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1 | =================== |
2 | Kconfig make config | |
3 | =================== | |
4 | ||
5 | This file contains some assistance for using `make *config`. | |
2af238e4 RD |
6 | |
7 | Use "make help" to list all of the possible configuration targets. | |
8 | ||
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9 | The xconfig ('qconf'), menuconfig ('mconf'), and nconfig ('nconf') |
10 | programs also have embedded help text. Be sure to check that for | |
11 | navigation, search, and other general help text. | |
2af238e4 | 12 | |
2af238e4 | 13 | General |
cd238eff | 14 | ------- |
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15 | |
16 | New kernel releases often introduce new config symbols. Often more | |
17 | important, new kernel releases may rename config symbols. When | |
18 | this happens, using a previously working .config file and running | |
19 | "make oldconfig" won't necessarily produce a working new kernel | |
20 | for you, so you may find that you need to see what NEW kernel | |
21 | symbols have been introduced. | |
22 | ||
cd238eff | 23 | To see a list of new config symbols, use:: |
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24 | |
25 | cp user/some/old.config .config | |
560909d4 | 26 | make listnewconfig |
2af238e4 | 27 | |
560909d4 | 28 | and the config program will list any new symbols, one per line. |
2af238e4 | 29 | |
cd238eff | 30 | Alternatively, you can use the brute force method:: |
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31 | |
32 | make oldconfig | |
673d29f9 | 33 | scripts/diffconfig .config.old .config | less |
2af238e4 | 34 | |
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35 | ---------------------------------------------------------------------- |
36 | ||
37 | Environment variables for `*config` | |
2af238e4 | 38 | |
98f540d3 | 39 | KCONFIG_CONFIG |
cd238eff | 40 | -------------- |
98f540d3 MH |
41 | This environment variable can be used to specify a default kernel config |
42 | file name to override the default name of ".config". | |
2af238e4 | 43 | |
98f540d3 | 44 | KCONFIG_OVERWRITECONFIG |
cd238eff | 45 | ----------------------- |
98f540d3 MH |
46 | If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not |
47 | break symlinks when .config is a symlink to somewhere else. | |
2af238e4 | 48 | |
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49 | `CONFIG_` |
50 | --------- | |
51 | If you set `CONFIG_` in the environment, Kconfig will prefix all symbols | |
16974326 | 52 | with its value when saving the configuration, instead of using the default, |
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53 | `CONFIG_`. |
54 | ||
55 | ---------------------------------------------------------------------- | |
16974326 | 56 | |
98f540d3 | 57 | Environment variables for '{allyes/allmod/allno/rand}config' |
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58 | |
59 | KCONFIG_ALLCONFIG | |
cd238eff | 60 | ----------------- |
2af238e4 | 61 | (partially based on lkml email from/by Rob Landley, re: miniconfig) |
cd238eff | 62 | |
2af238e4 | 63 | -------------------------------------------------- |
cd238eff | 64 | |
5efe241e EB |
65 | The allyesconfig/allmodconfig/allnoconfig/randconfig variants can also |
66 | use the environment variable KCONFIG_ALLCONFIG as a flag or a filename | |
67 | that contains config symbols that the user requires to be set to a | |
68 | specific value. If KCONFIG_ALLCONFIG is used without a filename where | |
cd238eff | 69 | KCONFIG_ALLCONFIG == "" or KCONFIG_ALLCONFIG == "1", `make *config` |
5efe241e | 70 | checks for a file named "all{yes/mod/no/def/random}.config" |
cd238eff | 71 | (corresponding to the `*config` command that was used) for symbol values |
5efe241e EB |
72 | that are to be forced. If this file is not found, it checks for a |
73 | file named "all.config" to contain forced values. | |
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74 | |
75 | This enables you to create "miniature" config (miniconfig) or custom | |
76 | config files containing just the config symbols that you are interested | |
77 | in. Then the kernel config system generates the full .config file, | |
98f540d3 | 78 | including symbols of your miniconfig file. |
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79 | |
80 | This 'KCONFIG_ALLCONFIG' file is a config file which contains | |
81 | (usually a subset of all) preset config symbols. These variable | |
82 | settings are still subject to normal dependency checks. | |
83 | ||
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84 | Examples:: |
85 | ||
2af238e4 | 86 | KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig |
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87 | |
88 | or:: | |
89 | ||
2af238e4 | 90 | KCONFIG_ALLCONFIG=mini.config make allnoconfig |
