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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 | ||
673d29f9 JM |
31 | to see the new config symbols or you can use diffconfig to see the |
32 | differences between the previous and new .config files: | |
2af238e4 | 33 | |
673d29f9 | 34 | scripts/diffconfig .config.old .config | less |
2af238e4 | 35 | |
2af238e4 | 36 | ______________________________________________________________________ |
98f540d3 | 37 | Environment variables for '*config' |
2af238e4 | 38 | |
98f540d3 MH |
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". | |
2af238e4 | 43 | |
98f540d3 MH |
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. | |
2af238e4 | 48 | |
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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 | ||
2af238e4 | 55 | ______________________________________________________________________ |
98f540d3 | 56 | Environment variables for '{allyes/allmod/allno/rand}config' |
2af238e4 RD |
57 | |
58 | KCONFIG_ALLCONFIG | |
59 | -------------------------------------------------- | |
60 | (partially based on lkml email from/by Rob Landley, re: miniconfig) | |
61 | -------------------------------------------------- | |
5efe241e EB |
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. | |
2af238e4 RD |
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, | |
98f540d3 | 75 | including symbols of your miniconfig file. |
2af238e4 RD |
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 | ||
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92 | ______________________________________________________________________ |
93 | Environment variables for 'randconfig' | |
94 | ||
95 | KCONFIG_SEED | |
96 | -------------------------------------------------- | |
97 | You can set this to the integer value used to seed the RNG, if you want | |
98 | to somehow debug the behaviour of the kconfig parser/frontends. | |
99 | If not set, the current time will be used. | |
100 | ||
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101 | KCONFIG_PROBABILITY |
102 | -------------------------------------------------- | |
103 | This variable can be used to skew the probabilities. This variable can | |
104 | be unset or empty, or set to three different formats: | |
105 | KCONFIG_PROBABILITY y:n split y:m:n split | |
106 | ----------------------------------------------------------------- | |
107 | unset or empty 50 : 50 33 : 33 : 34 | |
108 | N N : 100-N N/2 : N/2 : 100-N | |
109 | [1] N:M N+M : 100-(N+M) N : M : 100-(N+M) | |
110 | [2] N:M:L N : 100-N M : L : 100-(M+L) | |
111 | ||
112 | where N, M and L are integers (in base 10) in the range [0,100], and so | |
113 | that: | |
114 | [1] N+M is in the range [0,100] | |
115 | [2] M+L is in the range [0,100] | |
116 | ||
117 | Examples: | |
118 | KCONFIG_PROBABILITY=10 | |
119 | 10% of booleans will be set to 'y', 90% to 'n' | |
120 | 5% of tristates will be set to 'y', 5% to 'm', 90% to 'n' | |
121 | KCONFIG_PROBABILITY=15:25 | |
122 | 40% of booleans will be set to 'y', 60% to 'n' | |
123 | 15% of tristates will be set to 'y', 25% to 'm', 60% to 'n' | |
124 | KCONFIG_PROBABILITY=10:15:15 | |
125 | 10% of booleans will be set to 'y', 90% to 'n' | |
126 | 15% of tristates will be set to 'y', 15% to 'm', 70% to 'n' | |
127 | ||
98f540d3 MH |
128 | ______________________________________________________________________ |
129 | Environment variables for 'silentoldconfig' | |
130 | ||
2af238e4 RD |
131 | KCONFIG_NOSILENTUPDATE |
132 | -------------------------------------------------- | |
133 | If this variable has a non-blank value, it prevents silent kernel | |
88393161 | 134 | config updates (requires explicit updates). |
2af238e4 | 135 | |
2af238e4 RD |
136 | KCONFIG_AUTOCONFIG |
137 | -------------------------------------------------- | |
138 | This environment variable can be set to specify the path & name of the | |
139 | "auto.conf" file. Its default value is "include/config/auto.conf". | |
140 | ||
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141 | KCONFIG_TRISTATE |
142 | -------------------------------------------------- | |
143 | This environment variable can be set to specify the path & name of the | |
144 | "tristate.conf" file. Its default value is "include/config/tristate.conf". | |
145 | ||
2af238e4 RD |
146 | KCONFIG_AUTOHEADER |
