{
  inputs = {
    nixpkgs.url = "github:matthewcroughan/nixpkgs/mc/riscv-testing";

    # VisionFive ("v1")
    vendor-kernel = {
      url = "github:starfive-tech/linux";
      flake = false;
    };
    jh7100_ddrinit = {
      url = "https://github.com/starfive-tech/JH7100_ddrinit/releases/download/ddrinit-2133-211102/ddrinit-2133-211102.bin.out";
      flake = false;
    };
    jh7100_secondBoot = {
      url = "https://github.com/starfive-tech/JH7100_secondBoot/releases/download/bootloader-211102_VisionFive_JH7100/bootloader-JH7100-211102.bin.out";
      flake = false;
    };
    jh7100_recovery_binary = {
      url = "https://github.com/starfive-tech/bootloader_recovery/releases/download/JH7100_recovery_binary/jh7100_recovery_boot.bin";
      flake = false;
    };
    jh71xx-tools = {
      url = "github:xypron/jh71xx-tools";
      flake = false;
    };

    # VisionFive 2
    jh7110-kernel = {
      # url = "github:starfive-tech/linux/50a831018ed997c9fb3b603574176b221a28aa12"; # JH7110_VisionFive2_devel via VisionFive2 project submodule about two revisions back.
      url = "github:starfive-tech/linux/JH7110_VisionFive2_devel";
      flake = false;
    };
    jh7110_recovery_binary = {
      url = "https://github.com/starfive-tech/Tools/blob/bc6dc7e33e0c2466db0476b5043f0f77842f98f0/recovery/jh7110-recovery-20221205.bin?raw=true";
       flake = false;
     };
    # Should be possible to build from https://github.com/starfive-tech/VisionFive2
    jh7110_u-boot-spl-bin = {
      url = https://github.com/starfive-tech/VisionFive2/releases/download/VF2_v2.8.0/u-boot-spl.bin.normal.out;
      flake = false;
    };
    jh7110_u-boot-bin = {
      url = https://github.com/starfive-tech/VisionFive2/releases/download/VF2_v2.8.0/visionfive2_fw_payload.img;
      flake = false;
    };
  };
  outputs = inputs@{ self, nixpkgs, jh71xx-tools, jh7100_recovery_binary, jh7100_secondBoot, jh7100_ddrinit, vendor-kernel, ... }:
    let
      inherit (nixpkgs) lib;
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; overlays = [ self.overlay ]; };
      modules = [
        { nixpkgs.overlays = [ self.overlay ]; }
        "${nixpkgs}/nixos/modules/installer/sd-card/sd-image-riscv64-visionfive-installer.nix"
        ./base.nix
        ./configuration.nix
      ];

      # Pass arguments to a module inside a function inside a file, while preserving
      # the file name behavior of the module system.
      importApply =
        modulePath: staticArgs:
          lib.setDefaultModuleLocation modulePath (import modulePath staticArgs);
    in
    {
      overlay = final: prev: {
        linuxPackages_visionfive = final.linuxPackagesFor ((final.callPackage ./kernel.nix { inherit vendor-kernel; }).override { patches = []; });
      };
      legacyPackages.${system} =
        {
          inherit (pkgs.pkgsCross.riscv64.linux) linuxPackages_visionfive;
        };
      apps.${system} = {
        flashBootloader =
          let
            expectScript = pkgs.writeScript "expect-visionfive.sh" ''
              #!${pkgs.expect}/bin/expect -f
              set timeout -1
              spawn ${pkgs.picocom}/bin/picocom [lindex $argv 0] -b 115200 -s "${pkgs.lrzsz}/bin/sz -X"
              expect "Terminal ready"
              send_user "\n### Apply power to the VisionFive Board ###\n"
              expect "bootloader"
              expect "DDR"
              send "\r"
              expect "0:update uboot"
              expect "select the function:"
              send "0\r"
              expect "send file by xmodem"
              expect "CC"
              send "\x01\x13"
              expect "*** file:"
              send "${pkgs.pkgsCross.riscv64.firmware-visionfive}/opensbi_u-boot_visionfive.bin"
              send "\r"
              expect "Transfer complete"
            '';
            program = pkgs.writeShellScript "flash-visionfive.sh" ''
              if $(groups | grep --quiet --word-regexp "dialout"); then
                echo "User is in dialout group, flashing to board without sudo"
                ${expectScript} $1
              else
                echo "User is not in dialout group, flashing to board with sudo"
                sudo ${expectScript} $1
              fi
            '';
          in
          {
            type = "app";
            program = "${program}";
          };
        flashOriginal =
          let
            flashScript = pkgs.writeScript "jh7100-recover-visionfive.sh" ''
              set -x
              ${pkgs.lib.getExe self.packages.${system}.jh7100-recover} \
                -D $1 \
                -r ${jh7100_recovery_binary} \
                -b ${jh7100_secondBoot} \
                -d ${jh7100_ddrinit}
            '';
            program = pkgs.writeShellScript "flash-visionfive.sh" ''
              if $(groups | grep --quiet --word-regexp "dialout"); then
                echo "User is in dialout group, flashing to board without sudo"
                ${flashScript} $1
              else
                echo "User is not in dialout group, flashing to board with sudo"
                sudo ${flashScript} $1
              fi
            '';
          in
          {
            type = "app";
            program = "${program}";
          };
        } // import ./visionfive2/commands.nix { inherit inputs pkgs; };
      packages.${system} = {
        jh7100-recover = pkgs.writeCBin "jh7100-recover" (builtins.readFile "${jh71xx-tools}/jh7100-recover.c");
      };
      images = {
        visionfive-cross = self.nixosConfigurations.visionfive-cross.config.system.build.sdImage;
        visionfive-native = self.nixosConfigurations.visionfive-native.config.system.build.sdImage;

        visionfive2-cross = self.nixosConfigurations.visionfive2-cross.config.system.build.sdImage;
        visionfive2-native = self.nixosConfigurations.visionfive2-native.config.system.build.sdImage;
      };
      nixosModules = {
        visionfive2-sd-image = importApply ./visionfive2/sd-image.nix { inherit inputs importApply; };
        visionfive2-kernel = importApply ./visionfive2/kernel/nixos-module.nix { inherit inputs importApply; };
      };
      nixosConfigurations =
      let
        visionfive2-example-modules = [
          ./base.nix
          ./configuration.nix
          self.nixosModules.visionfive2-sd-image
        ];
      in
      {
        visionfive-cross = nixpkgs.lib.nixosSystem {
          system = "${system}";
          modules = modules ++ [
            {
              nixpkgs.crossSystem = {
                system = "riscv64-linux";
              };
            }
          ];
        };
        visionfive-native = nixpkgs.lib.nixosSystem {
          system = "riscv64-linux";
          modules = modules;
        };

        visionfive2-cross = nixpkgs.lib.nixosSystem {
          system = "${system}";
          modules = visionfive2-example-modules ++ [
            {
              nixpkgs.crossSystem = {
                system = "riscv64-linux";
              };
            }
          ];
        };
        visionfive2-native = nixpkgs.lib.nixosSystem {
          system = "riscv64-linux";
          modules = visionfive2-example-modules;
        };
      };
    };
}