Maybe this guy here you are missing:
Or you can even delegate all those shenanigans to nixos/nix-hardware by doing:
{
description = "NixOS configuration with flakes";
inputs.nixos-hardware.url = "github:NixOS/nixos-hardware/master";
outputs = { self, nixpkgs, nixos-hardware }: {
# replace <your-hostname> with your actual hostname
nixosConfigurations.<your-hostname> = nixpkgs.lib.nixosSystem {
# ...
modules = [
# ...
# add your model from this list: https://github.com/NixOS/nixos-hardware/blob/master/flake.nix
nixos-hardware.nixosModules.framework.amd-7040
];
};
};
}
Like I do in here: https://github.com/storopoli/flakes/blob/main/flake.nix#L67-L68