Documentation / kbuild / kconfig.txt
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Based on kernel version 3.9. Page generated on 2013-05-02 23:09 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 use diffconfig to see the 32 differences between the previous and new .config files: 33 34 scripts/diffconfig .config.old .config | less 35 36 ______________________________________________________________________ 37 Environment variables for '*config' 38 39 KCONFIG_CONFIG 40 -------------------------------------------------- 41 This environment variable can be used to specify a default kernel config 42 file name to override the default name of ".config". 43 44 KCONFIG_OVERWRITECONFIG 45 -------------------------------------------------- 46 If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not 47 break symlinks when .config is a symlink to somewhere else. 48 49 CONFIG_ 50 -------------------------------------------------- 51 If you set CONFIG_ in the environment, Kconfig will prefix all symbols 52 with its value when saving the configuration, instead of using the default, 53 "CONFIG_". 54 55 ______________________________________________________________________ 56 Environment variables for '{allyes/allmod/allno/rand}config' 57 58 KCONFIG_ALLCONFIG 59 -------------------------------------------------- 60 (partially based on lkml email from/by Rob Landley, re: miniconfig) 61 -------------------------------------------------- 62 The allyesconfig/allmodconfig/allnoconfig/randconfig variants can also 63 use the environment variable KCONFIG_ALLCONFIG as a flag or a filename 64 that contains config symbols that the user requires to be set to a 65 specific value. If KCONFIG_ALLCONFIG is used without a filename where 66 KCONFIG_ALLCONFIG == "" or KCONFIG_ALLCONFIG == "1", "make *config" 67 checks for a file named "all{yes/mod/no/def/random}.config" 68 (corresponding to the *config command that was used) for symbol values 69 that are to be forced. If this file is not found, it checks for a 70 file named "all.config" to contain forced values. 71 72 This enables you to create "miniature" config (miniconfig) or custom 73 config files containing just the config symbols that you are interested 74 in. Then the kernel config system generates the full .config file, 75 including symbols of your miniconfig file. 76 77 This 'KCONFIG_ALLCONFIG' file is a config file which contains 78 (usually a subset of all) preset config symbols. These variable 79 settings are still subject to normal dependency checks. 80 81 Examples: 82 KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig 83 or 84 KCONFIG_ALLCONFIG=mini.config make allnoconfig 85 or 86 make KCONFIG_ALLCONFIG=mini.config allnoconfig 87 88 These examples will disable most options (allnoconfig) but enable or 89 disable the options that are explicitly listed in the specified 90 mini-config files. 91 92 ______________________________________________________________________ 93 Environment variables for 'silentoldconfig' 94 95 KCONFIG_NOSILENTUPDATE 96 -------------------------------------------------- 97 If this variable has a non-blank value, it prevents silent kernel 98 config updates (requires explicit updates). 99 100 KCONFIG_AUTOCONFIG 101 -------------------------------------------------- 102 This environment variable can be set to specify the path & name of the 103 "auto.conf" file. Its default value is "include/config/auto.conf". 104 105 KCONFIG_TRISTATE 106 -------------------------------------------------- 107 This environment variable can be set to specify the path & name of the 108 "tristate.conf" file. Its default value is "include/config/tristate.conf". 109 110 KCONFIG_AUTOHEADER 111 -------------------------------------------------- 112 This environment variable can be set to specify the path & name of the 113 "autoconf.h" (header) file. 114 Its default value is "include/generated/autoconf.h". 115 116 117 ====================================================================== 118 menuconfig 119 -------------------------------------------------- 120 121 SEARCHING for CONFIG symbols 122 123 Searching in menuconfig: 124 125 The Search function searches for kernel configuration symbol 126 names, so you have to know something close to what you are 127 looking for. 128 129 Example: 130 /hotplug 131 This lists all config symbols that contain "hotplug", 132 e.g., HOTPLUG, HOTPLUG_CPU, MEMORY_HOTPLUG. 133 134 For search help, enter / followed TAB-TAB-TAB (to highlight 135 <Help>) and Enter. This will tell you that you can also use 136 regular expressions (regexes) in the search string, so if you 137 are not interested in MEMORY_HOTPLUG, you could try 138 139 /^hotplug 140 141 ______________________________________________________________________ 142 User interface options for 'menuconfig' 143 144 MENUCONFIG_COLOR 145 -------------------------------------------------- 146 It is possible to select different color themes using the variable 147 MENUCONFIG_COLOR. To select a theme use: 148 149 make MENUCONFIG_COLOR=<theme> menuconfig 150 151 Available themes are: 152 mono => selects colors suitable for monochrome displays 153 blackbg => selects a color scheme with black background 154 classic => theme with blue background. The classic look 155 bluetitle => a LCD friendly version of classic. (default) 156 157 MENUCONFIG_MODE 158 -------------------------------------------------- 159 This mode shows all sub-menus in one large tree. 160 161 Example: 162 make MENUCONFIG_MODE=single_menu menuconfig 163 164 165 ====================================================================== 166 xconfig 167 -------------------------------------------------- 168 169 Searching in xconfig: 170 171 The Search function searches for kernel configuration symbol 172 names, so you have to know something close to what you are 173 looking for. 174 175 Example: 176 Ctrl-F hotplug 177 or 178 Menu: File, Search, hotplug 179 180 lists all config symbol entries that contain "hotplug" in 181 the symbol name. In this Search dialog, you may change the 182 config setting for any of the entries that are not grayed out. 183 You can also enter a different search string without having 184 to return to the main menu. 185 186 187 ====================================================================== 188 gconfig 189 -------------------------------------------------- 190 191 Searching in gconfig: 192 193 None (gconfig isn't maintained as well as xconfig or menuconfig); 194 however, gconfig does have a few more viewing choices than 195 xconfig does. 196 197 ###
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