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  boot = {
    loader.grub = {
      memtest86.enable = true;
      version = 2;
      enable = true;
      device = "/dev/sda";
      extraEntries = ''
        menuentry "Windows 7" {
          insmod part_gpt
          insmod chain
          set root="hd1,msdos1"
          chainloader +1
        }
      '';
    };
    initrd.availableKernelModules = [ ];
    kernelParams = [
      #"console=hvc0"
      "boot.shell_on_fail"
      #"vm.min_free_kbytes=4194304"
    ];
    extraModprobeConfig = "options snd_hda_intel enable=1,0";
  };