Mercurial > yaffs-ecoscentric-gpl

annotate Kconfig @ 396:7a4477ef2d02

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Merge branch 'master' of ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2
author Charles Manning <cdhmanning@gmail.com>
date Thu, 25 Mar 2010 16:09:21 +1300
parents 043bd07468b6
children d94b1449bddc
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bcf056049698 Added files that support the ability to "patchin" yaffs2 into the 2.6
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1 #
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2 # YAFFS file system configurations
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3 #
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5 config YAFFS_FS
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6 tristate "YAFFS2 file system support"
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7 default n
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8 depends on MTD_BLOCK
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9 select YAFFS_YAFFS1
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10 select YAFFS_YAFFS2
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11 help
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12 YAFFS2, or Yet Another Flash Filing System, is a filing system
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13 optimised for NAND Flash chips.
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14
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15 To compile the YAFFS2 file system support as a module, choose M
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16 here: the module will be called yaffs2.
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17
bcf056049698 Added files that support the ability to "patchin" yaffs2 into the 2.6
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18 If unsure, say N.
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19
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20 Further information on YAFFS2 is available at
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21 <http://www.aleph1.co.uk/yaffs/>.
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22
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23 config YAFFS_YAFFS1
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24 bool "512 byte / page devices"
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25 depends on YAFFS_FS
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26 default y
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27 help
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28 Enable YAFFS1 support -- yaffs for 512 byte / page devices
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29
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30 Not needed for 2K-page devices.
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31
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32 If unsure, say Y.
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33
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34 config YAFFS_9BYTE_TAGS
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35 bool "Use older-style on-NAND data format with pageStatus byte"
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36 depends on YAFFS_YAFFS1
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37 default n
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38 help
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39
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40 Older-style on-NAND data format has a "pageStatus" byte to record
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41 chunk/page state. This byte is zero when the page is discarded.
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42 Choose this option if you have existing on-NAND data using this
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43 format that you need to continue to support. New data written
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44 also uses the older-style format. Note: Use of this option
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45 generally requires that MTD's oob layout be adjusted to use the
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35ef89b77a94 Update comments about use of CONFIG_YAFFS_9BYTE_TAGS option.
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46 older-style format. See notes on tags formats and MTD versions
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47 in yaffs_mtdif1.c.
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48
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49 If unsure, say N.
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50
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51 config YAFFS_DOES_ECC
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52 bool "Lets Yaffs do its own ECC"
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53 depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
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54 default n
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55 help
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56 This enables Yaffs to use its own ECC functions instead of using
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57 the ones from the generic MTD-NAND driver.
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58
61
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59 If unsure, say N.
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61 config YAFFS_ECC_WRONG_ORDER
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62 bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
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63 depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
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64 default n
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65 help
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66 This makes yaffs_ecc.c use the same ecc byte order as Steven
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67 Hill's nand_ecc.c. If not set, then you get the same ecc byte
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68 order as SmartMedia.
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70 If unsure, say N.
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71
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72 config YAFFS_YAFFS2
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73 bool "2048 byte (or larger) / page devices"
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74 depends on YAFFS_FS
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75 default y
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76 help
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77 Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices
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78
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79 If unsure, say Y.
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80
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81 config YAFFS_AUTO_YAFFS2
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82 bool "Autoselect yaffs2 format"
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83 depends on YAFFS_YAFFS2
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84 default y
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85 help
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86 Without this, you need to explicitely use yaffs2 as the file
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87 system type. With this, you can say "yaffs" and yaffs or yaffs2
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88 will be used depending on the device page size (yaffs on
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89 512-byte page devices, yaffs2 on 2K page devices).
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90
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91 If unsure, say Y.
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92
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93 config YAFFS_DISABLE_TAGS_ECC
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94 bool "Disable YAFFS from doing ECC on tags by default"
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95 depends on YAFFS_FS && YAFFS_YAFFS2
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96 default n
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97 help
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98 This defaults Yaffs to using its own ECC calculations on tags instead of
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99 just relying on the MTD.
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100 This behavior can also be overridden with tags_ecc_on and
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101 tags_ecc_off mount options.
