Mercurial > yaffs-ecoscentric-gpl

annotate Kconfig @ 196:46d4855f90b0

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Change checkpoint to calculate number of blocks required instead of using a hardcoded value
author charles <charles>
date Mon, 03 Dec 2007 03:21:48 +0000
parents 35ef89b77a94
children b7f785925166
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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
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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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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
61
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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).
108
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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_LAZY_LOAD
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94 bool "Disable lazy loading"
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95 depends on YAFFS_YAFFS2
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96 default n
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97 help
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98 "Lazy loading" defers loading file details until they are
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99 required. This saves mount time, but makes the first look-up
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100 a bit longer.
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101
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102 Lazy loading will only happen if enabled by this option being 'n'
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103 and if the appropriate tags are available, else yaffs2 will
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104 automatically fall back to immediate loading and do the right
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105 thing.
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106
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107 Lazy laoding will be required by checkpointing.
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108
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109 Setting this to 'y' will disable lazy loading.
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110
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111 If unsure, say N.
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112
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113
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114 config YAFFS_DISABLE_WIDE_TNODES
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115 bool "Turn off wide tnodes"
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116 depends on YAFFS_FS
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117 default n
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118 help
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119 Wide tnodes are only used for NAND arrays >=32MB for 512-byte
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120 page devices and >=128MB for 2k page devices. They use slightly
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121 more RAM but are faster since they eliminate chunk group
104
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122 searching.
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123
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124 Setting this to 'y' will force tnode width to 16 bits and save
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125 memory but make large arrays slower.
104
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126
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127 If unsure, say N.
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128
142
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129 config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
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130 bool "Force chunk erase check"
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131 depends on YAFFS_FS
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132 default n
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133 help
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134 Normally YAFFS only checks chunks before writing until an erased
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135 chunk is found. This helps to detect any partially written
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136 chunks that might have happened due to power loss.
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137
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138 Enabling this forces on the test that chunks are erased in flash
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139 before writing to them. This takes more time but is potentially
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140 a bit more secure.
142
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141
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142 Suggest setting Y during development and ironing out driver
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143 issues etc. Suggest setting to N if you want faster writing.
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144
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145 If unsure, say Y.
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146
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147 config YAFFS_SHORT_NAMES_IN_RAM
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148 bool "Cache short names in RAM"
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149 depends on YAFFS_FS
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150 default y
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151 help
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152 If this config is set, then short names are stored with the
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153 yaffs_Object. This costs an extra 16 bytes of RAM per object,
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154 but makes look-ups faster.
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155
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156 If unsure, say Y.