{
  description = "my project description";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = inputs@{self, nixpkgs, flake-utils, ...}:
  flake-utils.lib.eachDefaultSystem (system:
  let
    pkgs = import nixpkgs {
      inherit system;
    };
    crossPkgs = pkgs.pkgsCross.aarch64-multiplatform;
  in
  {
    apps.default = {
      type = "app";
      program = "${self.outputs.packages.${system}.vmscript}/bin/vmscript";
    };
    packages = {
      default = import ./sd-card.nix { inherit pkgs crossPkgs; };
      uncompressed = import ./sd-card.nix { inherit pkgs crossPkgs; compress = false; };

      vmscript = pkgs.writeScriptBin "vmscript" ''
        #!${pkgs.runtimeShell} -e
        img=./sd-card.img
        cp -b ${self.outputs.packages.${system}.uncompressed}/sd-card.img $img
        chmod 640 $img
        ${pkgs.qemu}/bin/qemu-system-aarch64 \
          -machine raspi3b \
          -kernel "${crossPkgs.ubootRaspberryPi3_64bit}/u-boot.bin" \
          -cpu max \
          -m 1G \
          -smp 4 \
          -drive file="$img",format=raw \
          -nographic \
          -serial null \
          -serial mon:stdio
      '';

    };

  });
}