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91 | |
92 | or:: | |
93 | ||
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94 | make KCONFIG_ALLCONFIG=mini.config allnoconfig |
95 | ||
96 | These examples will disable most options (allnoconfig) but enable or | |
97 | disable the options that are explicitly listed in the specified | |
98 | mini-config files. | |
99 | ||
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100 | ---------------------------------------------------------------------- |
101 | ||
0d8024c6 YM |
102 | Environment variables for 'randconfig' |
103 | ||
104 | KCONFIG_SEED | |
cd238eff | 105 | ------------ |
0d8024c6 YM |
106 | You can set this to the integer value used to seed the RNG, if you want |
107 | to somehow debug the behaviour of the kconfig parser/frontends. | |
108 | If not set, the current time will be used. | |
109 | ||
e43956e6 | 110 | KCONFIG_PROBABILITY |
cd238eff | 111 | ------------------- |
e43956e6 YM |
112 | This variable can be used to skew the probabilities. This variable can |
113 | be unset or empty, or set to three different formats: | |
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114 | |
115 | ======================= ================== ===================== | |
e43956e6 | 116 | KCONFIG_PROBABILITY y:n split y:m:n split |
cd238eff | 117 | ======================= ================== ===================== |
e43956e6 YM |
118 | unset or empty 50 : 50 33 : 33 : 34 |
119 | N N : 100-N N/2 : N/2 : 100-N | |
120 | [1] N:M N+M : 100-(N+M) N : M : 100-(N+M) | |
121 | [2] N:M:L N : 100-N M : L : 100-(M+L) | |
cd238eff | 122 | ======================= ================== ===================== |
e43956e6 YM |
123 | |
124 | where N, M and L are integers (in base 10) in the range [0,100], and so | |
125 | that: | |
cd238eff | 126 | |
e43956e6 | 127 | [1] N+M is in the range [0,100] |
cd238eff | 128 | |
e43956e6 YM |
129 | [2] M+L is in the range [0,100] |
130 | ||
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131 | Examples:: |
132 | ||
e43956e6 YM |
133 | KCONFIG_PROBABILITY=10 |
134 | 10% of booleans will be set to 'y', 90% to 'n' | |
135 | 5% of tristates will be set to 'y', 5% to 'm', 90% to 'n' | |
136 | KCONFIG_PROBABILITY=15:25 | |
137 | 40% of booleans will be set to 'y', 60% to 'n' | |
138 | 15% of tristates will be set to 'y', 25% to 'm', 60% to 'n' | |
139 | KCONFIG_PROBABILITY=10:15:15 | |
140 | 10% of booleans will be set to 'y', 90% to 'n' | |
141 | 15% of tristates will be set to 'y', 15% to 'm', 70% to 'n' | |
142 | ||
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143 | ---------------------------------------------------------------------- |
144 | ||
911a91c3 | 145 | Environment variables for 'syncconfig' |
98f540d3 | 146 | |
2af238e4 | 147 | KCONFIG_NOSILENTUPDATE |
cd238eff | 148 | ---------------------- |
2af238e4 | 149 | If this variable has a non-blank value, it prevents silent kernel |
88393161 | 150 | config updates (requires explicit updates). |
2af238e4 | 151 | |
2af238e4 | 152 | KCONFIG_AUTOCONFIG |
cd238eff | 153 | ------------------ |
2af238e4 RD |
154 | This environment variable can be set to specify the path & name of the |
155 | "auto.conf" file. Its default value is "include/config/auto.conf". | |
156 | ||
157 | KCONFIG_AUTOHEADER | |
cd238eff | 158 | ------------------ |
2af238e4 | 159 | This environment variable can be set to specify the path & name of the |
264a2683 SR |
160 | "autoconf.h" (header) file. |
161 | Its default value is "include/generated/autoconf.h". | |
2af238e4 | 162 | |
98f540d3 | 163 | |
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164 | ---------------------------------------------------------------------- |
165 | ||
98f540d3 | 166 | menuconfig |
cd238eff | 167 | ---------- |
98f540d3 MH |
168 | |
169 | SEARCHING for CONFIG symbols | |
170 | ||
171 | Searching in menuconfig: | |
172 | ||
173 | The Search function searches for kernel configuration symbol | |
174 | names, so you have to know something close to what you are | |
175 | looking for. | |
176 | ||
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177 | Example:: |
178 | ||
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179 | /hotplug |
180 | This lists all config symbols that contain "hotplug", | |
40b31360 | 181 | e.g., HOTPLUG_CPU, MEMORY_HOTPLUG. |
98f540d3 | 182 | |
452d4c86 | 183 | For search help, enter / followed by TAB-TAB (to highlight |
98f540d3 MH |
184 | <Help>) and Enter. This will tell you that you can also use |
185 | regular expressions (regexes) in the search string, so if you | |
cd238eff | 186 | are not interested in MEMORY_HOTPLUG, you could try:: |
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187 | |
188 | /^hotplug | |
189 | ||
193b40ae | 190 | When searching, symbols are sorted thus: |
cd238eff | 191 | |