147 | -------------------------------------------------- | |
148 | This environment variable can be set to specify the path & name of the | |
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149 | "autoconf.h" (header) file. |
150 | Its default value is "include/generated/autoconf.h". | |
2af238e4 | 151 | |
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152 | |
153 | ====================================================================== | |
154 | menuconfig | |
155 | -------------------------------------------------- | |
156 | ||
157 | SEARCHING for CONFIG symbols | |
158 | ||
159 | Searching in menuconfig: | |
160 | ||
161 | The Search function searches for kernel configuration symbol | |
162 | names, so you have to know something close to what you are | |
163 | looking for. | |
164 | ||
165 | Example: | |
166 | /hotplug | |
167 | This lists all config symbols that contain "hotplug", | |
40b31360 | 168 | e.g., HOTPLUG_CPU, MEMORY_HOTPLUG. |
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169 | |
170 | For search help, enter / followed TAB-TAB-TAB (to highlight | |
171 | <Help>) and Enter. This will tell you that you can also use | |
172 | regular expressions (regexes) in the search string, so if you | |
173 | are not interested in MEMORY_HOTPLUG, you could try | |
174 | ||
175 | /^hotplug | |
176 | ||
193b40ae | 177 | When searching, symbols are sorted thus: |
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178 | - first, exact matches, sorted alphabetically (an exact match |
179 | is when the search matches the complete symbol name); | |
180 | - then, other matches, sorted alphabetically. | |
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181 | For example: ^ATH.K matches: |
182 | ATH5K ATH9K ATH5K_AHB ATH5K_DEBUG [...] ATH6KL ATH6KL_DEBUG | |
183 | [...] ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_COMMON [...] | |
184 | of which only ATH5K and ATH9K match exactly and so are sorted | |
185 | first (and in alphabetical order), then come all other symbols, | |
186 | sorted in alphabetical order. | |
187 | ||
2af238e4 | 188 | ______________________________________________________________________ |
98f540d3 MH |
189 | User interface options for 'menuconfig' |
190 | ||
191 | MENUCONFIG_COLOR | |
192 | -------------------------------------------------- | |
193 | It is possible to select different color themes using the variable | |
194 | MENUCONFIG_COLOR. To select a theme use: | |
195 | ||
196 | make MENUCONFIG_COLOR=<theme> menuconfig | |
197 | ||
198 | Available themes are: | |
199 | mono => selects colors suitable for monochrome displays | |
200 | blackbg => selects a color scheme with black background | |
201 | classic => theme with blue background. The classic look | |
202 | bluetitle => a LCD friendly version of classic. (default) | |
203 | ||
2af238e4 RD |
204 | MENUCONFIG_MODE |
205 | -------------------------------------------------- | |
206 | This mode shows all sub-menus in one large tree. | |
207 | ||
208 | Example: | |
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209 | make MENUCONFIG_MODE=single_menu menuconfig |
210 | ||
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211 | |
212 | ====================================================================== | |
213 | xconfig | |
214 | -------------------------------------------------- | |
215 | ||
216 | Searching in xconfig: | |
217 | ||
218 | The Search function searches for kernel configuration symbol | |
219 | names, so you have to know something close to what you are | |
220 | looking for. | |
221 | ||
222 | Example: | |
223 | Ctrl-F hotplug | |
224 | or | |
225 | Menu: File, Search, hotplug | |
226 | ||
227 | lists all config symbol entries that contain "hotplug" in | |
228 | the symbol name. In this Search dialog, you may change the | |
229 | config setting for any of the entries that are not grayed out. | |
230 | You can also enter a different search string without having | |
231 | to return to the main menu. | |
232 | ||
233 | ||
234 | ====================================================================== | |
235 | gconfig | |
236 | -------------------------------------------------- | |
237 | ||
238 | Searching in gconfig: | |
239 | ||
240 | None (gconfig isn't maintained as well as xconfig or menuconfig); | |
241 | however, gconfig does have a few more viewing choices than | |
242 | xconfig does. | |
243 | ||
244 | ### |