(untested) config for stinky and diff script.

hosts/stinky/hardware.nix

@@ -0,0 +1,53 @@
+{
+  config,
+  lib,
+  pkgs,
+  modulesPath,
+  ...
+}:
+{
+  imports = [
+    (modulesPath + "/installer/sd-card/sd-image-aarch64.nix")
+  ];
+
+  # Raspberry Pi 4 platform
+  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
+
+  # Boot configuration - provided by sd-image-aarch64.nix
+  # (grub disabled, generic-extlinux-compatible enabled, U-Boot setup)
+
+  # Override root filesystem to use tmpfs (from impermanence-tmpfs.nix)
+  # The sd-image module sets root to /dev/disk/by-label/NIXOS_SD (ext4)
+  # but impermanence-tmpfs.nix overrides it to tmpfs
+
+  # /boot/firmware is automatically configured by sd-image module
+  # Device: /dev/disk/by-label/FIRMWARE (vfat)
+
+  # Mount /nix from the NIXOS_SD partition
+  # /nix/persist will be a directory on this partition (not a separate mount)
+  fileSystems."/nix" = {
+    device = "/dev/disk/by-label/NIXOS_SD";
+    fsType = "ext4";
+    options = [ "noatime" ];
+    neededForBoot = true;
+  };
+
+  # No swap on SD card (wear concern)
+  swapDevices = [ ];
+
+  # SD image build configuration
+  sdImage = {
+    compressImage = true;
+
+    # Populate root with directories
+    populateRootCommands = ''
+      mkdir -p ./files/boot
+      ${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d ./files/boot
+
+      # Create /nix/persist directory structure for impermanence
+      mkdir -p ./files/nix/persist/var/lib/nixos
+      mkdir -p ./files/nix/persist/home/ppetru
+      mkdir -p ./files/nix/persist/etc
+    '';
+  };
+}