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f08ea207ef
This commit updates the the link from the former, unofficial nixos wiki page to the new https://wiki.nixos.org ref: NixOS/foundation#113
121 lines
3.5 KiB
Markdown
121 lines
3.5 KiB
Markdown
# Kernel Development
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> WIP work in progress
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An example of kernel development with `flake.nix`.
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```nix
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{
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description = "NixOS running on LicheePi 4A";
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inputs = {
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nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11-small";
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# custom kernel's source
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thead-kernel = {
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url = "github:revyos/thead-kernel/lpi4a";
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flake = false;
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};
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};
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outputs = inputs@{
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self
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,nixpkgs
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,thead-kernel
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,... }:
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let
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pkgsKernel = import nixpkgs {
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localSystem = "x86_64-linux";
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crossSystem = {
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config = "riscv64-unknown-linux-gnu";
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};
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overlays = [
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(self: super: {
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# use gcc 13 to compile this custom kernel
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linuxPackages_thead = super.linuxPackagesFor (super.callPackage ./pkgs/kernel {
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src = thead-kernel;
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stdenv = super.gcc13Stdenv;
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kernelPatches = with super.kernelPatches; [
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bridge_stp_helper
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request_key_helper
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];
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});
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})
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];
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};
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in
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{
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nixosConfigurations.lp4a = nixpkgs.lib.nixosSystem {
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system = "x86_64-linux";
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specialArgs = {
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inherit nixpkgs pkgsKernel;
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};
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modules = [
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{
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# cross-compile this flake.
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nixpkgs.crossSystem = {
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system = "riscv64-linux";
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};
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}
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./modules/licheepi4a.nix
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./modules/sd-image-lp4a.nix
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];
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};
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# use `nix develop .#kernel` to enter the environment with the custom kernel build environment available.
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# and then use `unpackPhase` to unpack the kernel source code and cd into it.
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# then you can use `make menuconfig` to configure the kernel.
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#
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# problem
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# - using `make menuconfig` - Unable to find the ncurses package.
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devShells.x86_64-linux.kernel = pkgsKernel.linuxPackages_thead.kernel.dev;
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# use `nix develop .#fhs` to enter the fhs test environment defined here.
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devShells.x86_64-linux.fhs = let
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pkgs = import nixpkgs {
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system = "x86_64-linux";
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};
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in
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# the code here is mainly copied from:
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# https://wiki.nixos.org/wiki/Linux_kernel#Embedded_Linux_Cross-compile_xconfig_and_menuconfig
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(pkgs.buildFHSUserEnv {
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name = "kernel-build-env";
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targetPkgs = pkgs_: (with pkgs_;
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[
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# we need theses packages to run `make menuconfig` successfully.
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pkgconfig
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ncurses
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pkgsKernel.gcc13Stdenv.cc
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gcc
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]
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++ pkgs.linux.nativeBuildInputs);
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runScript = pkgs.writeScript "init.sh" ''
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# set the cross-compilation environment variables.
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export CROSS_COMPILE=riscv64-unknown-linux-gnu-
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export ARCH=riscv
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export PKG_CONFIG_PATH="${pkgs.ncurses.dev}/lib/pkgconfig:"
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exec bash
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'';
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}).env;
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};
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}
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```
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With the above `flake.nix`, I can enter the kernel build environment with
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`nix develop .#kernel`, and then use `unpackPhase` to unpack the kernel source code and cd
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into it. But I can't use `make menuconfig` to configure the kernel, because the `ncurses`
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package is missing in this environment.
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To solve this problem, I add a `fhs` environment to install the `ncurses` package and
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other necessary packages, and then I can use `nix develop .#fhs` to enter this environment
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and use `make menuconfig` to configure the kernel.
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## References
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- [Linux kernel - NixOS Wiki](https://wiki.nixos.org/wiki/Linux_kernel)
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- https://github.com/jordanisaacs/kernel-module-flake
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