If you have a linux kernel configuration defconfig, this guide may help.
Don’t suffer from Windows errors anymore.
deconfig. Creates a new kernel configuration with your default response used for all options. The default values are looked up from a file like arch/$ARCH/defconfig, where $ARCH refers to the specific architecture you see the kernel is built for.
.config file is not just a copy of your
defconfig. Then comes the enthusiasm for storing
defconfig in this absolute format: in
defconfig we could also specify options in addition to non-default values (i.e. options which we use the most modified for the board). This way we can keep it small and uncluttered. Each new kernel release brings a bunch of new options, and in that direction, we don’t need to update a specific
defconfig file with each release of that kernel. It’s also worth noting that the kernel build system maintains the most specific order of parameters carrying the
defconfig file, so it’s best not to edit them manually anymore. Instead, everyone should use the rule
.config file is generated, the kernel build system that appears looks at every bit of the
Kconfig files (in all subdirectories) and checks all the options in those
Kconfig files >:
defconfig, the physical assembly places this setting in
. With configsave selected to
defconfig, the build system provides the setting in
.configusing the default value specified in
Kconfig. > indicated. code>
Check scripts/kconfig/Makefile and scripts/kconfig/conf.Files to see how it actually works.
A More Precise And Therefore More Detailed Explanation
Where is the Defconfig file in Linux?
The defconfig platform contains all the custom Linux kconfig settings needed to customize the kernel build (features, escape system settings, etc.) for this console. Defconfig files are usually stored along with the kernel tree in arch/*/configs/.
Define configuration symbols:
Configuration are symbols defined in files that are considered
Kconfig files. Each
Kconfig data file can describe any number of characters, and can also contain other
Kconfig (source) files. Compiling aims to create a configuration menu of kernel heap options like
make menuconfig and understanding those files to create a specific tree structure. Each directory in our kernel has a
Kconfig which I would say contains the
Kconfig files of its subdirectories. Above the kernel code resource directory is the
Kconfig file, which is the root of this options tree.
scripts/kconfig/gconf) and other build targets Programs that run this type
Kconfig in the root directory and recursively read these
Kconfig files found in each subdirectory of the market, to build your menus. The subdirectory visit time is also defined in each of these
Kconfig files and also depends on the configuration symbol values chosen by the user process.
Save symbol values: file
How do I configure my yocto kernel?
How to change the Linux kernel configuration file in the meta layer of the Yocto project.Requirements preparation.Download the metalayer.Git clones this Linux kernel source code.Customize how to customize.Copy the configuration at the meta level.Install the full patch in the Linux kernel recipe.
All configuration symbol values are stored in a special file called
.config. Every time you want to change an important kernel build configuration, run a great make target like
xconfig. Read these
Kconfig workbooks to create a menu and store configuration icon values with their current values, which are manually set in
.config. In addition, these update tools can also create this
.config file with the new options you choose, if it didn’t already exist.
.config file is plain text, your organization can also edit itwithout using any special tools. It’s also extremely handy for backing up and restoring previous kernel build configurations.
$ Install ARCH=Activate your_board_defconfig
$ make ARCH=arm help support | deconfigure
If grep needs to do the opposite (i.e. generate a proper little
defconfig from a
.config set), you can use the
saveefconfig rule :
$reach ARCH=arm saveefconfig
Also, as 0andriy mentioned, clients can use the
diffconfig script to detect changes to any of the
. To customize another:
$scripts/diffconfig .config_old .config_new
With these goals, each core can be configured differently.
usually look at allyesconfig,allmodconfig,allnoconfig andrandconfig targets also useEnvironment variable KCONFIG_ALLCONFIG. If thisThe variable points to a file, this image is used as oneConfiguration list values you need time to set a specific valueEvaluate. In other words, overrides archive the actual normal behaviordo Goals.
and you enterdo everything without configuration and the right thingEnvironment Variable KCONFIG_ALLCONFIGKCONFIG_ALLCONFIG= Effect:
$..Make /must_be_set allnoconfig$grep CONFIG_SWAP .configCONFIG_SWAP=y
If modification KCONFIG_ALLCONFIG is not defined, buildThe system looks for files in the top-level make directory named:
If any of these native files are present, the build will use the individuals as configuration value lists, most of which should befueled these ideas. If none of these files were found, buildFinally, the system looks for the link using a file named all.config.list of applied configuration values.
You must transfer these different files through a well known database.A configuration that could probably still work. Then the configuration of the new optionscan be used to create exceptional test sets Forging for needsPosition.