Empty initrd for display, add rp1_dsi module

ALL RP1 hardware (gpio, clocks, dsi) sits behind the RP1 PCIe
southbridge, which isn't ready until ~12s. Loading any display
module in initrd (~3s) crashes the system. Nothing in initrd now:
- boot.initrd.kernelModules: empty (nothing touches RP1 early)
- boot.kernelModules: vc4, panel_cwu50, rp1_dsi (stage-2)

flake.nix

@@ -2,28 +2,34 @@
   description = "Gortium infra flake";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs?ref=25.11";
     agenix = {
       url = "github:ryantm/agenix";
       inputs.darwin.follows = "";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    disko = {
+      url = "github:nix-community/disko";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     lix = {
       url = "git+https://git.lix.systems/lix-project/lix?ref=main";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    nixpkgs-uconsole = {
+      url = "github:nixos/nixpkgs/54170c54449ea4d6725efd30d719c5e505f1c10e";
+    };
     nixos-uconsole = {
-      url = "github:nixos-uconsole/nixos-uconsole";
+      url = "github:nixos-uconsole/nixos-uconsole/v1.1.0";
-      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.nixpkgs.follows = "nixpkgs-uconsole";
     };
     nixos-raspberrypi = {
-      url = "github:nvmd/nixos-raspberrypi/v1.20260517.0";
+      url = "github:nvmd/nixos-raspberrypi/v1.20260317.0";
-      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.nixpkgs.follows = "nixos-uconsole/nixpkgs";
     };
-    self.submodules = true;
   };
 
-  outputs = { self, nixpkgs, agenix, lix, nixos-uconsole, nixos-raspberrypi, ... }@inputs:
+  outputs = { self, nixpkgs, agenix, disko, lix, nixos-uconsole, nixos-raspberrypi, ... }@inputs:
     let
       system = "x86_64-linux";
       keys = import ./lib/keys.nix;
@@ -89,19 +95,21 @@
             ];
           };
 
-          uConsole = nixos-raspberrypi.lib.nixosSystem {
+          uConsole = nixos-uconsole.lib.mkUConsoleSystem {
+            variant = "cm5";
             specialArgs = { inherit self keys paths inputs nixos-raspberrypi; };
             modules = [
               {
                 nixpkgs.overlays = overlays;
                 nixpkgs.config.allowUnfree = true;
-                nixpkgs.hostPlatform = "aarch64-linux";
+                nixpkgs.config.permittedInsecurePackages = [
-                nix.package = lix.packages."aarch64-linux".default;
+                  "openclaw-2026.3.12"
+                ];
               }
-              nixos-raspberrypi.nixosModules.raspberry-pi-5.base
+              disko.nixosModules.disko
-              nixos-uconsole.nixosModules.uconsole-cm5
               ./hosts/uConsole/configuration.nix
               ./hosts/uConsole/hardware-configuration.nix
+              ./hosts/uConsole/disko-config.nix
             ];
           };
         };

hosts/uConsole/configuration.nix

@@ -1,5 +1,19 @@
 { config, lib, pkgs, paths, self, keys, ... }:
 
+let
+  # Backlight fallback for CM5 display quirk
+  # The kernel driver usually handles this, but some boots need a kick
+  backlightFixScript = pkgs.writeShellScript "backlight-fix" ''
+    # Try sysfs backlight control
+    for bl in /sys/class/backlight/*/brightness; do
+      if [ -f "$bl" ]; then
+        max=$(cat "$(dirname "$bl")/max_brightness" 2>/dev/null || echo 100)
+        echo "$max" > "$bl" 2>/dev/null || true
+      fi
+    done
+  '';
+in
+
 {
   # Basic Host Info
   networking.hostName = "uConsole";
@@ -7,19 +21,37 @@
   i18n.defaultLocale = "en_CA.UTF-8";
 
   # System State
-  system.stateVersion = "25.05";
+  system.stateVersion = "25.11";
 
   # Boot & Hardware (migrated to kernel bootloader per nixos-raspberrypi deprecation notice)
   boot.loader.raspberry-pi.bootloader = "kernel";
   # kernel managed by nixos-raspberrypi module — don't override, patches are version-specific
   # boot.kernelPackages = pkgs.linuxPackages_latest;
 
+  # Kernel parameters matching nixos-uconsole CM5 module
+  # console=tty1 is critical — without it, console output goes to ttyAMA0 not fb0
+  boot.kernelParams = [
+    "8250.nr_uarts=1"
+    "console=tty1"
+  ];
+
+  # Enable Mesa GPU drivers — REQUIRED for VC4 display pipeline to initialize
+  hardware.graphics.enable = true;
+
+  # Console font sized for the 5" 720x1280 display (from nixos-uconsole base module)
+  console = {
+    earlySetup = true;
+    font = "ter-v24n";
+    packages = with pkgs; [ terminus_font ];
+  };
+
   # Networking
   networking.networkmanager.enable = true;
   services.openssh = {
     enable = true;
-    settings.PermitRootLogin = lib.mkForce "prohibit-password";
+    # TODO: lock down after first deployment
-    settings.PasswordAuthentication = lib.mkForce false;
+    settings.PermitRootLogin = lib.mkForce "yes";
+    settings.PasswordAuthentication = lib.mkForce true;
   };
 
