673d29f9a0
The kconfig documentation suggests using plain 'diff' to compare config
files and then adds "Yes, we need something better here". Commit
a717417e7f ("kconfig: add diffconfig utility") added what that comment
was looking for.
Signed-off-by: Javi Merino <javi.merino@arm.com>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
192 lines
6.6 KiB
Plaintext
192 lines
6.6 KiB
Plaintext
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') and menuconfig ('mconf') programs also
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have embedded help text. Be sure to check it for navigation,
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search, and other general help text.
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======================================================================
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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 when using "make oldconfig", use
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cp user/some/old.config .config
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yes "" | make oldconfig >conf.new
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and the config program will list as (NEW) any new symbols that have
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unknown values. Of course, the .config file is also updated with
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new (default) values, so you can use:
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grep "(NEW)" conf.new
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to see the new config symbols or you can use diffconfig to see the
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differences between the previous and new .config files:
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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_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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______________________________________________________________________
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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
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also use the environment variable KCONFIG_ALLCONFIG as a flag or a
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filename that contains config symbols that the user requires to be
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set to a specific value. If KCONFIG_ALLCONFIG is used without a
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filename, "make *config" checks for a file named
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"all{yes/mod/no/def/random}.config" (corresponding to the *config command
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that was used) for symbol values that are to be forced. If this file
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is not found, it checks for a file named "all.config" to contain forced
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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 'silentoldconfig'
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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_TRISTATE
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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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"tristate.conf" file. Its default value is "include/config/tristate.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, HOTPLUG_CPU, MEMORY_HOTPLUG.
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For search help, enter / followed TAB-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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______________________________________________________________________
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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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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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None (gconfig isn't maintained as well as xconfig or menuconfig);
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however, gconfig does have a few more viewing choices than
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xconfig does.
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###
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