diff --git a/flake.nix b/flake.nix
index 7f2f112..c8966ff 100644
--- a/flake.nix
+++ b/flake.nix
@@ -228,12 +228,12 @@
           pi5 = {
             modules = with inputs; [
               disko.nixosModules.disko
-              nixos-raspberrypi.nixosModules.raspberry-pi-5.base
-              nixos-raspberrypi.nixosModules.raspberry-pi-5.display-vc4
-              nixos-raspberrypi.nixosModules.raspberry-pi-5.bluetooth
-              nixos-raspberrypi.nixosModules.raspberry-pi-5.page-size-16k
-              nixos-raspberrypi.nixosModules.nixpkgs-rpi
-              nixos-raspberrypi.nixosModules.trusted-nix-caches
+              # nixos-raspberrypi.nixosModules.raspberry-pi-5.base
+              # nixos-raspberrypi.nixosModules.raspberry-pi-5.display-vc4
+              # nixos-raspberrypi.nixosModules.raspberry-pi-5.bluetooth
+              # nixos-raspberrypi.nixosModules.raspberry-pi-5.page-size-16k
+              # nixos-raspberrypi.nixosModules.nixpkgs-rpi
+              # nixos-raspberrypi.nixosModules.trusted-nix-caches
               # nixos-raspberrypi.lib.inject-overlays
               # nixos-raspberrypi.lib.inject-overlays-global
             ];
diff --git a/modules/nixos/hardware/raspberry-pi/apply-overlays-dtmerge.nix b/modules/nixos/hardware/raspberry-pi/apply-overlays-dtmerge.nix
new file mode 100644
index 0000000..2111ce2
--- /dev/null
+++ b/modules/nixos/hardware/raspberry-pi/apply-overlays-dtmerge.nix
@@ -0,0 +1,67 @@
+# modification of nixpkgs deviceTree.applyOverlays to resolve https://github.com/NixOS/nixpkgs/issues/125354
+# derived from https://github.com/NixOS/nixpkgs/blob/916ca8f2b0c208def051f8ea9760c534a40309db/pkgs/os-specific/linux/device-tree/default.nix
+{
+  lib,
+  stdenvNoCC,
+  dtc,
+  libraspberrypi,
+}:
+
+with lib;
+(
+  base: overlays':
+  stdenvNoCC.mkDerivation {
+    name = "device-tree-overlays";
+    nativeBuildInputs = [
+      dtc
+      libraspberrypi
+    ];
+    buildCommand =
+      let
+        overlays = toList overlays';
+      in
+      ''
+        mkdir -p $out
+        cd "${base}"
+        find . -type f -name '*.dtb' -print0 \
+          | xargs -0 cp -v --no-preserve=mode --target-directory "$out" --parents
+
+        for dtb in $(find "$out" -type f -name '*.dtb'); do
+          dtbCompat=$(fdtget -t s "$dtb" / compatible 2>/dev/null || true)
+          # skip files without `compatible` string
+          test -z "$dtbCompat" && continue
+
+          ${flip (concatMapStringsSep "\n") overlays (o: ''
+            overlayCompat="$(fdtget -t s "${o.dtboFile}" / compatible)"
+
+            # skip incompatible and non-matching overlays
+            if [[ ! "$dtbCompat" =~ "$overlayCompat" ]]; then
+              echo "Skipping overlay ${o.name}: incompatible with $(basename "$dtb")"
+            elif ${
+              if ((o.filter or null) == null) then
+                "false"
+              else
+                ''
+                  [[ "''${dtb//${o.filter}/}" ==  "$dtb" ]]
+                ''
+            }
+            then
+              echo "Skipping overlay ${o.name}: filter does not match $(basename "$dtb")"
+            else
+              echo -n "Applying overlay ${o.name} to $(basename "$dtb")... "
+              mv "$dtb"{,.in}
+
+              # dtmerge requires a .dtbo ext for dtbo files, otherwise it adds it to the given file implicitly
+              dtboWithExt="$TMPDIR/$(basename "${o.dtboFile}").dtbo"
+              cp -r ${o.dtboFile} "$dtboWithExt"
+
+              dtmerge "$dtb.in" "$dtb" "$dtboWithExt"
+
+              echo "ok"
+              rm "$dtb.in" "$dtboWithExt"
+            fi
+          '')}
+
+        done'';
+  }
+)
\ No newline at end of file
diff --git a/modules/nixos/hardware/raspberry-pi/default.nix b/modules/nixos/hardware/raspberry-pi/default.nix
index 85e0d67..c9da5ca 100644
--- a/modules/nixos/hardware/raspberry-pi/default.nix
+++ b/modules/nixos/hardware/raspberry-pi/default.nix
@@ -7,6 +7,11 @@
 }:
 let
   cfg = config.${namespace}.hardware.raspberry-pi;
+  dt_ao_overlay = _final: prev: {
+    deviceTree = prev.deviceTree // {
+      applyOverlays = _final.callPackage ./apply-overlays-dtmerge.nix { };
+    };
+  };
 in
 {
   options.${namespace}.hardware.raspberry-pi = {
@@ -19,13 +24,40 @@ in
       ];
       description = "Raspberry Pi variant (4 or 5)";
     };
+    
+    apply-overlays-dtmerge = {
+      enable = lib.mkEnableOption "" // {
+        description = ''
+          Whether replace deviceTree.applyOverlays implementation to use dtmerge from libraspberrypi.
+          This can resolve issues with applying dtbs for the pi.
+        '';
+      };
+    };
   };
 
