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Arve Hjønnevåg3de69a72010-05-18 20:35:30 -07001#
2# YAFFS file system configurations
3#
4
5config YAFFS_FS
6 tristate "YAFFS2 file system support"
7 default n
8 depends on MTD_BLOCK
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
23config 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
34config 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 in yaffs_mtdif1.c.
48
49 If unsure, say N.
50
51config YAFFS_DOES_ECC
52 bool "Lets Yaffs do its own ECC"
53 depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
54 default n
55 help
56 This enables Yaffs to use its own ECC functions instead of using
57 the ones from the generic MTD-NAND driver.
58
59 If unsure, say N.
60
61config YAFFS_ECC_WRONG_ORDER
62 bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
63 depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
64 default n
65 help
66 This makes yaffs_ecc.c use the same ecc byte order as Steven
67 Hill's nand_ecc.c. If not set, then you get the same ecc byte
68 order as SmartMedia.
69
70 If unsure, say N.
71
72config YAFFS_YAFFS2
73 bool "2048 byte (or larger) / page devices"
74 depends on YAFFS_FS
75 default y
76 help
77 Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices
78
79 If unsure, say Y.
80
81config YAFFS_AUTO_YAFFS2
82 bool "Autoselect yaffs2 format"
83 depends on YAFFS_YAFFS2
84 default y
85 help
86 Without this, you need to explicitely use yaffs2 as the file
87 system type. With this, you can say "yaffs" and yaffs or yaffs2
88 will be used depending on the device page size (yaffs on
89 512-byte page devices, yaffs2 on 2K page devices).
90
91 If unsure, say Y.
92
93config YAFFS_DISABLE_TAGS_ECC
94 bool "Disable YAFFS from doing ECC on tags by default"
95 depends on YAFFS_FS && YAFFS_YAFFS2
96 default n
97 help
98 This defaults Yaffs to using its own ECC calculations on tags instead of
99 just relying on the MTD.
100 This behavior can also be overridden with tags_ecc_on and
101 tags_ecc_off mount options.
102
103 If unsure, say N.
104
105config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
106 bool "Force chunk erase check"
107 depends on YAFFS_FS
108 default n
109 help
110 Normally YAFFS only checks chunks before writing until an erased
111 chunk is found. This helps to detect any partially written
112 chunks that might have happened due to power loss.
113
114 Enabling this forces on the test that chunks are erased in flash
115 before writing to them. This takes more time but is potentially
116 a bit more secure.
117
118 Suggest setting Y during development and ironing out driver
119 issues etc. Suggest setting to N if you want faster writing.
120
121 If unsure, say Y.
122
123config YAFFS_EMPTY_LOST_AND_FOUND
124 bool "Empty lost and found on boot"
125 depends on YAFFS_FS
126 default n
127 help
128 If this is enabled then the contents of lost and found is
129 automatically dumped at mount.
130
131 If unsure, say N.
132
133config YAFFS_DISABLE_BLOCK_REFRESHING
134 bool "Disable yaffs2 block refreshing"
135 depends on YAFFS_FS
136 default n
137 help
138 If this is set, then block refreshing is disabled.
139 Block refreshing infrequently refreshes the oldest block in
140 a yaffs2 file system. This mechanism helps to refresh flash to
141 mitigate against data loss. This is particularly useful for MLC.
142
143 If unsure, say N.
144
145config YAFFS_DISABLE_BACKGROUND
146 bool "Disable yaffs2 background processing"
147 depends on YAFFS_FS
148 default n
149 help
150 If this is set, then background processing is disabled.
151 Background processing makes many foreground activities faster.
152
153 If unsure, say N.
154
155config YAFFS_XATTR
156 bool "Enable yaffs2 xattr support"
157 depends on YAFFS_FS
158 default y
159 help
160 If this is set then yaffs2 will provide xattr support.
161 If unsure, say Y.