What is select in KConfig?

What is select in KConfig?

select should be used with care. select will force a symbol to a value without visiting the dependencies. By abusing select you are able to select a symbol FOO even if FOO depends on BAR that is not set. In general use select only for non-visible symbols (no prompts anywhere) and for symbols with no dependencies.

What is the functionality of KConfig during the kernel compilation?

KConfig is a selection-based configuration system originally developed for the Linux kernel. It is commonly used to select build-time options and to enable or disable features, and has now found use in other projects beyond the Linux kernel.

How will get the driver added into the kernel what are KConfig files?

3 Answers

1. Create a directory like my_drvr inside drivers(which is in the Linux source code) for your driver and put your driver (my_driver.c) file inside this directory.
2. Create one Makefile inside your driver directory (using vi any editor) and inside this put obj-$(CONFIG_MY_DRIVER) += my_driver.o and save this file.

What is the use of KConfig file in Linux?

What is Kbuild in kernel?

“kbuild” is the build system used by the Linux kernel. Modules must use kbuild to stay compatible with changes in the build infrastructure and to pick up the right flags to “gcc.” Functionality for building modules both in-tree and out-of-tree is provided. Also, the kernel must have been built with modules enabled.

What build system does Linux use?

A Misconception about Linux An OS is much more than that, it includes software libraries, runtimes, and usually a default set of executables. Most Linux distributions use GNU as the operating system (including TOS). GNU is the child of Richard Stallman and was designed to be Free (As in Freedom) and Open Source.

When to use ” select ” vs ” depends ” in Java?

select is a “subset” of depends, for when there is only one possible dependency for a feature. Since there is only one possible dependency, select just selects that option automatically, and saves you the work of explicitly picking the dependency manually first.

What’s the difference between ” select ” vs ” depends ” in Kconfig?

Since there are two possible implementations for BFP_JIT, Kconfig could not sensibly select the right one automatically. Sometimes I wish I could say: “if none of the dependencies is met, select this one by default” though, that would allow to further automate stuff.

How to write Kconfig language in Linux kernel?

A single configuration option is defined like this: config MODVERSIONS bool “Set version information on all module symbols” depends on MODULES help Usually, modules have to be recompiled whenever you switch to a new kernel. Every line starts with a key word and can be followed by multiple arguments. “config” starts a new config entry.

What does ” make oldconfig ” do exactly in the Linux kernel?

Configs which are selected by turned on configs are automatically set without asking the user. and run make oldconfig, the line gets recreated without asking us, unlike DEBUG_INFO. and select forces that option to be true. See also: https://unix.stackexchange.com/questions/117521/select-vs-depends-in-kernel-kconfig