308 lines
9.4 KiB
ReStructuredText
308 lines
9.4 KiB
ReStructuredText
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===================
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Kconfig make config
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===================
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This file contains some assistance for using `make *config`.
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Use "make help" to list all of the possible configuration targets.
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The xconfig ('qconf'), menuconfig ('mconf'), and nconfig ('nconf')
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programs also have embedded help text. Be sure to check that for
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navigation, search, and other general help text.
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General
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-------
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New kernel releases often introduce new config symbols. Often more
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important, new kernel releases may rename config symbols. When
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this happens, using a previously working .config file and running
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"make oldconfig" won't necessarily produce a working new kernel
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for you, so you may find that you need to see what NEW kernel
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symbols have been introduced.
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To see a list of new config symbols, use::
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cp user/some/old.config .config
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make listnewconfig
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and the config program will list any new symbols, one per line.
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Alternatively, you can use the brute force method::
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make oldconfig
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scripts/diffconfig .config.old .config | less
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----------------------------------------------------------------------
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Environment variables for `*config`
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KCONFIG_CONFIG
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--------------
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This environment variable can be used to specify a default kernel config
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file name to override the default name of ".config".
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KCONFIG_DEFCONFIG_LIST
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----------------------
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This environment variable specifies a list of config files which can be used
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as a base configuration in case the .config does not exist yet. Entries in
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the list are separated with whitespaces to each other, and the first one
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that exists is used.
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KCONFIG_OVERWRITECONFIG
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-----------------------
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If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not
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break symlinks when .config is a symlink to somewhere else.
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`CONFIG_`
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---------
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If you set `CONFIG_` in the environment, Kconfig will prefix all symbols
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with its value when saving the configuration, instead of using the default,
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`CONFIG_`.
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----------------------------------------------------------------------
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Environment variables for '{allyes/allmod/allno/rand}config'
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KCONFIG_ALLCONFIG
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-----------------
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(partially based on lkml email from/by Rob Landley, re: miniconfig)
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--------------------------------------------------
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The allyesconfig/allmodconfig/allnoconfig/randconfig variants can also
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use the environment variable KCONFIG_ALLCONFIG as a flag or a filename
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that contains config symbols that the user requires to be set to a
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specific value. If KCONFIG_ALLCONFIG is used without a filename where
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KCONFIG_ALLCONFIG == "" or KCONFIG_ALLCONFIG == "1", `make *config`
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checks for a file named "all{yes/mod/no/def/random}.config"
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(corresponding to the `*config` command that was used) for symbol values
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that are to be forced. If this file is not found, it checks for a
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file named "all.config" to contain forced values.
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This enables you to create "miniature" config (miniconfig) or custom
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config files containing just the config symbols that you are interested
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in. Then the kernel config system generates the full .config file,
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including symbols of your miniconfig file.
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This 'KCONFIG_ALLCONFIG' file is a config file which contains
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(usually a subset of all) preset config symbols. These variable
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settings are still subject to normal dependency checks.
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Examples::
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KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig
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or::
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KCONFIG_ALLCONFIG=mini.config make allnoconfig
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or::
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make KCONFIG_ALLCONFIG=mini.config allnoconfig
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These examples will disable most options (allnoconfig) but enable or
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disable the options that are explicitly listed in the specified
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mini-config files.
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----------------------------------------------------------------------
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Environment variables for 'randconfig'
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KCONFIG_SEED
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------------
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You can set this to the integer value used to seed the RNG, if you want
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to somehow debug the behaviour of the kconfig parser/frontends.
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If not set, the current time will be used.
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KCONFIG_PROBABILITY
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-------------------
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This variable can be used to skew the probabilities. This variable can
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be unset or empty, or set to three different formats:
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======================= ================== =====================
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KCONFIG_PROBABILITY y:n split y:m:n split
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======================= ================== =====================
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unset or empty 50 : 50 33 : 33 : 34
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N N : 100-N N/2 : N/2 : 100-N
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[1] N:M N+M : 100-(N+M) N : M : 100-(N+M)
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[2] N:M:L N : 100-N M : L : 100-(M+L)
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======================= ================== =====================
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where N, M and L are integers (in base 10) in the range [0,100], and so
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that:
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[1] N+M is in the range [0,100]
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[2] M+L is in the range [0,100]
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Examples::
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KCONFIG_PROBABILITY=10
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10% of booleans will be set to 'y', 90% to 'n'
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5% of tristates will be set to 'y', 5% to 'm', 90% to 'n'
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KCONFIG_PROBABILITY=15:25
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40% of booleans will be set to 'y', 60% to 'n'
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15% of tristates will be set to 'y', 25% to 'm', 60% to 'n'
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KCONFIG_PROBABILITY=10:15:15
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10% of booleans will be set to 'y', 90% to 'n'
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15% of tristates will be set to 'y', 15% to 'm', 70% to 'n'
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----------------------------------------------------------------------
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Environment variables for 'syncconfig'
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KCONFIG_NOSILENTUPDATE
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----------------------
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If this variable has a non-blank value, it prevents silent kernel
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config updates (requires explicit updates).
