Linux kernel: Difference between revisions

Line 135:

by opening {{ic|/tmp/nix-build-linux-config-4.19.0-mptcp_v0.94.1.drv-0/.attr-0}}.

== Cross-compile xconfig and menuconfig ==

== Embedded Linux Cross-compile xconfig and menuconfig ==

~~Use this~~ shell.nix(example below is for aarch64):

This section details the on how to get an environment that can be used to configure and cross-compile the kernel for embedded Linux development. The kernel source won't come from nix unpack phase but rather gotten externally(such as from the chip vendor github). So first clone the kernel source, then use the shell.nix below will to set up the dev environment(example below is for aarch64):

let

~~hostPkgs~~ = import <nixpkgs> { };

pkgs = import <nixpkgs> { };

~~pkgs~~ = import <nixpkgs> {

aarch64Pkgs = import <nixpkgs> {

crossSystem = ~~(import <nixpkgs/lib>).systems.examples.~~aarch64-~~multiplatform~~;

crossSystem = {

config = "aarch64-unknown-linux-gnu";

};

in

pkgs.~~mkShell rec~~ {

(pkgs.buildFHSUserEnv {

~~depsBuildBuild~~ = ~~[ hostPkgs.buildPackages.stdenv.cc ]~~;

name = "kernel-build-env";

~~nativeBuildInputs~~ = with ~~hostPkgs.buildPackages~~; [

targetPkgs = pkgs: (with pkgs;

~~bison~~

[

~~flex~~

pkgconfig

~~lzop~~

ncurses

pkgconfig

qt5.qtbase

ncurses

pkgsCross.aarch64-multiplatform.stdenv.cc

qt5.qtbase

]

~~openssl~~

++ pkgs.linux.nativeBuildInputs);

];

runScript = pkgs.writeScript "init.sh" ''

~~shellHook~~ = ''

export ARCH=arm64

export CC=aarch64-unknown-linux-gnu-

export CROSS_COMPILE=aarch64-unknown-linux-gnu-

export PKG_CONFIG_PATH="${~~hostPkgs~~.ncurses.dev}/lib/pkgconfig:${~~hostPkgs~~.qt5.qtbase.dev}/lib/pkgconfig"

export PKG_CONFIG_PATH="${pkgs.ncurses.dev}/lib/pkgconfig:${pkgs.qt5.qtbase.dev}/lib/pkgconfig"

export QT_QPA_PLATFORM_PLUGIN_PATH="${~~hostPkgs~~.qt5.qtbase.bin}/lib/qt-${~~hostPkgs~~.qt5.qtbase.version}/plugins"

export QT_QPA_PLATFORM_PLUGIN_PATH="${pkgs.qt5.qtbase.bin}/lib/qt-${pkgs.qt5.qtbase.version}/plugins"

export QT_QPA_PLATFORMTHEME=qt5ct

exec bash

'';

}

}).env

</syntaxHighlight>

Finally, cd to the kernel source dir and do development normally.

== make menuconfig ==