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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11427 3c298f89-4303-0410-b956-a3cf2f4a3e73
176 lines
5.3 KiB
Plaintext
176 lines
5.3 KiB
Plaintext
#
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# YAFFS file system configurations
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#
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config YAFFS_FS
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tristate "YAFFS2 file system support"
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default n
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depends on MTD
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select YAFFS_YAFFS1
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select YAFFS_YAFFS2
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help
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YAFFS2, or Yet Another Flash Filing System, is a filing system
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optimised for NAND Flash chips.
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To compile the YAFFS2 file system support as a module, choose M
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here: the module will be called yaffs2.
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If unsure, say N.
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Further information on YAFFS2 is available at
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<http://www.aleph1.co.uk/yaffs/>.
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config YAFFS_YAFFS1
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bool "512 byte / page devices"
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depends on YAFFS_FS
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default y
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help
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Enable YAFFS1 support -- yaffs for 512 byte / page devices
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Not needed for 2K-page devices.
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If unsure, say Y.
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config YAFFS_9BYTE_TAGS
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bool "Use older-style on-NAND data format with pageStatus byte"
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depends on YAFFS_YAFFS1
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default n
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help
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Older-style on-NAND data format has a "pageStatus" byte to record
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chunk/page state. This byte is zero when the page is discarded.
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Choose this option if you have existing on-NAND data using this
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format that you need to continue to support. New data written
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also uses the older-style format. Note: Use of this option
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generally requires that MTD's oob layout be adjusted to use the
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older-style format. See notes on tags formats and MTD versions.
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If unsure, say N.
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config YAFFS_DOES_ECC
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bool "Lets Yaffs do its own ECC"
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depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
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default n
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help
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This enables Yaffs to use its own ECC functions instead of using
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the ones from the generic MTD-NAND driver.
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If unsure, say N.
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config YAFFS_ECC_WRONG_ORDER
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bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
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depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
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default n
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help
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This makes yaffs_ecc.c use the same ecc byte order as Steven
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Hill's nand_ecc.c. If not set, then you get the same ecc byte
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order as SmartMedia.
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If unsure, say N.
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config YAFFS_YAFFS2
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bool "2048 byte (or larger) / page devices"
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depends on YAFFS_FS
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default y
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help
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Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices
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If unsure, say Y.
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config YAFFS_AUTO_YAFFS2
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bool "Autoselect yaffs2 format"
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depends on YAFFS_YAFFS2
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default y
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help
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Without this, you need to explicitely use yaffs2 as the file
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system type. With this, you can say "yaffs" and yaffs or yaffs2
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will be used depending on the device page size (yaffs on
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512-byte page devices, yaffs2 on 2K page devices).
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If unsure, say Y.
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config YAFFS_DISABLE_LAZY_LOAD
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bool "Disable lazy loading"
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depends on YAFFS_YAFFS2
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default n
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help
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"Lazy loading" defers loading file details until they are
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required. This saves mount time, but makes the first look-up
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a bit longer.
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Lazy loading will only happen if enabled by this option being 'n'
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and if the appropriate tags are available, else yaffs2 will
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automatically fall back to immediate loading and do the right
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thing.
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Lazy laoding will be required by checkpointing.
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Setting this to 'y' will disable lazy loading.
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If unsure, say N.
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config YAFFS_CHECKPOINT_RESERVED_BLOCKS
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int "Reserved blocks for checkpointing"
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depends on YAFFS_YAFFS2
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default 10
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help
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Give the number of Blocks to reserve for checkpointing.
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Checkpointing saves the state at unmount so that mounting is
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much faster as a scan of all the flash to regenerate this state
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is not needed. These Blocks are reserved per partition, so if
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you have very small partitions the default (10) may be a mess
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for you. You can set this value to 0, but that does not mean
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checkpointing is disabled at all. There only won't be any
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specially reserved blocks for checkpointing, so if there is
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enough free space on the filesystem, it will be used for
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checkpointing.
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If unsure, leave at default (10), but don't wonder if there are
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always 2MB used on your large page device partition (10 x 2k
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pagesize). When using small partitions or when being very small
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on space, you probably want to set this to zero.
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config YAFFS_DISABLE_WIDE_TNODES
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bool "Turn off wide tnodes"
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depends on YAFFS_FS
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default n
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help
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Wide tnodes are only used for NAND arrays >=32MB for 512-byte
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page devices and >=128MB for 2k page devices. They use slightly
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more RAM but are faster since they eliminate chunk group
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searching.
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Setting this to 'y' will force tnode width to 16 bits and save
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memory but make large arrays slower.
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If unsure, say N.
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config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
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bool "Force chunk erase check"
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depends on YAFFS_FS
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default n
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help
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Normally YAFFS only checks chunks before writing until an erased
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chunk is found. This helps to detect any partially written
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chunks that might have happened due to power loss.
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Enabling this forces on the test that chunks are erased in flash
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before writing to them. This takes more time but is potentially
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a bit more secure.
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Suggest setting Y during development and ironing out driver
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issues etc. Suggest setting to N if you want faster writing.
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If unsure, say Y.
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config YAFFS_SHORT_NAMES_IN_RAM
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bool "Cache short names in RAM"
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depends on YAFFS_FS
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default y
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help
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If this config is set, then short names are stored with the
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yaffs_Object. This costs an extra 16 bytes of RAM per object,
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but makes look-ups faster.
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If unsure, say Y.
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