There is good support for cross-compilation in nixpkgs, but as far as I can tell, none in NixOS. This has a drastic impact on the usefulness of cross-compiling within Nix.

Ideally one would be able to:

• Build a cross-compiled system configuration.
• Deploy the system to a local storage medium (like nixos-install).
• Deploy the system via nixops (basic ssh deployment).
• Build a target-specific firmware image (where applicable).

I am prepared to work on this, but I would first like some guidence from people familiar with the NixOS code.