me like nix
add pi config for libcamera
author
Sean Aye
date
(Mar 22, 2026, 8:03 PM -0400)
commit
41ca9e0d
41ca9e0d92730b8f574709401a3169969f5ad640
parent
7dfe3acc
7dfe3acc92437c00a822089712f047fe61fc62e7
change-id
qwztuyrz
qwztuyrzrspkkorymntlquxornuwymxo
+378
-10
+10
flake.nix
+10
flake.nix
···
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"${nixpkgs}/nixos/modules/installer/sd-card/sd-image-aarch64.nix"
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nixos-hardware.nixosModules.raspberry-pi-4
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./hosts/pi/configuration.nix
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+
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# Allow missing kernel modules (Pi kernel doesn't have all x86 modules)
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# See: https://github.com/NixOS/nixpkgs/issues/154163
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({
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nixpkgs.overlays = [
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(final: super: {
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makeModulesClosure = x: super.makeModulesClosure (x // { allowMissing = true; });
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})
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];
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})
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];
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specialArgs = { inherit inputs; };
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};
+248
-10
hosts/pi/configuration.nix
+248
-10
hosts/pi/configuration.nix
···
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-
{ pkgs, lib, ... }:
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{ pkgs, lib, config, ... }:
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let
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# Workaround from https://github.com/NixOS/nixos-hardware/blob/master/raspberry-pi/4/apply-overlays-dtmerge.nix
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deviceTree_overlay = _final: prev: {
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deviceTree = {
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applyOverlays = prev.callPackage ./overlays/apply-overlays-dtmerge.nix { };
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compileDTS = prev.deviceTree.compileDTS;
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};
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};
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# Custom libcamera with Raspberry Pi IPA/pipeline support
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libcamera-rpi = pkgs.libcamera.overrideAttrs (old: {
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mesonFlags = (old.mesonFlags or [ ]) ++ [
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"-Dipas=rpi/vc4,rpi/pisp"
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"-Dpipelines=rpi/vc4,rpi/pisp"
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];
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});
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+
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# rpicam-apps using custom libcamera
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rpicam-apps = pkgs.stdenv.mkDerivation rec {
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pname = "rpicam-apps";
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version = "1.11.1";
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+
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src = pkgs.fetchFromGitHub {
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owner = "raspberrypi";
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repo = "rpicam-apps";
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rev = "v${version}";
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hash = "sha256-hVoKbvWFeramPkHuibJwUgFOPS9v588+K8828a1fNnA=";
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};
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+
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nativeBuildInputs = with pkgs; [
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meson
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ninja
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pkg-config
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];
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buildInputs = [
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libcamera-rpi
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pkgs.libdrm
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pkgs.libexif
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pkgs.libjpeg
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pkgs.libpng
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pkgs.libtiff
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pkgs.boost
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pkgs.ffmpeg
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];
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+
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mesonFlags = [
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"-Denable_libav=enabled"
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"-Denable_drm=enabled"
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"-Denable_egl=disabled"
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"-Denable_qt=disabled"
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"-Denable_opencv=disabled"
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"-Denable_tflite=disabled"
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"-Denable_hailo=disabled"
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];
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meta = with lib; {
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description = "Raspberry Pi camera applications";
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homepage = "https://github.com/raspberrypi/rpicam-apps";
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license = licenses.bsd2;
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platforms = [ "aarch64-linux" ];
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};
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};
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in
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{
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networking.hostName = "pi";
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+
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# Add device tree overlay for dtmerge support
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nixpkgs.overlays = [ deviceTree_overlay ];
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# Disable ZFS which isn't supported on Pi
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boot.supportedFilesystems = lib.mkForce [ "vfat" "ext4" ];
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# Pi kernel lacks device-mapper, so use legacy initrd (not systemd)
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boot.initrd.systemd.enable = false;
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# Enable SSH for headless setup
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services.openssh = {
···
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# Allow sudo without password for wheel group
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security.sudo.wheelNeedsPassword = false;
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# Camera support
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hardware.raspberry-pi."4" = {
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fkms-3d.enable = true;
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};
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-
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# go2rtc for camera streaming to Home Assistant
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services.go2rtc = {
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enable = true;
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settings = {
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ffmpeg.bin = "${pkgs.ffmpeg}/bin/ffmpeg";
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streams = {
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picam = "exec:rpicam-vid -t 0 --inline --width 1920 --height 1080 --framerate 30 -o -";
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# Use rpicam-vid for h264 streaming
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picam = "exec:${rpicam-apps}/bin/rpicam-vid -t 0 --width 1920 --height 1080 --framerate 30 --codec h264 --inline -o -";
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};
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};
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};
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# udev rule to give video group access to DMA heap devices (required for libcamera)
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services.udev.extraRules = ''
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SUBSYSTEM=="dma_heap", GROUP="video", MODE="0660"
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'';
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# Override go2rtc systemd service to run as root for camera access
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systemd.services.go2rtc.serviceConfig = {
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User = lib.mkForce "root";
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};
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# Camera and system tools
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environment.systemPackages = [
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pkgs.ffmpeg
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pkgs.libraspberrypi # for vcgencmd
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libcamera-rpi # custom libcamera with Pi support
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rpicam-apps # rpicam-vid, rpicam-still, etc.
