Lots of changes to the directories organisation, more work needed.

modules/common/hardware/boot-params.nix

@@ -0,0 +1,31 @@
+{ config, deviceType, ... }:
+
+{
+  config = mkMerge [
+    ({
+      boot = {
+        plymouth.enable = true;
+        # Enable "Silent boot"
+        consoleLogLevel = 3;
+        initrd.verbose = false;
+        loader.timeout = 1;
+      };
+    })
+
+    ( mkIf (deviceType == "computer" || deviceType == "tv") {
+    # Bootloader options
+      boot = {
+        initrd.systemd.enable = true;
+        loader.systemd-boot.enable = true;
+        loader.efi.canTouchEfiVariables = true;
+        kernelParams = [
+          "quiet"
+          "udev.log_level=3"
+          "systemd.show_status=auto"
+          "pcie_aspm=force"
+          "consoleblank=60"
+        ];
+      };
+    })
+  ];
+}

modules/common/hardware/default.nix

@@ -4,6 +4,8 @@
   imports = [
     # To test
     ./disks/default.nix
+    ./boot-params.nix
     ./cpu.nix
+    ./graphics.nix
   ];
 }

modules/common/hardware/graphics.nix

@@ -0,0 +1,53 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.numbus.hardware;
+in
+
+{
+  options.numbus.hardware = {
+    nvidia = {
+      enable = mkEnableOption "Wether to install the NVIDIA driver. Required for better performance with NVIDIA graphics cards."
+    }
+  }
+
+  config = mkMerge [
+    ({
+      # Enable OpenGL
+      hardware.graphics = {
+        enable = true;
+      };
+    })
+
+    ( mkIf (cfg.nvidia.enable == true) {
+      # Load nvidia driver for Xorg and Wayland
+      services.xserver.videoDrivers = [ "nvidia" ];
+
+      hardware.nvidia = {
+        # Modesetting is required.
+        modesetting.enable = true;
+        # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
+        # Enable this if you have graphical corruption issues or application crashes after waking
+        # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead 
+        # of just the bare essentials.
+        powerManagement.enable = false;
+
+        # Fine-grained power management. Turns off GPU when not in use.
+        # Experimental and only works on modern Nvidia GPUs (Turing or newer).
+        powerManagement.finegrained = false;
+
+        # Use the NVidia open source kernel module (not to be confused with the
+        # independent third-party "nouveau" open source driver).
+        # Support is limited to the Turing and later architectures. Full list of 
+        # supported GPUs is at: 
+        # https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus 
+        # Only available from driver 515.43.04+
+        open = false;
+
+        nvidiaSettings = true;
+        # Optionally, you may need to select the appropriate driver version for your specific GPU.
+        package = config.boot.kernelPackages.nvidiaPackages.stable;
+      };
+    })
+  ];
+}

modules/common/hardware/pcie-coral.nix

@@ -0,0 +1,111 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.numbus.hardware.pcie-coral;
+
+  gasket-driver = { stdenv, lib, fetchFromGitHub, kernel }: stdenv.mkDerivation rec {
+    pname = "gasket";
+    version = "1.0-18";
+
+    src = fetchFromGitHub {
+      owner = "google";
+      repo = "gasket-driver";
+      rev = "97aeba584efd18983850c36dcf7384b0185284b3";
+      sha256 = "pJwrrI7jVKFts4+bl2xmPIAD01VKFta2SRuElerQnTo=";
+    };
+
+    makeFlags = [
+      "-C"
+      "${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+      "M=$(PWD)"
+    ];
+    buildFlags = [ "modules" ];
+
+    installFlags = [ "INSTALL_MOD_PATH=${placeholder "out"}" ];
+    installTargets = [ "modules_install" ];
+
+    sourceRoot = "source/src";
+    hardeningDisable = [ "pic" "format" ];
+    nativeBuildInputs = kernel.moduleBuildDependencies;
+
+    meta = with lib; {
+      description = "The Coral Gasket Driver allows usage of the Coral EdgeTPU on Linux systems.";
+      homepage = "https://github.com/google/gasket-driver";
+      license = licenses.gpl2;
+      maintainers = [ maintainers.kylehendricks ];
+      platforms = platforms.linux;
+    };
+  };
+
+  libedgetpu-pkg = { stdenv, lib, fetchFromGitHub, libusb1, abseil-cpp, flatbuffers, xxd }:
+    let
+      flatbuffers_1_12 = flatbuffers.overrideAttrs (oldAttrs: rec {
+        version = "1.12.0";
+        NIX_CFLAGS_COMPILE = "-Wno-error=class-memaccess -Wno-error=maybe-uninitialized";
+        cmakeFlags = (oldAttrs.cmakeFlags or []) ++ ["-DFLATBUFFERS_BUILD_SHAREDLIB=ON"];
+        NIX_CXXSTDLIB_COMPILE = "-std=c++17";
+        configureFlags = (oldAttrs.configureFlags or []) ++ ["--enable-shared"];
+        src = fetchFromGitHub {
+          owner = "google";
+          repo = "flatbuffers";
+          rev = "v${version}";
+          sha256 = "sha256-L1B5Y/c897Jg9fGwT2J3+vaXsZ+lfXnskp8Gto1p/Tg=";
+        };
+      });
+
+    in stdenv.mkDerivation rec {
+      pname = "libedgetpu";
+      version = "grouper";
+
+      src = fetchFromGitHub {
+        owner = "google-coral";
+        repo = pname;
+        rev = "release-${version}";
+        sha256 = "sha256-73hwItimf88Iqnb40lk4ul/PzmCNIfdt6Afi+xjNiBE=";
+      };
+
+      makeFlags = ["-f" "makefile_build/Makefile" "libedgetpu" ];
+
+      buildInputs = [
+        libusb1
+        abseil-cpp
+        flatbuffers_1_12
+      ];
+
+      nativeBuildInputs = [
+        xxd
+      ];
+
+      NIX_CXXSTDLIB_COMPILE = "-std=c++17";
+
+      TFROOT = "${fetchFromGitHub {
+        owner = "tensorflow";
+        repo = "tensorflow";
+        rev = "v2.7.4";
+        sha256 = "sha256-liDbUAdaVllB0b74aBeqNxkYNu/zPy7k3CevzRF5dk0=";
+      }}";
+
+      enableParallelBuilding = false;
+
+      installPhase = ''
+        mkdir -p $out/lib
+        cp out/direct/k8/libedgetpu.so.1.0 $out/lib
+        ln -s $out/lib/libedgetpu.so.1.0 $out/lib/libedgetpu.so.1
+        mkdir -p $out/lib/udev/rules.d
+        cp debian/edgetpu-accelerator.rules $out/lib/udev/rules.d/99-edgetpu-accelerator.rules
+      '';
+    };
+
+  gasket = config.boot.kernelPackages.callPackage gasket-driver {};
+  libedgetpu = pkgs.callPackage libedgetpu-pkg {};
+in
+
+{
+  options.numbus.hardware.pcie-coral = lib.mkEnableOption "PCIe Coral TPU support";
+
+  config = lib.mkIf cfg.enable {
+    services.udev.packages = [ "libedgetpu" ];
+    users.groups.plugdev = {};
+    boot.extraModulePackages = [ "gasket" ];
+  };
+}