-config YAFFS_CHECKPOINT_RESERVED_BLOCKS
- int "Reserved blocks for checkpointing"
- depends on YAFFS_YAFFS2
- default 10
- help
- Give the number of Blocks to reserve for checkpointing.
- Checkpointing saves the state at unmount so that mounting is
- much faster as a scan of all the flash to regenerate this state
- is not needed. These Blocks are reserved per partition, so if
- you have very small partitions the default (10) may be a mess
- for you. You can set this value to 0, but that does not mean
- checkpointing is disabled at all. There only won't be any
- specially reserved blocks for checkpointing, so if there is
- enough free space on the filesystem, it will be used for
- checkpointing.
-
- If unsure, leave at default (10), but don't wonder if there are
- always 2MB used on your large page device partition (10 x 2k
- pagesize). When using small partitions or when being very small
- on space, you probably want to set this to zero.
-
-config YAFFS_DISABLE_WIDE_TNODES
- bool "Turn off wide tnodes"
- depends on YAFFS_FS
- default n
- help
- Wide tnodes are only used for NAND arrays >=32MB for 512-byte
- page devices and >=128MB for 2k page devices. They use slightly
- more RAM but are faster since they eliminate chunk group
- searching.
-
- Setting this to 'y' will force tnode width to 16 bits and save
- memory but make large arrays slower.
+ This defaults yaffs to using its own ECC calculations on tags instead of
+ just relying on the MTD.
+ This behavior can also be overridden with tags_ecc_on and
+ tags_ecc_off mount options.
If unsure, say N.
depends on YAFFS_FS
default n
help
- Normally YAFFS only checks chunks before writing until an erased
+ Normally yaffs only checks chunks before writing until an erased
chunk is found. This helps to detect any partially written
chunks that might have happened due to power loss.
Enabling this forces on the test that chunks are erased in flash
before writing to them. This takes more time but is potentially
a bit more secure.
-
+
Suggest setting Y during development and ironing out driver
- issues etc. Suggest setting to N if you want faster writing.
+ issues etc. Suggest setting to N if you want faster writing.
If unsure, say Y.
-config YAFFS_SHORT_NAMES_IN_RAM
- bool "Cache short names in RAM"
+config YAFFS_EMPTY_LOST_AND_FOUND
+ bool "Empty lost and found on boot"
depends on YAFFS_FS
- default y
+ default n
help
- If this config is set, then short names are stored with the
- yaffs_Object. This costs an extra 16 bytes of RAM per object,
- but makes look-ups faster.
+ If this is enabled then the contents of lost and found is
+ automatically dumped at mount.
- If unsure, say Y.
+ If unsure, say N.
+
+config YAFFS_DISABLE_BLOCK_REFRESHING
+ bool "Disable yaffs2 block refreshing"
+ depends on YAFFS_FS
+ default n
+ help
+ If this is set, then block refreshing is disabled.
+ Block refreshing infrequently refreshes the oldest block in
+ a yaffs2 file system. This mechanism helps to refresh flash to
+ mitigate against data loss. This is particularly useful for MLC.
+
+ If unsure, say N.
+
+config YAFFS_DISABLE_BACKGROUND
+ bool "Disable yaffs2 background processing"
+ depends on YAFFS_FS
+ default n
+ help
+ If this is set, then background processing is disabled.
+ Background processing makes many foreground activities faster.
+
+ If unsure, say N.
+
+config YAFFS_XATTR
+ bool "Enable yaffs2 xattr support"
+ depends on YAFFS_FS
+ default y
+ help
+ If this is set then yaffs2 will provide xattr support.
+ If unsure, say Y.
projects / yaffs2.git / blobdiff