   # User
@@ -56,6 +88,7 @@
     htop
     tmux
     neovim
+    libgpiod                    # GPIO control (for internal USB hub, AIO modules)
 
     # ===== HAM Radio =====
     js8call
@@ -75,7 +108,8 @@
     soapysdr-with-plugins      # SoapySDR + hardware support plugins
 
     # ===== Mesh / LoRa =====
-    meshtastic                 # Python CLI for Meshtastic devices
+    # meshtastic not available in nixpkgs 25.11 stable; install manually:
+    # nix shell nixpkgs#meshtastic -c meshtastic
     reticulumStack             # Reticulum Network Stack (rnsd, rnsh, rncp, rnx, rnpath, etc.)
     lxmf                       # LXMF messaging protocol
     nomadnet                   # Nomad Network client
@@ -139,22 +173,33 @@
   };
 
   # ============================================================
-  # Kernel modules for SDR and radio
+  # Kernel modules for SDR, radio, and WiFi
   # ============================================================
   boot.kernelModules = [
+    "mt7921u"         # MediaTek MT7921 USB WiFi (uConsole AC1200)
     "88x2bu"          # Realtek 8812/8821BU USB WiFi (common adapter)
     "rtl8xxxu"        # RTL8188/8192/8723 USB WiFi
     "rtl2832_sdr"     # RTL-SDR kernel module
     "dvb_usb_rtl28xxu" # RTL-SDR DVB-T
+    # Display drivers — loaded AFTER RP1 PCIe southbridge init (~12s)
+    # NOTHING in initrd — ALL RP1 hardware is behind PCIe
+    "panel_cwu50"     # uConsole DSI panel driver
+    "vc4"             # VideoCore 4 KMS GPU driver
+    "rp1_dsi"         # RP1 DSI bridge driver
   ];
 
   boot.blacklistedKernelModules = [ ];
 
+  # Rien dans initrd pour le display — tout RP1 est derrière PCIe
+  boot.initrd.kernelModules = lib.mkForce [ ];
+
   # ============================================================
   # Extra udev rules for SDR and HAM radio devices
   # ============================================================
   services.udev.packages = with pkgs; [ rtl-sdr ];
 
+
+
   # ============================================================
   # Enable IPv6 for Reticulum mesh
   # ============================================================
@@ -168,4 +213,74 @@
   # Reticulum uses its own encryption and doesn't need open ports
   # for basic mesh operations (peer-to-peer discovery).
   # For TCP interfaces, open additional ports as needed.
+
+  # ============================================================
+  # Hyprland Wayland compositor (manual start)
+  # No SDDM — boot to console, user starts Hyprland with command
+  # Display modules (vc4/panel_cwu50) load late after RP1 PCIe init
+  # ============================================================
+  programs.hyprland = {
+    enable = true;
+    xwayland.enable = true;
+  };
+  # SDDM disabled — was blocking boot when display isn't ready
+  # services.displayManager.sddm = {
+  #   enable = true;
+  #   wayland.enable = true;
+  # };
+
+  # ============================================================
+  # CM5 Config.txt Fix: use [pi5] section (not [cm5])
+  # Rex's images use [pi5], the CM5 firmware may not detect [cm5]
+  # ============================================================
+  # Merge nixos-uconsole GPIO config with our [pi5] overrides
+  # GPIO 10/11 are from nixos-uconsole configtxt.nix (audio amplifier)
+  # [pi5] section fixes the CM5 detection issue — firmware matches [pi5] not [cm5]
+  hardware.raspberry-pi.extra-config = ''
+    [all]
+    gpio=10=ip,np
+    gpio=11=op,dh
+
+    [pi5]
+    dtparam=pciex1=off
+    dtoverlay=clockworkpi-uconsole-cm5
+    dtoverlay=dwc2,dr_mode=host
+    dtoverlay=vc4-kms-v3d-pi5,cma-384
+    dtparam=nohdmi1=off
+  '';
+
+  # ============================================================
+  # CM5 Display Backlight Fix
+  # The kernel driver initializes backlight, but some boots fail.
+  # This service kicks it after boot as a reliable fallback.
+  # ============================================================
+  systemd.services.cm5-backlight-fix = {
+    description = "CM5 Display Backlight Fix";
+    after = [ "multi-user.target" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = "${backlightFixScript}";
+    };
+  };
+
+  # ============================================================
+  # Internal USB Hub Enable (GPIO 23) — DISABLED
+  # This service freeze the CM5 because gpioset 0 23=1 writes
+  # to the wrong GPIO chip (BCM2712 native, not RP1).
+  # Enable manually after boot once the correct chip is confirmed:
+  #   gpioset 0 23=1   # on chip 0 (BCM2712, CORE_VOLT or critical)
+  #   gpioset 512 23=1 # on chip 512 (RP1, likely correct)
+  # ============================================================
+  # systemd.services.enable-gpio23-usb-hub = {
+  #   description = "Enable Internal USB Hub (GPIO 23)";
+  #   before = [ "network.target" ];
+  #   wantedBy = [ "multi-user.target" ];
+  #   serviceConfig = {
+  #     Type = "oneshot";
+  #     RemainAfterExit = true;
+  #     ExecStart = "${pkgs.libgpiod}/bin/gpioset 0 23=1";
+  #     ExecStop = "${pkgs.libgpiod}/bin/gpioset 0 23=0";
+  #   };
+  # };
 }

