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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 | ||
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 | ||
2af238e4 | 38 | ______________________________________________________________________ |
98f540d3 | 39 | Environment variables for '*config' |
2af238e4 | 40 | |
98f540d3 MH |
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". | |
2af238e4 | 45 | |
98f540d3 MH |
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. | |
2af238e4 | 50 | |
98f540d3 MH |
51 | KCONFIG_NOTIMESTAMP |
52 | -------------------------------------------------- | |
53 | If this environment variable exists and is non-null, the timestamp line | |
54 | in generated .config files is omitted. | |
2af238e4 RD |
55 | |
56 | ______________________________________________________________________ | |
98f540d3 | 57 | Environment variables for '{allyes/allmod/allno/rand}config' |
2af238e4 RD |
58 | |
59 | KCONFIG_ALLCONFIG | |
60 | -------------------------------------------------- | |
61 | (partially based on lkml email from/by Rob Landley, re: miniconfig) | |
62 | -------------------------------------------------- | |
63 | The allyesconfig/allmodconfig/allnoconfig/randconfig variants can | |
64 | also use the environment variable KCONFIG_ALLCONFIG as a flag or a | |
65 | filename that contains config symbols that the user requires to be | |
66 | set to a specific value. If KCONFIG_ALLCONFIG is used without a | |
67 | filename, "make *config" checks for a file named | |
68 | "all{yes/mod/no/random}.config" (corresponding to the *config command | |
69 | that was used) for symbol values that are to be forced. If this file | |
70 | is not found, it checks for a file named "all.config" to contain forced | |
71 | values. | |
72 | ||
73 | This enables you to create "miniature" config (miniconfig) or custom | |
74 | config files containing just the config symbols that you are interested | |
75 | in. Then the kernel config system generates the full .config file, | |
98f540d3 | 76 | including symbols of your miniconfig file. |
2af238e4 RD |
77 | |
78 | This 'KCONFIG_ALLCONFIG' file is a config file which contains | |
79 | (usually a subset of all) preset config symbols. These variable | |
80 | settings are still subject to normal dependency checks. | |
81 | ||
82 | Examples: | |
83 | KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig | |
84 | or | |
85 | KCONFIG_ALLCONFIG=mini.config make allnoconfig | |
86 | or | |
87 | make KCONFIG_ALLCONFIG=mini.config allnoconfig | |
88 | ||
89 | These examples will disable most options (allnoconfig) but enable or | |
90 | disable the options that are explicitly listed in the specified | |
91 | mini-config files. | |
92 | ||
98f540d3 MH |
93 | ______________________________________________________________________ |
94 | Environment variables for 'silentoldconfig' | |
95 | ||
2af238e4 RD |
96 | KCONFIG_NOSILENTUPDATE |
97 | -------------------------------------------------- | |
98 | If this variable has a non-blank value, it prevents silent kernel | |
99 | config udpates (requires explicit updates). | |
100 | ||
2af238e4 RD |
101 | KCONFIG_AUTOCONFIG |
102 | -------------------------------------------------- | |
103 | This environment variable can be set to specify the path & name of the | |
104 | "auto.conf" file. Its default value is "include/config/auto.conf". | |
105 | ||
bc081dd6 MM |
106 | KCONFIG_TRISTATE |
107 | -------------------------------------------------- | |
108 | This environment variable can be set to specify the path & name of the | |
109 | "tristate.conf" file. Its default value is "include/config/tristate.conf". | |
110 | ||
2af238e4 RD |
111 | KCONFIG_AUTOHEADER |
112 | -------------------------------------------------- | |
113 | This environment variable can be set to specify the path & name of the | |
264a2683 SR |
114 | "autoconf.h" (header) file. |
115 | Its default value is "include/generated/autoconf.h". | |
2af238e4 | 116 | |
98f540d3 MH |
117 | |
118 | ====================================================================== | |
119 | menuconfig | |
120 | -------------------------------------------------- | |
121 | ||
122 | SEARCHING for CONFIG symbols | |
123 | ||
124 | Searching in menuconfig: | |
125 | ||
126 | The Search function searches for kernel configuration symbol | |
127 | names, so you have to know something close to what you are | |
128 | looking for. | |
129 | ||
130 | Example: | |
131 | /hotplug | |
132 | This lists all config symbols that contain "hotplug", | |
133 | e.g., HOTPLUG, HOTPLUG_CPU, MEMORY_HOTPLUG. | |
134 | ||
135 | For search help, enter / followed TAB-TAB-TAB (to highlight | |
136 | <Help>) and Enter. This will tell you that you can also use | |
137 | regular expressions (regexes) in the search string, so if you | |
138 | are not interested in MEMORY_HOTPLUG, you could try | |
139 | ||
140 | /^hotplug | |
141 | ||
2af238e4 | 142 | ______________________________________________________________________ |
98f540d3 MH |
143 | User interface options for 'menuconfig' |
144 | ||
145 | MENUCONFIG_COLOR | |
146 | -------------------------------------------------- | |
147 | It is possible to select different color themes using the variable | |
148 | MENUCONFIG_COLOR. To select a theme use: | |
149 | ||
150 | make MENUCONFIG_COLOR=<theme> menuconfig | |
151 | ||
152 | Available themes are: | |
153 | mono => selects colors suitable for monochrome displays | |
154 | blackbg => selects a color scheme with black background | |
155 | classic => theme with blue background. The classic look | |
156 | bluetitle => a LCD friendly version of classic. (default) | |
157 | ||
2af238e4 RD |
158 | MENUCONFIG_MODE |
159 | -------------------------------------------------- | |
160 | This mode shows all sub-menus in one large tree. | |
161 | ||
162 | Example: | |
98f540d3 MH |
163 | make MENUCONFIG_MODE=single_menu menuconfig |
164 | ||
2af238e4 RD |
165 | |
166 | ====================================================================== | |
167 | xconfig | |
168 | -------------------------------------------------- | |
169 | ||
170 | Searching in xconfig: | |
171 | ||
172 | The Search function searches for kernel configuration symbol | |
173 | names, so you have to know something close to what you are | |
174 | looking for. | |
175 | ||
176 | Example: | |
177 | Ctrl-F hotplug | |
178 | or | |
179 | Menu: File, Search, hotplug | |
180 | ||
181 | lists all config symbol entries that contain "hotplug" in | |
182 | the symbol name. In this Search dialog, you may change the | |
183 | config setting for any of the entries that are not grayed out. | |
184 | You can also enter a different search string without having | |
185 | to return to the main menu. | |
186 | ||
187 | ||
188 | ====================================================================== | |
189 | gconfig | |
190 | -------------------------------------------------- | |
191 | ||
192 | Searching in gconfig: | |
193 | ||
194 | None (gconfig isn't maintained as well as xconfig or menuconfig); | |
195 | however, gconfig does have a few more viewing choices than | |
196 | xconfig does. | |
197 | ||
198 | ### |