kconfig

YAFFS

#
# YAFFS file system configurations
#

config YAFFS_FS
	tristate "YAFFS2 file system support"
	default n
	select YAFFS_YAFFS1
	select YAFFS_YAFFS2
	help
	  YAFFS2, or Yet Another Flash Filing System, is a filing system
	  optimised for NAND Flash chips.

	  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
	  <http://www.aleph1.co.uk/yaffs/>.

config YAFFS_YAFFS1
	bool "512 byte / page devices"
	depends on YAFFS_FS
	default y
	help
	  Enable YAFFS1 support -- yaffs for 512 byte / page devices

	  If unsure, say Y.

config YAFFS_DOES_ECC
	bool "Lets Yaffs do its own ECC"
	depends on YAFFS_FS && YAFFS_YAFFS1
	default n
	help
	  This enables Yaffs to use its own ECC functions instead of using
	  the ones from the generic MTD-NAND driver.

	  If unsure, say N.

config YAFFS_ECC_WRONG_ORDER
	bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
	depends on YAFFS_FS && YAFFS_DOES_ECC
	default n
	help
	  This makes yaffs_ecc.c use the same ecc byte order as
	  Steven Hill's nand_ecc.c. If not set, then you get the
	  same ecc byte order as SmartMedia.

	  If unsure, say N.

config YAFFS_YAFFS2
	bool "2048 byte (or larger) / page devices"
	depends on YAFFS_FS
	default y
	help
	  Enable YAFFS2 support -- yaffs for >= 2048 byte / page larger devices

	  If unsure, say Y.

config YAFFS_AUTO_YAFFS2
	bool "Autoselect yaffs2 format"
	depends on YAFFS_YAFFS2
	default y
	help
	  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_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_DISABLE_CHUNK_ERASED_CHECK
	bool "Turn off debug chunk erase check"
	depends on YAFFS_FS
	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.

	  If unsure, say Y.

config YAFFS_SHORT_NAMES_IN_RAM
	bool "Cache short names in RAM"
	depends on YAFFS_FS
	default y
	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 unsure, say Y.