+  imports = [
+    ./leds.nix
+  ];
+
   config = lib.mkIf cfg.enable {
 
-    boot.initrd.availableKernelModules = lib.mkIf (cfg.variant == "5") [
-      "nvme"
-    ];
+    boot = {
+      initrd.availableKernelModules = [
+        "usbhid"
+        "usb-storage"
+      ] ++ (if (cfg.variant == "5") then [
+        "nvme"
+      ] else
+      [
+        "vc4"
+        "pcie-brcmstb" # required for the pcie bus to work
+        "reset-raspberrypi" # required for vl805 firmware to load
+      ]);
+      loader = {
+        generic-extlinux-compatible.enable = lib.mkDefault true;
+        grub.enable = lib.mkForce false;
+      };
+    };
 
     # Common Raspberry Pi packages
     environment.systemPackages = with pkgs; [
@@ -58,21 +90,65 @@ in
 
     # Common hardware settings
     hardware = {
-      i2c.enable = lib.mkDefault true;
+      deviceTree = {
+        filter = lib.mkDefault (if (cfg.variant == "5") then "bcm2712-rpi-*.dtb" else "bcm2711-rpi-*.dtb");
+        overlays = lib.mkIf (cfg.variant == "4") [
+          {
+            name = "rpi4-cpu-revision";
+            dtsText = ''
+              /dts-v1/;
+              /plugin/;
+
+              / {
+                compatible = "raspberrypi,4-model-b";
+
+                fragment@0 {
+                  target-path = "/";
+                  __overlay__ {
+                    system {
+                      linux,revision = <0x00d03114>;
+                    };
+                  };
+                };
+              };
+            '';
+          }
+          {
+            name = "enable-xhci";
+            dtsText = ''
+              /dts-v1/;
+              /plugin/;
+
+              / {
+                compatible = "brcm,bcm2711";
+                fragment@0 {
+                  //target-path = "/scb/xhci@7e9c0000";
+                  target = <&xhci>;
+                  __overlay__ {
+                    status = "okay";
+                  };
+                };
+              };
+            '';
+          }
+        ];
+      };
+      firmware = [ pkgs.${namespace}.raspberryPiWirelessFirmware ];
       graphics.enable32Bit = lib.mkForce false;
+      i2c.enable = lib.mkDefault true;
     };
 
     # Pi specific system tags
-    system.nixos.tags = (
-      let
-        bootCfg = config.boot.loader.raspberry-pi;
-      in
-      [
-        "raspberry-pi-${bootCfg.variant}"
-        bootCfg.bootloader
-        config.boot.kernelPackages.kernel.version
-      ]
-    );
+    # system.nixos.tags = (
+    #   let
+    #     bootCfg = config.boot.loader.raspberry-pi;
+    #   in
+    #   [
+    #     "raspberry-pi-${bootCfg.variant}"
+    #     bootCfg.bootloader
+    #     config.boot.kernelPackages.kernel.version
+    #   ]
+    # );
 
