{
  config,
  lib,
  pkgs,
  modulesPath,
  ...
}:
{
  imports = [
    (modulesPath + "/installer/sd-card/sd-image-aarch64.nix")
  ];

  # Raspberry Pi 4 platform
  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";

  # Boot configuration - provided by sd-image-aarch64.nix
  # (grub disabled, generic-extlinux-compatible enabled, U-Boot setup)

  # Override root filesystem to use tmpfs (from impermanence-tmpfs.nix)
  # The sd-image module sets root to /dev/disk/by-label/NIXOS_SD (ext4)
  # but impermanence-tmpfs.nix overrides it to tmpfs

  # /boot/firmware is automatically configured by sd-image module
  # Device: /dev/disk/by-label/FIRMWARE (vfat)

  # Mount /nix from the NIXOS_SD partition
  # /nix/persist will be a directory on this partition (not a separate mount)
  fileSystems."/nix" = {
    device = "/dev/disk/by-label/NIXOS_SD";
    fsType = "ext4";
    options = [ "noatime" ];
    neededForBoot = true;
  };

  # No swap on SD card (wear concern)
  swapDevices = [ ];

  # SD image build configuration
  sdImage = {
    compressImage = true;

    # Populate root with directories
    populateRootCommands = ''
      mkdir -p ./files/boot
      ${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d ./files/boot

      # Create /nix/persist directory structure for impermanence
      mkdir -p ./files/nix/persist/var/lib/nixos
      mkdir -p ./files/nix/persist/home/ppetru
      mkdir -p ./files/nix/persist/etc
    '';
  };
}