{ config, inputs, lib, pkgs, ... }: {
  imports = [
    inputs.nixos-hardware.nixosModules.raspberry-pi-4
  ];
  kyouma.machine-type.physical = true;

  boot = {
    extraModprobeConfig = ''
      options snd_bcm2835 enable_headphones=1
    '';
    kernelParams = [ "snd_bcm2835.enable_hdmi=1" ];
    loader.raspberryPi.firmwareConfig = ''
      dtparam=audio=on
      dtparam=krnbt=on
    '';
  };
  console.enable = false;

  environment.systemPackages = with pkgs; [
    bluez
    bluez-tools
    libcec
    libraspberrypi
    raspberrypi-eeprom
  ];
  fileSystems = {
    "/" = {
      device = "/dev/disk/by-label/NIXOS_SD";
      fsType = "ext4";
      options = [ "noatime" ];
    };
  }; 
  hardware = {
    bluetooth.enable = true;
    pulseaudio.enable = true;
    deviceTree = {
      enable = true;
      overlays = [
        {
          name = "bluetooth-overlay";
          dtsText = ''
            /dts-v1/;
            /plugin/;
            / {
                compatible = "brcm,bcm2711";
                fragment@0 {
                    target = <&uart0_pins>;
                    __overlay__ {
                            brcm,pins = <30 31 32 33>;
                            brcm,pull = <2 0 0 2>;
                    };
                };
            };
          '';
        }
      ];
    };
    raspberry-pi."4" = {
      apply-overlays-dtmerge.enable = true;
      fkms-3d.enable = true;
    };
  };

  nixpkgs.overlays = [
    (self: super: { libcec = super.libcec.override { withLibraspberrypi = true; }; })
  ];

  sound.enable = true;
  services.avahi = {
    enable = true;
    ipv6 = true;
    nssmdns4 = true;
    publish.enable = true;
    publish.userServices = true;
  };
  services.fstrim.enable = true;
}