     # Common programs
     programs.kdeconnect.enable = lib.mkDefault false;
@@ -164,6 +240,7 @@ in
             ++ [ "${pageSizeFlag}=14" ];
         });
       })
-    ] else [ ]);
+    ] else [ ])
+    ++ (if cfg.apply-overlays-dtmerge.enable then [ dt_ao_overlay ] else [ ]);
   };
 }
diff --git a/modules/nixos/hardware/raspberry-pi/leds.nix b/modules/nixos/hardware/raspberry-pi/leds.nix
new file mode 100644
index 0000000..0fc1db6
--- /dev/null
+++ b/modules/nixos/hardware/raspberry-pi/leds.nix
@@ -0,0 +1,132 @@
+{ config, lib, namespace, ... }:
+
+let
+  cfg = config.${namespace}.hardware.raspberry-pi.leds;
+  mkDisableOption =
+    name:
+    lib.mkOption {
+      default = false;
+      example = true;
+      description = "Whether to disable ${name}.";
+      type = lib.types.bool;
+    };
+in
+{
+  options.${namespace}.hardware = {
+    raspberry-pi.leds = {
+      eth.disable = mkDisableOption ''ethernet LEDs.'';
+      act.disable = mkDisableOption ''activity LED.'';
+      pwr.disable = mkDisableOption ''power LED.'';
+    };
+  };
+
+  # Adapted from: https://gist.github.com/SFrijters/206d2c09656affb04284f076c75a1969
+  config = lib.mkMerge [
+    (lib.mkIf (cfg.eth.disable || cfg.act.disable || cfg.pwr.disable) {
+      ${namespace}.hardware.raspberry-pi.apply-overlays-dtmerge.enable = lib.mkDefault true;
+      hardware.deviceTree.filter = "*-rpi-4-*.dtb";
+    })
+    (lib.mkIf cfg.eth.disable {
+      hardware.deviceTree = {
+        overlays = [
+          # https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README
+          # eth_led0                Set mode of LED0 - amber on Pi3B+ (default "1"),
+          #                         green on Pi4 (default "0").
+          #                         The legal values are:
+          #
+          #                         Pi4
+          #
+          #                         0=Speed/Activity         1=Speed
+          #                         2=Flash activity         3=FDX
+          #                         4=Off                    5=On
+          #                         6=Alt                    7=Speed/Flash
+          #                         8=Link                   9=Activity
+          #
+          # Debugging:
+          # $ hexdump /proc/device-tree/scb/ethernet@7d580000/mdio@e14/ethernet-phy@1/led-modes
+          {
+            name = "disable-eth-leds";
+            filter = "*rpi-4-b*";
+            dtsText = ''
+              /dts-v1/;
+              /plugin/;
+              /{
+                  compatible = "raspberrypi,4-model-b";
+                  fragment@0 {
+                      target = <&phy1>;
+                      __overlay__ {
+                          led-modes = <0x04 0x04>;
+                      };
+                  };
+              };
+            '';
+          }
+        ];
+      };
+    })
+    (lib.mkIf cfg.act.disable {
+      hardware.deviceTree = {
+        overlays = [
+          # Debugging:
+          # $ hexdump /proc/device-tree/leds/led-act/gpios
+          # $ cat /proc/device-tree/leds/led-act/linux,default-trigger
+          {
+            name = "disable-act-led";
+            filter = "*rpi-4-b*";
+            dtsText =
+              let
+                kernelVersion = lib.versionAtLeast config.boot.kernelPackages.kernel.version "6.2";
+                target = if kernelVersion then "<&led_act>" else "<&act_led>";
+              in
+              ''
+                /dts-v1/;
+                /plugin/;
+                /{
+                    compatible = "raspberrypi,4-model-b";
+                    fragment@0 {
+                        target = ${target};
+                        __overlay__ {
+                            gpios = <&gpio 42 0>; /* first two values copied from bcm2711-rpi-4-b.dts */
+                            linux,default-trigger = "none";
+                        };
+                    };
+                };
+              '';
+          }
+        ];
+      };
+    })
+    (lib.mkIf cfg.pwr.disable {
+      hardware.deviceTree = {
+        overlays = [
+          # Debugging:
+          # $ hexdump /proc/device-tree/leds/led-pwr/gpios
+          # $ cat /proc/device-tree/leds/led-pwr/linux,default-trigger
+          {
+            name = "disable-pwr-led";
+            filter = "*rpi-4-b*";
+            dtsText =
+              let
+                kernelVersion = lib.versionAtLeast config.boot.kernelPackages.kernel.version "6.2";
+                target = if kernelVersion then "<&led_pwr>" else "<&pwr_led>";
+              in
+              ''
+                /dts-v1/;
+                /plugin/;
+                /{
+                    compatible = "raspberrypi,4-model-b";
+                    fragment@0 {
+                        target = ${target};
+                        __overlay__ {
+                            gpios = <&expgpio 2 0>; /* first two values copied from bcm2711-rpi-4-b.dts */
+                            linux,default-trigger = "default-on";
+                        };
+                    };
+                };
+              '';
+          }
+        ];
+      };
+    })
+  ];
+}
\ No newline at end of file
diff --git a/modules/nixos/nix/default.nix b/modules/nixos/nix/default.nix
index 1552a15..68e8ac2 100644
--- a/modules/nixos/nix/default.nix
+++ b/modules/nixos/nix/default.nix
@@ -27,21 +27,22 @@ in
       "jemalloc"
       "jupiter-fan-control"
       "libcamera-rpi"
+      "${namespace}.libraspberrypi"
       "libsecret"
       "linux"
-      "linux-rpi"
-      "linuxPackages_cachyos"
-      "linuxPackages_cachyos-lto"
-      "linuxPackages_cachyos-lto-znver4"
-      "linuxPackages_cachyos-server"
-      "linuxPackages_cachyos-server-lto"
-      "linuxPackages_cachyos-server-lto-znver4"
-      "linuxPackages_cachyos-rc"
-      "linuxPackages_cachyos-rc-lto"
-      "linuxPackages_cachyos-rc-lto-znver4"
-      "linuxPackages_cachyos-hardened"
-      "linuxPackages_cachyos-hardened-lto"
-      "linuxPackages_cachyos-hardened-lto-znver4"
+      "${namespace}.linux-rpi"
+      "${namespace}.linuxPackages_cachyos"
+      "${namespace}.linuxPackages_cachyos-lto"
+      "${namespace}.linuxPackages_cachyos-lto-znver4"
+      "${namespace}.linuxPackages_cachyos-server"
+      "${namespace}.linuxPackages_cachyos-server-lto"
+      "${namespace}.linuxPackages_cachyos-server-lto-znver4"
+      "${namespace}.linuxPackages_cachyos-rc"
+      "${namespace}.linuxPackages_cachyos-rc-lto"
+      "${namespace}.linuxPackages_cachyos-rc-lto-znver4"
+      "${namespace}.linuxPackages_cachyos-hardened"
+      "${namespace}.linuxPackages_cachyos-hardened-lto"
+      "${namespace}.linuxPackages_cachyos-hardened-lto-znver4"
       "mesa"
       "mesa_i686"
       "mesa-radeonsi-jupiter"
@@ -59,6 +60,7 @@ in
       "qt3d"
       "qtdeclarative"
       "qtmultimedia"
+      "${namespace}.raspberrypi-utils"
       "ryubing"
       "sdl"
       "sdl2"
@@ -71,13 +73,10 @@ in
 
