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1#
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_LAZY_LOAD
94	bool "Disable lazy loading"
95	depends on YAFFS_YAFFS2
96	default n
97	help
98	  "Lazy loading" defers loading file details until they are
99	  required. This saves mount time, but makes the first look-up
100	  a bit longer.
101
102	  Lazy loading will only happen if enabled by this option being 'n'
103	  and if the appropriate tags are available, else yaffs2 will
104	  automatically fall back to immediate loading and do the right
105	  thing.
106
107	  Lazy laoding will be required by checkpointing.
108
109	  Setting this to 'y' will disable lazy loading.
110
111	  If unsure, say N.
112
113
114config YAFFS_DISABLE_WIDE_TNODES
115	bool "Turn off wide tnodes"
116	depends on YAFFS_FS
117	default n
118	help
119	  Wide tnodes are only used for NAND arrays >=32MB for 512-byte
120	  page devices and >=128MB for 2k page devices. They use slightly
121	  more RAM but are faster since they eliminate chunk group
122	  searching.
123
124	  Setting this to 'y' will force tnode width to 16 bits and save
125	  memory but make large arrays slower.
126
127	  If unsure, say N.
128
129config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
130	bool "Force chunk erase check"
131	depends on YAFFS_FS
132	default n
133	help
134          Normally YAFFS only checks chunks before writing until an erased
135	  chunk is found. This helps to detect any partially written
136	  chunks that might have happened due to power loss.
137
138	  Enabling this forces on the test that chunks are erased in flash
139	  before writing to them. This takes more time but is potentially
140	  a bit more secure.
141
142	  Suggest setting Y during development and ironing out driver
143	  issues etc. Suggest setting to N if you want faster writing.
144
145	  If unsure, say Y.
146
147config YAFFS_SHORT_NAMES_IN_RAM
148	bool "Cache short names in RAM"
149	depends on YAFFS_FS
150	default y
151	help
152	  If this config is set, then short names are stored with the
153	  yaffs_Object.  This costs an extra 16 bytes of RAM per object,
154	  but makes look-ups faster.
155
156	  If unsure, say Y.
157