Use rpi vendor kernel 6.6.51

hosts/pi/hardware-configuration.nix

@@ -6,6 +6,25 @@
   ];
 
   boot = {
+    kernelPackages = let
+      version = "6.6.51";
+      tag = "stable_20241008";
+      srcHash = "sha256-phCxkuO+jUGZkfzSrBq6yErQeO2Td+inIGHxctXbD5U=";
+      in pkgs.linuxPackagesFor (pkgs.linux_rpi4.override {
+        argsOverride = {
+          src = pkgs.fetchFromGitHub {
+            owner = "raspberrypi";
+            repo = "linux";
+            rev = tag;
+            hash = srcHash;
+          };
+          version = version;
+          modDirVersion = version;
+          structuredExtraConfig = {};
+          kernelPatches = [];
+        };
+      });
+
     # Stop ZFS kernel being built
     supportedFilesystems = lib.mkForce [ "btrfs" "cifs" "f2fs" "jfs" "ntfs" "reiserfs" "vfat" "xfs" ];
     tmp.cleanOnBoot = true;
@@ -14,9 +33,24 @@
   # Fix missing modules
   # https://github.com/NixOS/nixpkgs/issues/154163
   nixpkgs.overlays = [
-    (final: super: {
+    (final: prev: {
       makeModulesClosure = x:
-        super.makeModulesClosure (x // { allowMissing = true; });
+        prev.makeModulesClosure (x // { allowMissing = true; });
+    })
+    (final: prev: {
+      raspberrypifw = let
+        version = "1.20241008";
+        srcHash = "sha256-4gnK0KbqFnjBmWia9Jt2gveVWftmHrprpwBqYVqE/k0=";
+        in pkgs.blah.override {
+          argsOverride = {
+            src = prev.fetchFromGitHub {
+              owner = "raspberrypi";
+              repo = "firmware";
+              rev = "${version}";
+              hash = srcHash;
+            };
+          };
+        };
     })
   ];