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102
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103 If unsure, say N.
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104
121
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105 config YAFFS_DISABLE_LAZY_LOAD
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106 bool "Disable lazy loading"
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107 depends on YAFFS_YAFFS2
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108 default n
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109 help
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110 "Lazy loading" defers loading file details until they are
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111 required. This saves mount time, but makes the first look-up
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112 a bit longer.
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113
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114 Lazy loading will only happen if enabled by this option being 'n'
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115 and if the appropriate tags are available, else yaffs2 will
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116 automatically fall back to immediate loading and do the right
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117 thing.
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118
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119 Lazy laoding will be required by checkpointing.
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120
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121 Setting this to 'y' will disable lazy loading.
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122
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123 If unsure, say N.
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124
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125
104
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126 config YAFFS_DISABLE_WIDE_TNODES
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127 bool "Turn off wide tnodes"
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128 depends on YAFFS_FS
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129 default n
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130 help
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131 Wide tnodes are only used for NAND arrays >=32MB for 512-byte
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132 page devices and >=128MB for 2k page devices. They use slightly
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133 more RAM but are faster since they eliminate chunk group
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134 searching.
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135
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136 Setting this to 'y' will force tnode width to 16 bits and save
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137 memory but make large arrays slower.
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138
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139 If unsure, say N.
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140
142
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141 config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
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142 bool "Force chunk erase check"
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143 depends on YAFFS_FS
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144 default n
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145 help
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146 Normally YAFFS only checks chunks before writing until an erased
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147 chunk is found. This helps to detect any partially written
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148 chunks that might have happened due to power loss.
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149
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150 Enabling this forces on the test that chunks are erased in flash
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151 before writing to them. This takes more time but is potentially
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152 a bit more secure.
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153
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154 Suggest setting Y during development and ironing out driver
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155 issues etc. Suggest setting to N if you want faster writing.
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156
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157 If unsure, say Y.
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158
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159 config YAFFS_SHORT_NAMES_IN_RAM
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160 bool "Cache short names in RAM"
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161 depends on YAFFS_FS
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162 default y
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163 help
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164 If this config is set, then short names are stored with the
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165 yaffs_Object. This costs an extra 16 bytes of RAM per object,
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166 but makes look-ups faster.
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167
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168 If unsure, say Y.
311
97a4bd3d225e Add fix for hanging objects
charles <charles>
parents: 300
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169
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parents: 300
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170 config YAFFS_EMPTY_LOST_AND_FOUND
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171 bool "Empty lost and found on boot"
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172 depends on YAFFS_FS
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173 default n
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parents: 300
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174 help
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parents: 300
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175 If this is enabled then the contents of lost and found is
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charles <charles>
parents: 300
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176 automatically dumped at mount.
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parents: 300
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177
374
043bd07468b6 Add conditional compilation for background processing
charles <charles>
parents: 373
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178 If unsure, say N.
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parents: 373
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179
365
db12031081bc Add block refreshing feature
charles <charles>
parents: 311
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180 config YAFFS_DISABLE_BLOCK_REFRESHING
373
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charles <charles>
parents: 365
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181 bool "Disable yaffs2 block refreshing"
365
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parents: 311
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182 depends on YAFFS_FS
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183 default n
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184 help
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185 If this is set, then block refreshing is disabled.
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186 Block refreshing infrequently refreshes the oldest block in
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parents: 311
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187 a yaffs2 file system. This mechanism helps to refresh flash to
db12031081bc Add block refreshing feature
charles <charles>
parents: 311
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188 mitigate against data loss. This is particularly useful for MLC.
374
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parents: 373
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189
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parents: 373
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190 If unsure, say N.
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parents: 373
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191
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parents: 373
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192 config YAFFS_DISABLE_BACKGROUND
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parents: 373
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193 bool "Disable yaffs2 background processing"
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parents: 373
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194 depends on YAFFS_FS
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195 default n
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196 help
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parents: 373
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197 If this is set, then background processing is disabled.
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parents: 373
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198 Background processing makes many foreground activities faster.
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charles <charles>
parents: 373
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199
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parents: 373
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200 If unsure, say N.