41 lines
1.3 KiB
Nix
41 lines
1.3 KiB
Nix
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# rpi-cross-overlay.nix
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#
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# Override pkgs.rpi to cross-compile when buildPlatform != hostPlatform.
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#
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# By default, nixos-raspberrypi's nixpkgs-rpi module creates pkgs.rpi via
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# mkRpiPkgs which imports nixpkgs with system="aarch64-linux" — a NATIVE
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# aarch64 build that requires QEMU on x86_64 builders.
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#
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# This module detects cross-compilation (buildPlatform != hostPlatform) and
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# re-imports pkgs.rpi using localSystem (builder) + crossSystem (target) so
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# that kernel, firmware, and rpi-optimized packages are genuinely cross-compiled
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# with zero QEMU emulation.
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#
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# Once nixos-raspberrypi upstream supports buildPlatform natively in mkRpiPkgs,
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# this module can be removed.
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{ config, lib, pkgs, nixos-raspberrypi, ... }:
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let
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inherit (config.nixpkgs) buildPlatform hostPlatform;
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isCross = buildPlatform.system != hostPlatform.system;
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in
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lib.mkIf isCross {
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nixpkgs.overlays = [
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(final: prev: {
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rpi = import pkgs.path {
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localSystem = { system = buildPlatform.system; };
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crossSystem = { system = hostPlatform.system; };
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overlays = with nixos-raspberrypi.overlays; [
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bootloader
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vendor-kernel
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vendor-firmware
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kernel-and-firmware
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vendor-pkgs
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pkgs
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];
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};
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})
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];
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}
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