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KCONFIG_AUTOCONFIG
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------------------
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This environment variable can be set to specify the path & name of the
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"auto.conf" file. Its default value is "include/config/auto.conf".
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KCONFIG_AUTOHEADER
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------------------
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This environment variable can be set to specify the path & name of the
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"autoconf.h" (header) file.
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Its default value is "include/generated/autoconf.h".
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----------------------------------------------------------------------
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menuconfig
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----------
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SEARCHING for CONFIG symbols
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Searching in menuconfig:
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The Search function searches for kernel configuration symbol
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names, so you have to know something close to what you are
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looking for.
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Example::
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/hotplug
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This lists all config symbols that contain "hotplug",
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e.g., HOTPLUG_CPU, MEMORY_HOTPLUG.
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For search help, enter / followed by TAB-TAB (to highlight
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<Help>) and Enter. This will tell you that you can also use
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regular expressions (regexes) in the search string, so if you
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are not interested in MEMORY_HOTPLUG, you could try::
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/^hotplug
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When searching, symbols are sorted thus:
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- first, exact matches, sorted alphabetically (an exact match
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is when the search matches the complete symbol name);
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- then, other matches, sorted alphabetically.
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For example: ^ATH.K matches:
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ATH5K ATH9K ATH5K_AHB ATH5K_DEBUG [...] ATH6KL ATH6KL_DEBUG
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[...] ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_COMMON [...]
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of which only ATH5K and ATH9K match exactly and so are sorted
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first (and in alphabetical order), then come all other symbols,
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sorted in alphabetical order.
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----------------------------------------------------------------------
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User interface options for 'menuconfig'
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MENUCONFIG_COLOR
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----------------
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It is possible to select different color themes using the variable
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MENUCONFIG_COLOR. To select a theme use::
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make MENUCONFIG_COLOR=<theme> menuconfig
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Available themes are::
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- mono => selects colors suitable for monochrome displays
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- blackbg => selects a color scheme with black background
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- classic => theme with blue background. The classic look
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- bluetitle => a LCD friendly version of classic. (default)
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MENUCONFIG_MODE
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---------------
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This mode shows all sub-menus in one large tree.
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Example::
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make MENUCONFIG_MODE=single_menu menuconfig
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----------------------------------------------------------------------
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nconfig
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-------
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nconfig is an alternate text-based configurator. It lists function
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keys across the bottom of the terminal (window) that execute commands.
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You can also just use the corresponding numeric key to execute the
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commands unless you are in a data entry window. E.g., instead of F6
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for Save, you can just press 6.
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Use F1 for Global help or F3 for the Short help menu.
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Searching in nconfig:
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You can search either in the menu entry "prompt" strings
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or in the configuration symbols.
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Use / to begin a search through the menu entries. This does
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not support regular expressions. Use <Down> or <Up> for
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Next hit and Previous hit, respectively. Use <Esc> to
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terminate the search mode.
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F8 (SymSearch) searches the configuration symbols for the
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given string or regular expression (regex).
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NCONFIG_MODE
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------------
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This mode shows all sub-menus in one large tree.
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Example::
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make NCONFIG_MODE=single_menu nconfig
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----------------------------------------------------------------------
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xconfig
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-------
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Searching in xconfig:
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The Search function searches for kernel configuration symbol
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names, so you have to know something close to what you are
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looking for.
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Example::
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Ctrl-F hotplug
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or::
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Menu: File, Search, hotplug
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lists all config symbol entries that contain "hotplug" in
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the symbol name. In this Search dialog, you may change the
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config setting for any of the entries that are not grayed out.
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You can also enter a different search string without having
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to return to the main menu.
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----------------------------------------------------------------------
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gconfig
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-------
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Searching in gconfig:
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There is no search command in gconfig. However, gconfig does
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have several different viewing choices, modes, and options.
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