config YAFFS_FS
tristate "YAFFS2 file system support"
default n
+ depends on MTD
+ select YAFFS_YAFFS1
+ select YAFFS_YAFFS2
help
YAFFS2, or Yet Another Flash Filing System, is a filing system
optimised for NAND Flash chips.
If unsure, say Y.
-config YAFFS_DISABLE_CHUNK_ERASED_CHECK
- bool "Turn off debug chunk erase check"
- depends on YAFFS_FS
+config YAFFS_AUTO_YAFFS2
+ bool "Autoselect yaffs2 format"
+ depends on YAFFS_YAFFS2
default y
help
- Enabling this turns off the test that chunks are erased in flash
- before writing to them. This is safe, since the write verification
- will fail. Suggest enabling the test (ie. say N)
- during development to help debug things.
+ Without this, you need to explicitely use yaffs2 as the file
+ system type. With this, you can say "yaffs" and yaffs or yaffs2
+ will be used depending on the device page size.
+
+ If unsure, say Y.
+
+config YAFFS_DISABLE_LAZY_LOAD
+ bool "Disable lazy loading"
+ depends on 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_DISABLE_WIDE_TNODES
+ bool "Turn off wide tnodes"
+ depends on YAFFS_FS
+ default n
+ help
+ Wide tnodes are only used for large 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 make
+ large arrays slower.
+
+ If unsure, say N.
+
+config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+ bool "Force chunk erase check"
+ depends on YAFFS_FS
+ default n
+ help
+ 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.
If unsure, say Y.