2 # YAFFS file system configurations
6 tristate "YAFFS2 file system support"
12 YAFFS2, or Yet Another Flash Filing System, is a filing system
13 optimised for NAND Flash chips.
15 To compile the YAFFS2 file system support as a module, choose M here:
16 the module will be called yaffs2.
20 Further information on YAFFS2 is available at
21 <http://www.aleph1.co.uk/yaffs/>.
24 bool "512 byte / page devices"
28 Enable YAFFS1 support -- yaffs for 512 byte / page devices
33 bool "Lets Yaffs do its own ECC"
34 depends on YAFFS_FS && YAFFS_YAFFS1
37 This enables Yaffs to use its own ECC functions instead of using
38 the ones from the generic MTD-NAND driver.
42 config YAFFS_ECC_WRONG_ORDER
43 bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
44 depends on YAFFS_FS && YAFFS_DOES_ECC
47 This makes yaffs_ecc.c use the same ecc byte order as
48 Steven Hill's nand_ecc.c. If not set, then you get the
49 same ecc byte order as SmartMedia.
54 bool "2048 byte (or larger) / page devices"
58 Enable YAFFS2 support -- yaffs for >= 2048 byte / page larger devices
62 config YAFFS_AUTO_YAFFS2
63 bool "Autoselect yaffs2 format"
64 depends on YAFFS_YAFFS2
67 Without this, you need to explicitely use yaffs2 as the file
68 system type. With this, you can say "yaffs" and yaffs or yaffs2
69 will be used depending on the device page size.
73 config YAFFS_DISABLE_LAZY_LOAD
74 bool "Disable lazy loading"
75 depends on YAFFS_YAFFS2
78 "Lazy loading" defers loading file details until they are
79 required. This saves mount time, but makes the first look-up
82 Lazy loading will only happen if enabled by this option being 'n'
83 and if the appropriate tags are available, else yaffs2 will
84 automatically fall back to immediate loading and do the right
87 Lazy laoding will be required by checkpointing.
89 Setting this to 'y' will disable lazy loading.
93 config YAFFS_DISABLE_WIDE_TNODES
94 bool "Turn off wide tnodes"
98 Wide tnodes are only used for large NAND arrays (>=32MB for
99 512-byte page devices and >=128MB for 2k page devices). They use
100 slightly more RAM but are faster since they eliminate chunk group
103 Setting this to 'y' will force tnode width to 16 bits and make
108 config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
109 bool "Force chunk erase check"
113 Normally YAFFS only checks chunks before writing until an erased
114 chunk is found. This helps to detect any partially written chunks
115 that might have happened due to power loss.
117 Enabling this forces on the test that chunks are erased in flash
118 before writing to them. This takes more time but is potentially a
121 Suggest setting Y during development and ironing out driver issues
122 etc. Suggest setting to N if you want faster writing.
126 config YAFFS_SHORT_NAMES_IN_RAM
127 bool "Cache short names in RAM"
131 If this config is set, then short names are stored with the
132 yaffs_Object. This costs an extra 16 bytes of RAM per object,
133 but makes look-ups faster.