[package] udev: bump to 173
[openwrt.git] / target / linux / generic / files / fs / yaffs2 / Kconfig
1 #
2 # YAFFS file system configurations
3 #
4
5 config YAFFS_FS
6 tristate "YAFFS2 file system support"
7 default n
8 depends on MTD
9 select YAFFS_YAFFS1
10 select YAFFS_YAFFS2
11 help
12 YAFFS2, or Yet Another Flash Filing System, is a filing system
13 optimised for NAND Flash chips.
14
15 To compile the YAFFS2 file system support as a module, choose M
16 here: the module will be called yaffs2.
17
18 If unsure, say N.
19
20 Further information on YAFFS2 is available at
21 <http://www.aleph1.co.uk/yaffs/>.
22
23 config YAFFS_YAFFS1
24 bool "512 byte / page devices"
25 depends on YAFFS_FS
26 default y
27 help
28 Enable YAFFS1 support -- yaffs for 512 byte / page devices
29
30 Not needed for 2K-page devices.
31
32 If unsure, say Y.
33
34 config YAFFS_9BYTE_TAGS
35 bool "Use older-style on-NAND data format with pageStatus byte"
36 depends on YAFFS_YAFFS1
37 default n
38 help
39
40 Older-style on-NAND data format has a "pageStatus" byte to record
41 chunk/page state. This byte is zero when the page is discarded.
42 Choose this option if you have existing on-NAND data using this
43 format that you need to continue to support. New data written
44 also uses the older-style format. Note: Use of this option
45 generally requires that MTD's oob layout be adjusted to use the
46 older-style format. See notes on tags formats and MTD versions.
47
48 If unsure, say N.
49
50 config YAFFS_DOES_ECC
51 bool "Lets Yaffs do its own ECC"
52 depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
53 default n
54 help
55 This enables Yaffs to use its own ECC functions instead of using
56 the ones from the generic MTD-NAND driver.
57
58 If unsure, say N.
59
60 config YAFFS_ECC_WRONG_ORDER
61 bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
62 depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
63 default n
64 help
65 This makes yaffs_ecc.c use the same ecc byte order as Steven
66 Hill's nand_ecc.c. If not set, then you get the same ecc byte
67 order as SmartMedia.
68
69 If unsure, say N.
70
71 config YAFFS_YAFFS2
72 bool "2048 byte (or larger) / page devices"
73 depends on YAFFS_FS
74 default y
75 help
76 Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices
77
78 If unsure, say Y.
79
80 config YAFFS_AUTO_YAFFS2
81 bool "Autoselect yaffs2 format"
82 depends on YAFFS_YAFFS2
83 default y
84 help
85 Without this, you need to explicitely use yaffs2 as the file
86 system type. With this, you can say "yaffs" and yaffs or yaffs2
87 will be used depending on the device page size (yaffs on
88 512-byte page devices, yaffs2 on 2K page devices).
89
90 If unsure, say Y.
91
92 config YAFFS_DISABLE_LAZY_LOAD
93 bool "Disable lazy loading"
94 depends on YAFFS_YAFFS2
95 default n
96 help
97 "Lazy loading" defers loading file details until they are
98 required. This saves mount time, but makes the first look-up
99 a bit longer.
100
101 Lazy loading will only happen if enabled by this option being 'n'
102 and if the appropriate tags are available, else yaffs2 will
103 automatically fall back to immediate loading and do the right
104 thing.
105
106 Lazy laoding will be required by checkpointing.
107
108 Setting this to 'y' will disable lazy loading.
109
110 If unsure, say N.
111
112 config YAFFS_CHECKPOINT_RESERVED_BLOCKS
113 int "Reserved blocks for checkpointing"
114 depends on YAFFS_YAFFS2
115 default 10
116 help
117 Give the number of Blocks to reserve for checkpointing.
118 Checkpointing saves the state at unmount so that mounting is
119 much faster as a scan of all the flash to regenerate this state
120 is not needed. These Blocks are reserved per partition, so if
121 you have very small partitions the default (10) may be a mess
122 for you. You can set this value to 0, but that does not mean
123 checkpointing is disabled at all. There only won't be any
124 specially reserved blocks for checkpointing, so if there is
125 enough free space on the filesystem, it will be used for
126 checkpointing.
127
128 If unsure, leave at default (10), but don't wonder if there are
129 always 2MB used on your large page device partition (10 x 2k
130 pagesize). When using small partitions or when being very small
131 on space, you probably want to set this to zero.
132
133 config YAFFS_DISABLE_WIDE_TNODES
134 bool "Turn off wide tnodes"
135 depends on YAFFS_FS
136 default n
137 help
138 Wide tnodes are only used for NAND arrays >=32MB for 512-byte
139 page devices and >=128MB for 2k page devices. They use slightly
140 more RAM but are faster since they eliminate chunk group
141 searching.
142
143 Setting this to 'y' will force tnode width to 16 bits and save
144 memory but make large arrays slower.
145
146 If unsure, say N.
147
148 config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
149 bool "Force chunk erase check"
150 depends on YAFFS_FS
151 default n
152 help
153 Normally YAFFS only checks chunks before writing until an erased
154 chunk is found. This helps to detect any partially written
155 chunks that might have happened due to power loss.
156
157 Enabling this forces on the test that chunks are erased in flash
158 before writing to them. This takes more time but is potentially
159 a bit more secure.
160
161 Suggest setting Y during development and ironing out driver
162 issues etc. Suggest setting to N if you want faster writing.
163
164 If unsure, say Y.
165
166 config YAFFS_SHORT_NAMES_IN_RAM
167 bool "Cache short names in RAM"
168 depends on YAFFS_FS
169 default y
170 help
171 If this config is set, then short names are stored with the
172 yaffs_Object. This costs an extra 16 bytes of RAM per object,
173 but makes look-ups faster.
174
175 If unsure, say Y.
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