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NAND: implement CYGSEM_IO_NAND_USE_BBT
author Ross Younger <wry@ecoscentric.com>
date Wed, 28 Oct 2009 15:10:17 +0000
parents 32bcd454bda4
children b72667909323
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rev   line source
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1 # ====================================================================
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2 #
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3 # nand.cdl
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4 #
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5 # eCos NAND flash library
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6 #
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7 # ====================================================================
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8 # ####ECOSGPLCOPYRIGHTBEGIN####
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9 # -------------------------------------------
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10 # This file is part of eCos, the Embedded Configurable Operating System.
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11 # Copyright (C) 2009 eCosCentric Limited.
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12 #
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13 # eCos is free software; you can redistribute it and/or modify it under
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14 # the terms of the GNU General Public License as published by the Free
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15 # Software Foundation; either version 2 or (at your option) any later
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16 # version.
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17 #
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18 # eCos is distributed in the hope that it will be useful, but WITHOUT
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19 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 # for more details.
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22 #
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23 # You should have received a copy of the GNU General Public License
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24 # along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 #
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27 # As a special exception, if other files instantiate templates or use
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28 # macros or inline functions from this file, or you compile this file
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29 # and link it with other works to produce a work based on this file,
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30 # this file does not by itself cause the resulting work to be covered by
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31 # the GNU General Public License. However the source code for this file
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32 # must still be made available in accordance with section (3) of the GNU
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33 # General Public License v2.
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34 #
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35 # This exception does not invalidate any other reasons why a work based
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36 # on this file might be covered by the GNU General Public License.
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37 # -------------------------------------------
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38 # ####ECOSGPLCOPYRIGHTEND####
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39 # ====================================================================
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40 ######DESCRIPTIONBEGIN####
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41 #
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42 # Author(s): wry
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43 # Date: 2009-02-23
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44 #
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45 #####DESCRIPTIONEND####
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46 #
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47 # ====================================================================
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48
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49 cdl_package CYGPKG_IO_NAND {
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50 display "NAND Flash access library"
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51 parent CYGPKG_IO
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52 include_dir cyg/nand
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53 doc ref/nand.html
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54 description "
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55 This package provides support for NAND flash devices. It provides
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56 both an application and a device interface. Further
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57 platform-specific package(s) are required to implement drivers for
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58 the particular devices present."
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59
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60 requires CYGINT_ISO_ERRNO_CODES
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61 requires CYGPKG_ISOINFRA
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62 requires CYGPKG_LIBC_STRING
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63 requires CYGINT_ISO_STRING_MEMFUNCS
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64 requires CYGPKG_LIBC_STDLIB
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65
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66 compile nand.c nand_bbt.c nand_ecc_mtd.c nand_oob.c util.c
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67 compile -library=libextras.a nandinit.cxx
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68
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69 cdl_option CYGSEM_IO_NAND_INTERFACE_VERSION {
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70 display "NAND device interface version"
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71 flavor data
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72 calculated 2
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73 description "The current compatibility level provided by
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74 the NAND layer. As the NAND device interface evolves, this
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75 version number will be incremented; devices may require
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76 that the infrastructure provide a certain level in order
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77 to function correctly."
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78 }
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79
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80 cdl_component CYGPKG_IO_NAND_OPTIONS {
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81 display "NAND library build options"
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82 flavor none
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83 description "
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84 Package specific build options including control over
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85 compiler flags used only in building the NAND library
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86 flash driver."
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87
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88 cdl_option CYGPKG_IO_NAND_CFLAGS_ADD {
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89 display "Additional compiler flags"
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90 flavor data
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91 no_define
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92 default_value { "-Werror" }
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93 description "
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94 This option modifies the set of compiler flags for
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95 building the NAND flash library. These flags
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96 are used in addition to the set of global flags."
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97 }
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98 cdl_option CYGPKG_IO_NAND_CFLAGS_REMOVE {
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99 display "Suppressed compiler flags"
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100 flavor data
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101 no_define
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102 default_value { "" }
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103 description "
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104 This option modifies the set of compiler flags for
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105 building the NAND flash library. These flags
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106 are removed from the set of global flags if present."
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107 }
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108 }
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109
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110 cdl_interface CYGHWR_IO_NAND_DEVICE {
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111 display "Hardware NAND device drivers"
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112 requires { CYGHWR_IO_NAND_DEVICE >= 1 }
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113 description "
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114 This calculated option shows the number of NAND devices on
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115 the current platform. The generic NAND support is disabled
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116 unless at least one device is present."
