Rebase to flake parts #4

modules/hosts/uConsole/_private/4g/default.nix

@@ -0,0 +1,37 @@
+{ lib, pkgs, ... }:
+let
+  uconsole4gRuntime = with pkgs; [
+    bash
+    coreutils
+    gnugrep
+    gnused
+    gawk
+    util-linux
+    usbutils
+    pciutils
+    lsb-release
+    libgpiod
+    modemmanager
+    iproute2
+    iputils
+    busybox
+    socat
+    systemd
+  ];
+
+  # Use a lightweight wrapper to avoid ShellCheck gating the build.
+  uconsole4gCm5 = pkgs.writeShellScriptBin "uconsole-4g-cm5" ''
+    export PATH=${lib.makeBinPath uconsole4gRuntime}:$PATH
+    exec ${pkgs.bash}/bin/bash ${./uconsole-4g-cm5.sh} "$@"
+  '';
+in
+{
+  networking.modemmanager.enable = true;
+
+  environment.systemPackages = with pkgs; [
+    libgpiod
+    uconsole4gCm5
+    socat
+    ripgrep
+  ];
+}

modules/hosts/uConsole/_private/activation.nix

@@ -0,0 +1,16 @@
+{ pkgs, ... }: {
+  # Keep Raspberry Pi kernel cmdline in sync with current system profile.
+  system.activationScripts.updateRpiCmdline.text = ''
+    export PATH="${pkgs.gnused}/bin:''${PATH}"
+    for cmdline in /boot/firmware/nixos/*/cmdline.txt; do
+      [ -e "$cmdline" ] || continue
+      current_init="$(readlink -f /nix/var/nix/profiles/system)/init"
+      if grep -q 'init=/nix/store/' "$cmdline"; then
+        sed -i "s#init=/nix/store/[^ ]*/init#init=$current_init#" "$cmdline"
+      fi
+      if ! grep -q 'root=' "$cmdline"; then
+        sed -i 's/ init=/ root=PARTUUID=4d44c78a-ee3c-4e3e-9eee-0f2eb10347b6 rootfstype=ext4 init=/' "$cmdline"
+      fi
+    done
+  '';
+}

modules/hosts/uConsole/_private/platform.nix

@@ -0,0 +1,48 @@
+{ ... }: {
+  #TODO[epic=Moderate] Clean this up, move to host's configuration.nix.
+  # Native Raspberry Pi boot flow.
+  boot.loader.raspberry-pi.bootloader = "kernel";
+  boot.loader.grub.enable = false;
+  boot.consoleLogLevel = 7;
+  boot.kernelModules = [ "nvme" ];
+
+  # Root device for kernel cmdline (NVMe boot).
+  boot.kernelParams = [
+    "root=PARTUUID=4d44c78a-ee3c-4e3e-9eee-0f2eb10347b6"
+    "rootfstype=ext4"
+  ];
+
+  console = {
+    earlySetup = true;
+    font = "ter-v32n";
+  };
+
+  # Enable PCIe x1 for CM5 NVMe adapter.
+  hardware.raspberry-pi.config.cm5.base-dt-params.pciex1 = {
+    enable = true;
+    value = "on";
+  };
+
+  powerManagement.cpuFreqGovernor = "powersave";
+
+  # Root + firmware as boot-critical mounts.
+  fileSystems."/".neededForBoot = true;
+  fileSystems."/boot/firmware".neededForBoot = true;
+
+  # Pi generational boot expects boot-firmware.mount to exist.
+  systemd.mounts = [
+    {
+      what = "/dev/disk/by-label/FIRMWARE";
+      where = "/boot/firmware";
+      type = "vfat";
+      options = "noatime,fmask=0022,dmask=0022";
+      wantedBy = [ "local-fs.target" ];
+      after = [ "local-fs-pre.target" ];
+    }
+  ];
+
+  # There is no serial console on uConsole CM5 by default.
+  systemd.services."serial-getty@ttyS0".enable = false;
+
+  system.stateVersion = "25.11";
+}

modules/hosts/uConsole/_private/services.nix

@@ -0,0 +1,6 @@
+{ ... }: {
+  #TODO[epic=Moderate] Clean this up, move to host's configuration.nix.
+  # Enable uinput for gamepad remap.
+  hardware.uinput.enable = true;
+  programs.mosh.enable = true;
+}