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How does Kconfig make config work in Linux?
If this file is not found, it checks for a file named “all.config” to contain forced values. This enables you to create “miniature” config (miniconfig) or custom config files containing just the config symbols that you are interested in. Then the kernel config system generates the full .config file, including symbols of your miniconfig file.
What is the default value in Kconfig language?
If an input prompt is visible the default value is presented to the user and can be overridden by him. Optionally, dependencies only for this default value can be added with “if”. The default value deliberately defaults to ‘n’ in order to avoid bloating the build. With few exceptions, new config options should not change this.
How does Kconfig make config break symlinks?
If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not break symlinks when .config is a symlink to somewhere else. If you set CONFIG_ in the environment, Kconfig will prefix all symbols with its value when saving the configuration, instead of using the default, CONFIG_.
Which is the numeric key in Kconfig make?
You can also just use the corresponding numeric key to execute the commands unless you are in a data entry window. E.g., instead of F6 for Save, you can just press 6. Use F1 for Global help or F3 for the Short help menu.
The Linux kernel build-system provide many build targets, the best way to know about it is probably to do a make help:
How to de-select an option in Linux kernel?
For example, the following script is what I want to achieve: choice prompt “Camera type” default CAMERA1 config CAMERA1 select POWER_PIN_ACTIVE_HIGH config CAMERA2 deselect POWER_PIN_ACTIVE_HIGH config CAMERA3 select POWER_PIN_ACTIVE_HIGH endchoice config POWER_PIN_ACTIVE_HIGH bool “Power pin is high active?”
Which is the first step in Kconfig / kbuild?
The first step reads the Kconfig file under source root to construct an initial configuration database; then it updates the initial database by reading an existing configuration file according to this priority:
What are the two parts of Kconfig infrastructure?
Logically, Kconfig’s infrastructure has two parts: one implements a new language to define the configuration items (see the Kconfig files under the kernel source), and the other parses the Kconfig language and deals with configuration actions. Most of the config targets have roughly the same internal process (shown below):