9e554dd7 YM |
192 | - first, exact matches, sorted alphabetically (an exact match |
193 | is when the search matches the complete symbol name); | |
194 | - then, other matches, sorted alphabetically. | |
cd238eff | 195 | |
193b40ae | 196 | For example: ^ATH.K matches: |
cd238eff | 197 | |
193b40ae YM |
198 | ATH5K ATH9K ATH5K_AHB ATH5K_DEBUG [...] ATH6KL ATH6KL_DEBUG |
199 | [...] ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_COMMON [...] | |
cd238eff | 200 | |
193b40ae YM |
201 | of which only ATH5K and ATH9K match exactly and so are sorted |
202 | first (and in alphabetical order), then come all other symbols, | |
203 | sorted in alphabetical order. | |
204 | ||
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205 | ---------------------------------------------------------------------- |
206 | ||
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207 | User interface options for 'menuconfig' |
208 | ||
209 | MENUCONFIG_COLOR | |
cd238eff | 210 | ---------------- |
98f540d3 | 211 | It is possible to select different color themes using the variable |
cd238eff | 212 | MENUCONFIG_COLOR. To select a theme use:: |
98f540d3 MH |
213 | |
214 | make MENUCONFIG_COLOR=<theme> menuconfig | |
215 | ||
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216 | Available themes are:: |
217 | ||
218 | - mono => selects colors suitable for monochrome displays | |
219 | - blackbg => selects a color scheme with black background | |
220 | - classic => theme with blue background. The classic look | |
221 | - bluetitle => a LCD friendly version of classic. (default) | |
98f540d3 | 222 | |
2af238e4 | 223 | MENUCONFIG_MODE |
cd238eff | 224 | --------------- |
2af238e4 RD |
225 | This mode shows all sub-menus in one large tree. |
226 | ||
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227 | Example:: |
228 | ||
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229 | make MENUCONFIG_MODE=single_menu menuconfig |
230 | ||
cd238eff | 231 | ---------------------------------------------------------------------- |
2af238e4 | 232 | |
452d4c86 | 233 | nconfig |
cd238eff | 234 | ------- |
452d4c86 RD |
235 | |
236 | nconfig is an alternate text-based configurator. It lists function | |
237 | keys across the bottom of the terminal (window) that execute commands. | |
238 | You can also just use the corresponding numeric key to execute the | |
239 | commands unless you are in a data entry window. E.g., instead of F6 | |
240 | for Save, you can just press 6. | |
241 | ||
242 | Use F1 for Global help or F3 for the Short help menu. | |
243 | ||
244 | Searching in nconfig: | |
245 | ||
246 | You can search either in the menu entry "prompt" strings | |
247 | or in the configuration symbols. | |
248 | ||
249 | Use / to begin a search through the menu entries. This does | |
250 | not support regular expressions. Use <Down> or <Up> for | |
251 | Next hit and Previous hit, respectively. Use <Esc> to | |
252 | terminate the search mode. | |
253 | ||
254 | F8 (SymSearch) searches the configuration symbols for the | |
255 | given string or regular expression (regex). | |
256 | ||
257 | NCONFIG_MODE | |
cd238eff | 258 | ------------ |
452d4c86 RD |
259 | This mode shows all sub-menus in one large tree. |
260 | ||
cd238eff | 261 | Example:: |
16886949 | 262 | |
452d4c86 RD |
263 | make NCONFIG_MODE=single_menu nconfig |
264 | ||
cd238eff | 265 | ---------------------------------------------------------------------- |
452d4c86 | 266 | |
2af238e4 | 267 | xconfig |
cd238eff | 268 | ------- |
2af238e4 RD |
269 | |
270 | Searching in xconfig: | |
271 | ||
272 | The Search function searches for kernel configuration symbol | |
273 | names, so you have to know something close to what you are | |
274 | looking for. | |
275 | ||
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276 | Example:: |
277 | ||
2af238e4 | 278 | Ctrl-F hotplug |
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279 | |
280 | or:: | |
281 | ||
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282 | Menu: File, Search, hotplug |
283 | ||
284 | lists all config symbol entries that contain "hotplug" in | |
285 | the symbol name. In this Search dialog, you may change the | |
286 | config setting for any of the entries that are not grayed out. | |
287 | You can also enter a different search string without having | |
288 | to return to the main menu. | |
289 | ||
290 | ||
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291 | ---------------------------------------------------------------------- |
292 | ||
2af238e4 | 293 | gconfig |
cd238eff | 294 | ------- |
2af238e4 RD |
295 | |
296 | Searching in gconfig: | |
297 | ||
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298 | There is no search command in gconfig. However, gconfig does |
299 | have several different viewing choices, modes, and options. |