{ lib, pkgs, pkgsKernel, ... }:
let
  brainKernel = import ../nix/brain-kernel.nix { pkgs = pkgsKernel; };
in {
  # =========================================================================
  #      Board specific configuration
  # =========================================================================

  boot.kernelPackages = pkgsKernel.linuxPackagesFor brainKernel;

  boot.kernelParams = [
    "console=ttyAMA0,115200n8"
    "console=tty1"
    "rootwait"
    "fbcon=font:ProFont6x11"
  ];

  boot.supportedFilesystems = lib.mkForce [
    "vfat"
    "ext4"
    "btrfs"
  ];

  hardware.deviceTree = {
    enable = true;
    name = "imx28-pwsh6.dtb";
  };

  # Firmware bundle; keep the same set as before.
  hardware.firmware = lib.mkForce (
    with pkgs; [
      linux-firmware
      intel2200BGFirmware
      rtl8192su-firmware
      rt5677-firmware
      zd1211fw
      # alsa-firmware builds a host tool (tobin) that runs during build.
      pkgs.buildPackages.alsa-firmware
    ]
    ++ lib.optional (pkgs.stdenv.hostPlatform.isAarch32 || pkgs.stdenv.hostPlatform.isAarch64)
      raspberrypiWirelessFirmware
    ++ lib.optionals (builtins.hasAttr "rtl8723bs-firmware" pkgs && lib.versionOlder brainKernel.version "4.13") [
      pkgs."rtl8723bs-firmware"
    ]
    ++ lib.optionals (builtins.hasAttr "openelec-dvb-firmware" pkgs) [
      pkgs."openelec-dvb-firmware"
    ]
    ++ lib.optionals (builtins.hasAttr "rtlwifi_new-firmware" pkgs) [
      pkgs."rtlwifi_new-firmware"
    ]
  );

  powerManagement.cpuFreqGovernor = "ondemand";

  # =========================================================================
  #      Base NixOS Configuration
  # =========================================================================

  networking.hostName = "brain";
  networking.useDHCP = true;

  services.openssh = {
    enable = lib.mkDefault true;
    settings = {
      X11Forwarding = lib.mkDefault true;
      PasswordAuthentication = lib.mkDefault true;
    };
    openFirewall = lib.mkDefault true;
  };

  nix.settings = {
    experimental-features = [ "nix-command" "flakes" ];
  };

  system.stateVersion = "25.11";
}