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pkgs.v4l-utils # for v4l2-ctl debugging
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];
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# Device tree configuration for Pi Camera v3 (IMX708)
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# Based on https://github.com/raspberrypi/linux/blob/rpi-6.6.y/arch/arm/boot/dts/overlays/imx708-overlay.dts
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# and https://github.com/wagdav/homelab/blob/master/modules/camera-rpi-v1/default.nix
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hardware.deviceTree.filter = "bcm2711-rpi-4*.dtb";
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hardware.deviceTree.overlays = [
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{
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name = "imx708-overlay";
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dtsText = ''
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// SPDX-License-Identifier: GPL-2.0-only
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// Definitions for IMX708 camera module on VC I2C bus
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/dts-v1/;
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/plugin/;
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/{
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compatible = "brcm,bcm2711";
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fragment@0 {
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target = <&i2c0if>;
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__overlay__ {
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status = "okay";
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};
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};
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clk_frag: fragment@1 {
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target = <&cam1_clk>;
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__overlay__ {
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status = "okay";
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clock-frequency = <24000000>;
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};
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};
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fragment@2 {
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target = <&i2c0mux>;
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__overlay__ {
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status = "okay";
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};
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};
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reg_frag: fragment@3 {
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target = <&cam1_reg>;
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cam_reg: __overlay__ {
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startup-delay-us = <70000>;
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off-on-delay-us = <30000>;
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regulator-min-microvolt = <2700000>;
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regulator-max-microvolt = <2700000>;
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};
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};
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i2c_frag: fragment@100 {
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target = <&i2c_csi_dsi>;
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__overlay__ {
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#address-cells = <1>;
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#size-cells = <0>;
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status = "okay";
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// IMX708 sensor configuration (from imx708.dtsi)
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cam_node: imx708@1a {
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compatible = "sony,imx708";
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reg = <0x1a>;
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status = "okay";
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clocks = <&cam1_clk>;
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clock-names = "inclk";
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vana1-supply = <&cam1_reg>;
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vana2-supply = <&cam_dummy_reg>;
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vdig-supply = <&cam_dummy_reg>;
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vddl-supply = <&cam_dummy_reg>;
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rotation = <180>;
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orientation = <2>;
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port {
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cam_endpoint: endpoint {
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clock-lanes = <0>;
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data-lanes = <1 2>;
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clock-noncontinuous;
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link-frequencies =
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/bits/ 64 <450000000>;
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};
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};
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};
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// VCM (autofocus motor) configuration
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vcm_node: dw9817@c {
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compatible = "dongwoon,dw9817-vcm";
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reg = <0x0c>;
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status = "okay";
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VDD-supply = <&cam1_reg>;
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};
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};
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};
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csi_frag: fragment@101 {
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target = <&csi1>;
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csi: __overlay__ {
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status = "okay";
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brcm,media-controller;
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port {
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csi_ep: endpoint {
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remote-endpoint = <&cam_endpoint>;
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clock-lanes = <0>;
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data-lanes = <1 2>;
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clock-noncontinuous;
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};
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};
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};
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};
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__overrides__ {
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rotation = <&cam_node>,"rotation:0";
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orientation = <&cam_node>,"orientation:0";
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media-controller = <&csi>,"brcm,media-controller?";
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cam0 = <&i2c_frag>, "target:0=",<&i2c_csi_dsi0>,
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<&csi_frag>, "target:0=",<&csi0>,
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<&clk_frag>, "target:0=",<&cam0_clk>,
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<®_frag>, "target:0=",<&cam0_reg>,
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<&cam_node>, "clocks:0=",<&cam0_clk>,
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<&cam_node>, "vana1-supply:0=",<&cam0_reg>,
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<&vcm_node>, "VDD-supply:0=",<&cam0_reg>;
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vcm = <&vcm_node>, "status",
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<0>, "=4";
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link-frequency = <&cam_endpoint>,"link-frequencies#0";
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};
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};
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&cam_endpoint {
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remote-endpoint = <&csi_ep>;
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};
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'';
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}
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];
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# Raspberry Pi firmware for camera
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hardware.enableRedistributableFirmware = true;
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# Add camera config and overlays to firmware partition
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sdImage.populateFirmwareCommands = lib.mkAfter ''
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chmod u+w ./firmware/config.txt
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cat >> ./firmware/config.txt << EOF
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# Camera support - Pi Camera v3 (IMX708)
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gpu_mem=256
