mio-ops/hardware/raspberry_pi_4_model_B.nix

# Configuration common to all Raspberry Pi 4 Model B devices
{
  config,
  pkgs,
  lib,
  ...
}: {
  boot = {
    initrd = {
      availableKernelModules = [
        "usbhid"
        "usb_storage"
      ];
    };
    kernelPackages = pkgs.linuxPackages_5_15; # For a Raspberry Pi 4
    kernelParams = [
      "cma=128M" # Many GUI programs need this, nearly all wayland applications
      "8250.nr_uarts=1"
      "console=ttyAMA0,115200" # the serial console broken out to the GPIO
      "console=tty1"
    ];
    loader = {
      grub = {
        enable = false; # NixOS wants to enable GRUB by default.
      };
    };
    tmp.useTmpfs = true;
  };

  # File systems configuration for using the installer's partition layout
  fileSystems = {
    "/" = {
      device = "/dev/disk/by-label/NIXOS_SD";
      fsType = "ext4";
    };
    "/boot/firmware" = {
      device = "/dev/disk/by-label/FIRMWARE";
      fsType = "vfat";
      # Alternatively, this could be removed from the configuration.
      # The filesystem is not needed at runtime, it could be treated
      # as an opaque blob instead of a discrete FAT32 filesystem.
      options = ["nofail" "noauto"];
    };
  };

  # !!! Adding a swap file is optional, but strongly recommended!
  swapDevices = [
    {
      device = "/swapfile";
      size = 1024;
    }
  ];

  hardware = {
    enableRedistributableFirmware = true; # Enable support for Pi firmware blobs
  };

  environment.systemPackages = with pkgs; [
    libraspberrypi # Userland tools for the Raspberry Pi board
  ];
}