Documentation / kbuild / kconfig.txt
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Based on kernel version 3.3. Page generated on 2012-03-23 21:34 EST.
1 This file contains some assistance for using "make *config". 2 3 Use "make help" to list all of the possible configuration targets. 4 5 The xconfig ('qconf') and menuconfig ('mconf') programs also 6 have embedded help text. Be sure to check it for navigation, 7 search, and other general help text. 8 9 ====================================================================== 10 General 11 -------------------------------------------------- 12 13 New kernel releases often introduce new config symbols. Often more 14 important, new kernel releases may rename config symbols. When 15 this happens, using a previously working .config file and running 16 "make oldconfig" won't necessarily produce a working new kernel 17 for you, so you may find that you need to see what NEW kernel 18 symbols have been introduced. 19 20 To see a list of new config symbols when using "make oldconfig", use 21 22 cp user/some/old.config .config 23 yes "" | make oldconfig >conf.new 24 25 and the config program will list as (NEW) any new symbols that have 26 unknown values. Of course, the .config file is also updated with 27 new (default) values, so you can use: 28 29 grep "(NEW)" conf.new 30 31 to see the new config symbols or you can 'diff' the previous and 32 new .config files to see the differences: 33 34 diff .config.old .config | less 35 36 (Yes, we need something better here.) 37 38 ______________________________________________________________________ 39 Environment variables for '*config' 40 41 KCONFIG_CONFIG 42 -------------------------------------------------- 43 This environment variable can be used to specify a default kernel config 44 file name to override the default name of ".config". 45 46 KCONFIG_OVERWRITECONFIG 47 -------------------------------------------------- 48 If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not 49 break symlinks when .config is a symlink to somewhere else. 50 51 ______________________________________________________________________ 52 Environment variables for '{allyes/allmod/allno/rand}config' 53 54 KCONFIG_ALLCONFIG 55 -------------------------------------------------- 56 (partially based on lkml email from/by Rob Landley, re: miniconfig) 57 -------------------------------------------------- 58 The allyesconfig/allmodconfig/allnoconfig/randconfig variants can 59 also use the environment variable KCONFIG_ALLCONFIG as a flag or a 60 filename that contains config symbols that the user requires to be 61 set to a specific value. If KCONFIG_ALLCONFIG is used without a 62 filename, "make *config" checks for a file named 63 "all{yes/mod/no/def/random}.config" (corresponding to the *config command 64 that was used) for symbol values that are to be forced. If this file 65 is not found, it checks for a file named "all.config" to contain forced 66 values. 67 68 This enables you to create "miniature" config (miniconfig) or custom 69 config files containing just the config symbols that you are interested 70 in. Then the kernel config system generates the full .config file, 71 including symbols of your miniconfig file. 72 73 This 'KCONFIG_ALLCONFIG' file is a config file which contains 74 (usually a subset of all) preset config symbols. These variable 75 settings are still subject to normal dependency checks. 76 77 Examples: 78 KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig 79 or 80 KCONFIG_ALLCONFIG=mini.config make allnoconfig 81 or 82 make KCONFIG_ALLCONFIG=mini.config allnoconfig 83 84 These examples will disable most options (allnoconfig) but enable or 85 disable the options that are explicitly listed in the specified 86 mini-config files. 87 88 ______________________________________________________________________ 89 Environment variables for 'silentoldconfig' 90 91 KCONFIG_NOSILENTUPDATE 92 -------------------------------------------------- 93 If this variable has a non-blank value, it prevents silent kernel 94 config updates (requires explicit updates). 95 96 KCONFIG_AUTOCONFIG 97 -------------------------------------------------- 98 This environment variable can be set to specify the path & name of the 99 "auto.conf" file. Its default value is "include/config/auto.conf". 100 101 KCONFIG_TRISTATE 102 -------------------------------------------------- 103 This environment variable can be set to specify the path & name of the 104 "tristate.conf" file. Its default value is "include/config/tristate.conf". 105 106 KCONFIG_AUTOHEADER 107 -------------------------------------------------- 108 This environment variable can be set to specify the path & name of the 109 "autoconf.h" (header) file. 110 Its default value is "include/generated/autoconf.h". 111 112 113 ====================================================================== 114 menuconfig 115 -------------------------------------------------- 116 117 SEARCHING for CONFIG symbols 118 119 Searching in menuconfig: 120 121 The Search function searches for kernel configuration symbol 122 names, so you have to know something close to what you are 123 looking for. 124 125 Example: 126 /hotplug 127 This lists all config symbols that contain "hotplug", 128 e.g., HOTPLUG, HOTPLUG_CPU, MEMORY_HOTPLUG. 129 130 For search help, enter / followed TAB-TAB-TAB (to highlight 131 <Help>) and Enter. This will tell you that you can also use 132 regular expressions (regexes) in the search string, so if you 133 are not interested in MEMORY_HOTPLUG, you could try 134 135 /^hotplug 136 137 ______________________________________________________________________ 138 User interface options for 'menuconfig' 139 140 MENUCONFIG_COLOR 141 -------------------------------------------------- 142 It is possible to select different color themes using the variable 143 MENUCONFIG_COLOR. To select a theme use: 144 145 make MENUCONFIG_COLOR=<theme> menuconfig 146 147 Available themes are: 148 mono => selects colors suitable for monochrome displays 149 blackbg => selects a color scheme with black background 150 classic => theme with blue background. The classic look 151 bluetitle => a LCD friendly version of classic. (default) 152 153 MENUCONFIG_MODE 154 -------------------------------------------------- 155 This mode shows all sub-menus in one large tree. 156 157 Example: 158 make MENUCONFIG_MODE=single_menu menuconfig 159 160 161 ====================================================================== 162 xconfig 163 -------------------------------------------------- 164 165 Searching in xconfig: 166 167 The Search function searches for kernel configuration symbol 168 names, so you have to know something close to what you are 169 looking for. 170 171 Example: 172 Ctrl-F hotplug 173 or 174 Menu: File, Search, hotplug 175 176 lists all config symbol entries that contain "hotplug" in 177 the symbol name. In this Search dialog, you may change the 178 config setting for any of the entries that are not grayed out. 179 You can also enter a different search string without having 180 to return to the main menu. 181 182 183 ====================================================================== 184 gconfig 185 -------------------------------------------------- 186 187 Searching in gconfig: 188 189 None (gconfig isn't maintained as well as xconfig or menuconfig); 190 however, gconfig does have a few more viewing choices than 191 xconfig does. 192 193 ###
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