Rebase to flake parts #4

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";
+}