Init at 5.15.43-rt45

README.md

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+# Raspberry Pi 4 PREEMPT_RT Kernel for NixOS
+This flake provides packages to build the [Raspberry Pi supplied kernel](https://github.com/raspberrypi/linux) with `PREEMPT_RT` enabled.
+
+### Usage
+Add the overlay and set `boot.kernelPackages` to `pkgs.linuxPackages_rpi4_rt`
+
+An example flake based system config with `boot.loader.raspberryPi` and `nixos-hardware`:
+
+``` nix
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    nixos-hardware.url = "github:mattywillo/linux_rpi4_rt-nix";
+    rpi4_rt.url = "github:this/url";
+  };
+  outputs = { self, nixpkgs, nixos-hardware, rpi4_rt }: {
+    nixosConfigurations.rpi = nixpkgs.lib.nixosSystem {
+      modules = [ 
+        ({pkgs, lib, ...}: { 
+          nixpkgs.overlays = [ rpi4_rt.overlay ]; 
+          
+          imports = [
+            ./hardware-configuration.nix
+            nixos-hardware.nixosModules.raspberry-pi-4
+          ];
+
+          boot.kernelPackages = pkgs.linux_rpi4_rt.linuxPackages;
+
+          boot.loader.grub.enable = false;
+          boot.loader.grub.device = "nodev";
+
+          # Recent NixOS versions enforce uniqueness on installBootLoader
+          # making nixos-hardware.raspberry-pi-4' and 'boot.loader.raspberryPi'
+          # conflict, this line prevents nixos-hardware setting the bootloader
+          boot.loader.generic-extlinux-compatible.enable = lib.mkForce false;
+
+          boot.loader.raspberryPi.enable = true;
+          boot.loader.raspberryPi.version = 4;
+          
+          #...regular system configuration...
+        }) 
+      ];
+    };
+  };
+}
+```