use system type as host

systems/pi4/default.nix

@@ -0,0 +1,43 @@
+{
+  modulesPath,
+  lib,
+  nixos-hardware,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+    nixos-hardware.nixosModules.raspberry-pi-4
+  ];
+
+  boot = {
+    initrd = {
+      availableKernelModules = [ "xhci_pci" ];
+    };
+    kernelPackages = pkgs.linuxPackages_latest;
+  };
+
+  boot.supportedFilesystems = lib.mkForce [
+    "btrfs"
+    "cifs"
+    "f2fs"
+    "jfs"
+    "ntfs"
+    "reiserfs"
+    "vfat"
+    "xfs"
+    "bchachefs"
+  ];
+
+  #hardware.raspberry-pi."4".fkms-3d.enable = true;
+
+  networking = {
+    useDHCP = lib.mkDefault true;
+  };
+
+  #services.openssh.settings.PermitRootLogin = lib.mkForce "yes";
+
+  powerManagement.cpuFreqGovernor = "ondemand";
+}