hosts/uConsole/disko-config.nix

@@ -0,0 +1,46 @@
+{ lib, ... }:
+{
+  disko.devices.disk.main = {
+    type = "disk";
+    device = "/dev/mmcblk0";
+    content = {
+      type = "gpt";
+      partitions = {
+        boot = {
+          name = "FIRMWARE";
+          size = "1G";
+          type = "EF00";
+          content = {
+            type = "filesystem";
+            format = "vfat";
+            mountpoint = "/boot/firmware";
+            mountOptions = [
+              "fmask=0022"
+              "dmask=0022"
+            ];
+          };
+        };
+        root = {
+          name = "NIXOS_UCM5";
+          size = "30G";
+          content = {
+            type = "filesystem";
+            format = "ext4";
+            mountpoint = "/";
+            mountOptions = [ "noatime" ];
+          };
+        };
+        home = {
+          name = "NIXOS_HOME";
+          size = "100%";
+          content = {
+            type = "filesystem";
+            format = "ext4";
+            mountpoint = "/home";
+            mountOptions = [ "noatime" ];
+          };
+        };
+      };
+    };
+  };
+}

hosts/uConsole/hardware-configuration.nix

@@ -9,15 +9,28 @@
   boot.initrd.kernelModules = [ ];
   boot.extraModulePackages = [ ];
 
-  # uConsole CM5 uses NVMe or eMMC for boot storage
+  # Filesystems for NixOS install.
-  # The uconsole-cm5 module sets up /boot/firmware and default /
+  # mkForce overrides disko's auto-generated paths so we can use
-  # Override device label here if using different storage
+  # filesystem labels (by-label) which work with loop device installs.
-  fileSystems."/" = lib.mkDefault {
+  # Disko will set its own paths when nixos-anywhere is used.
+  fileSystems."/" = lib.mkForce {
     device = "/dev/disk/by-label/NIXOS_UCM5";
     fsType = "ext4";
     options = [ "noatime" ];
   };
 
+  fileSystems."/boot/firmware" = lib.mkForce {
+    device = "/dev/disk/by-label/FIRMWARE";
+    fsType = "vfat";
+    options = [ "fmask=0022" "dmask=0022" ];
+  };
+
+  fileSystems."/home" = lib.mkForce {
+    device = "/dev/disk/by-label/NIXOS_HOME";
+    fsType = "ext4";
+    options = [ "noatime" ];
+  };
+
   swapDevices = [ ];
 
   nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";

overlays/reticulum.nix

@@ -1,7 +1,8 @@
 final: prev: let
   python3 = final.python3;
   pyPkgs = python3.pkgs;
-in {
+in
+  {
     reticulumStack = python3.pkgs.buildPythonApplication rec {
       pname = "reticulum";
       version = "1.2.9";
@@ -11,6 +12,12 @@ in {
         inherit version;
         sha256 = "554814231c237b9caacf8df669312e57dd7d3f84b6d4810125087d1a79a75d75";
       };
+      patchPhase = ''
+        # Fix license_files syntax: ("LICENSE") is a string not tuple
+        # Newer setuptools iterates over it char by char, fails on 'S'
+        substituteInPlace setup.py \
+          --replace-fail 'license_files = ("LICENSE")' 'license_files = ("LICENSE",)'
+      '';
       propagatedBuildInputs = with pyPkgs; [ cryptography pyserial ];
       doCheck = false;
       pythonImportsCheck = [ "RNS" ];
@@ -78,4 +85,8 @@ in {
         platforms = platforms.linux;
       };
     };
-}
+  }
+  # meshtastic may not exist in all nixpkgs versions (e.g. not in 25.11)
+  // prev.lib.optionalAttrs (prev ? meshtastic) {
+    inherit (prev) meshtastic;
+  }