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EOF
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# Copy device tree overlays for camera auto-detect
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if [ -d ${pkgs.raspberrypifw}/share/raspberrypi/boot/overlays ]; then
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cp -r ${pkgs.raspberrypifw}/share/raspberrypi/boot/overlays ./firmware/
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fi
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'';
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# Networking
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networking.networkmanager.enable = true;
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# Firewall
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networking.firewall.allowedTCPPorts = [
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22 # SSH
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1984 # go2rtc API
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8554 # RTSP
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22 # SSH
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1984 # go2rtc API
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8554 # RTSP
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];
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system.stateVersion = "24.11";
+50
hosts/pi/overlays/apply-overlays-dtmerge.nix
+50
hosts/pi/overlays/apply-overlays-dtmerge.nix
···
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# modification of nixpkgs deviceTree.applyOverlays to resolve https://github.com/NixOS/nixpkgs/issues/125354
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# derived from https://github.com/NixOS/nixpkgs/blob/916ca8f2b0c208def051f8ea9760c534a40309db/pkgs/os-specific/linux/device-tree/default.nix
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{ lib, stdenvNoCC, dtc, libraspberrypi }:
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with lib; (base: overlays': stdenvNoCC.mkDerivation {
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name = "device-tree-overlays";
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nativeBuildInputs = [ dtc libraspberrypi ];
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buildCommand =
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let
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overlays = toList overlays';
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in
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''
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mkdir -p $out
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cd "${base}"
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find . -type f -name '*.dtb' -print0 \
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| xargs -0 cp -v --no-preserve=mode --target-directory "$out" --parents
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for dtb in $(find "$out" -type f -name '*.dtb'); do
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dtbCompat=$(fdtget -t s "$dtb" / compatible 2>/dev/null || true)
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# skip files without `compatible` string
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test -z "$dtbCompat" && continue
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${flip (concatMapStringsSep "\n") overlays (o: ''
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overlayCompat="$(fdtget -t s "${o.dtboFile}" / compatible)"
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# skip incompatible and non-matching overlays
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if [[ ! "$dtbCompat" =~ "$overlayCompat" ]]; then
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echo "Skipping overlay ${o.name}: incompatible with $(basename "$dtb")"
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elif ${if ((o.filter or null) == null) then "false" else ''
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[[ "''${dtb//${o.filter}/}" == "$dtb" ]]
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''}
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then
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echo "Skipping overlay ${o.name}: filter does not match $(basename "$dtb")"
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else
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echo -n "Applying overlay ${o.name} to $(basename "$dtb")... "
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mv "$dtb"{,.in}
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# dtmerge requires a .dtbo ext for dtbo files, otherwise it adds it to the given file implicitly
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dtboWithExt="$TMPDIR/$(basename "${o.dtboFile}").dtbo"
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cp -r ${o.dtboFile} "$dtboWithExt"
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dtmerge "$dtb.in" "$dtb" "$dtboWithExt"
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echo "ok"
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rm "$dtb.in" "$dtboWithExt"
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fi
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'')}
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done'';
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})
+9
packages/libcamera-rpi.nix
+9
packages/libcamera-rpi.nix
+61
packages/rpicam-apps.nix
+61
packages/rpicam-apps.nix
···
1
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{
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lib,
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stdenv,
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fetchFromGitHub,
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meson,
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ninja,
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pkg-config,
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libcamera-rpi, # Custom libcamera with Pi support
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libdrm,
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libexif,
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libjpeg,
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libpng,
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libtiff,
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boost,
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ffmpeg,
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}:
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stdenv.mkDerivation rec {
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pname = "rpicam-apps";
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version = "1.5.3";
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+
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src = fetchFromGitHub {
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owner = "raspberrypi";
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repo = "rpicam-apps";
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rev = "v${version}";
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hash = "sha256-0000000000000000000000000000000000000000000="; # Placeholder - will be updated on first build
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};
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+
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nativeBuildInputs = [
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meson
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ninja
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pkg-config
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];
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+
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buildInputs = [
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libcamera-rpi
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libdrm
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libexif
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libjpeg
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+
libpng
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libtiff
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+
boost
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ffmpeg
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];
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+
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mesonFlags = [
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"-Denable_libav=enabled"
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"-Denable_drm=enabled"
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"-Denable_egl=disabled"
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"-Denable_qt=disabled"
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"-Denable_opencv=disabled"
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"-Denable_tflite=disabled"
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];
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+
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meta = with lib; {
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description = "Raspberry Pi camera applications";
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homepage = "https://github.com/raspberrypi/rpicam-apps";
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license = licenses.bsd2;
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platforms = [ "aarch64-linux" ];
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};
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+
}