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117 }
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118
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119 cdl_component CYGSEM_IO_NAND_DEBUG {
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120 display "NAND debug output"
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121 default_value 1
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122 description "
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123 The NAND library has the ability to report debugging information
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124 by sending it to a printf-like function.
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125 This option is the master switch for all such output.
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126 "
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127
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128 cdl_option CYGSEM_IO_NAND_DEBUG_FN_DEFAULT {
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129 display "Global output function"
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130 flavor data
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131 default_value { "cyg_nand_defaultprintf" }
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132 description "
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133 This is the default function to use to send debugging output
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134 from the NAND library.
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135 (It may be overridden by individual device drivers.)
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136 The default value is a wrapper to diag_printf.
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137 "
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138 }
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139
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140 cdl_option CYGSEM_IO_NAND_DEBUG_LEVEL {
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141 display "Debug chatter level"
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142 flavor data
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143 legal_values 0 to 9
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144 default_value 1
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145 description "
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146 This option configures the degree to which the NAND code will
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147 print status messages as various operations are undertaken.
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148 Setting it to zero disables the status chatter altogether.
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149 Messages, when enabled, are printed using the printf-like
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150 function provided when the library is initialised.
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151 (Note that serious problems are always reported via
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152 the output function, regardless of this setting.)"
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153 compile nand_chatter.c
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154 }
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155 }
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156
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157 cdl_option CYGSEM_IO_NAND_READONLY {
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158 display "NAND layer is read-only"
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159 flavor bool
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160 default_value 0
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161 description "
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162 Selecting this option will globally disable all code which
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163 writes to NAND devices."
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164 }
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165
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166 cdl_option CYGSEM_IO_NAND_USE_BBT {
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167 display "NAND layer uses bad-block tables"
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168 flavor bool
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169 default_value 1
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170 description "
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171 Select this option to instruct the NAND library to use
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172 a Bad Block Table to keep track of blocks marked bad
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173 at the factory and any bad blocks which may develop during
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174 the life of the device. This is strongly recommended."
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175 }
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176
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177 cdl_option CYGNUM_NAND_PAGEBUFFER {
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178 display "Largest page size to support"
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179 flavor data
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180 default_value 0
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181 description "
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182 This package requires a certain amount of RAM to use as a
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183 page buffer from time to time. This value is the
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184 size of that buffer. You should not normally require to
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185 edit this; it is affected by whichever NAND chip driver
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186 packages are present."
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187 }
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188
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189 cdl_option CYGNUM_NAND_MAX_READ_RETRIES {
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190 display "Automatic read retry limit"
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191 flavor data
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192 default_value 2
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193 description "
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194 Typical NAND chips may exhibit occasional bit errors,
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195 which may be transient. This library implements
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196 an Error Correcting Code in order to detect and
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197 automatically repair these. If you are unlucky,
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198 a combination of errors may cause an indication of
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199 an uncorrectable error, which would normally be returned to
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200 the caller as EIO. This setting causes the library
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201 to automatically retry a read, up to this many times,
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202 in the hope that the error is transient;
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203 set to 0 if you wish to disable this behaviour."
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204 }
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205
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206 cdl_option CYGNUM_NAND_MAX_PARTITIONS {
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207 display "Maximum number of partitions on a NAND chip"
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208 flavor data
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209 default_value 4
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210 legal_values 1 to 0x7fffffff
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211 description "
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212 Within every NAND device there are one or more logical partitions,
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213 akin to partitions on a hard drive. This setting is the
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214 largest number of partitions that the NAND library and
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215 drivers will support. The default, 4, should be enough for
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216 most purposes. (Higher settings consume more RAM at runtime.)
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217
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218 N.B. This setting does not configure how partitions are defined;
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219 that is set up in the platform HAL."
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220 }
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221
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222 # We do not currently provide CDL options to switch the choice of
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223 # ECC algorithm, OOB area layout and BBT semantics on and off.
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224 # This could easily be added in future if there was a demand for it.
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225 # Bear in mind that as well as conditioning the code in/out, each
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226 # chip instance must select its own semantics individually (in case
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227 # of multiple devices with different requirements), so there may
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228 # well not be a need for a top-level switch.
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229
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230 cdl_option CYGPKG_IO_NAND_TESTS {
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231 display "NAND library tests"
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232 flavor data
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233 no_define
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234 calculated { "tests/nandunit tests/readlimits tests/readwrite tests/rwbenchmark" }
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235 description "
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236 This option specifies the set of tests for the NAND library."
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237 }
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238
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239 }