   nixpkgs.overlays = [
     (_self: super: {
-        ${namespace} = super.${namespace} // {
-          linux-rpi = super.${namespace}.linux-rpi.override { stdenv = super.ccacheStdenv; };
-          linuxPackages_rpi4 = super.linuxPackagesFor (super.${namespace}.linux-rpi.override { stdenv = super.ccacheStdenv; rpiVersion = 4; });
-          linuxPackages_rpi5 = super.linuxPackagesFor (super.${namespace}.linux-rpi.override { stdenv = super.ccacheStdenv; });
-          libraspberrypi = super.${namespace}.libraspberrypi.override { stdenv = super.ccacheStdenv; };
-          raspberrypi-utils = super.${namespace}.raspberrypi-utils.override { stdenv = super.ccacheStdenv; };
-        };
+       ${namespace} = super.${namespace} // {
+         linuxPackages_rpi5 = super.linuxPackagesFor (super.${namespace}.linux-rpi.override { stdenv = super.ccacheStdenv; });
+         linuxPackages_rpi4 = super.linuxPackagesFor (super.${namespace}.linux-rpi.override { stdenv = super.ccacheStdenv; rpiVersion = 4; });
+       };
     })
     
     (_self: super: {
diff --git a/overlays/linux-cachyos/default.nix b/overlays/linux-cachyos/default.nix
index 82e7b22..42b50d5 100644
--- a/overlays/linux-cachyos/default.nix
+++ b/overlays/linux-cachyos/default.nix
@@ -1,6 +1,6 @@
-{ inputs, self, ... }:
+{ inputs, self, namespace, ... }:
 
-final: _prev:
+final: prev:
 let
   cachyosPackages = final.callPackage ../../packages/linux-cachyos {
     pkgs = final;
@@ -9,27 +9,29 @@ let
   };
 in
 {
-  # GCC Kernels
-  # Latest
-  linuxPackages_cachyos = cachyosPackages.cachyos-gcc;
-  linuxPackages_cachyos-gcc = cachyosPackages.cachyos-gcc;
-  # Latest Server
-  linuxPackages_cachyos-server = cachyosPackages.cachyos-server;
-  # Hardened
-  linuxPackages_cachyos-hardened = cachyosPackages.cachyos-hardened;
-  # RC
-  linuxPackages_cachyos-rc = cachyosPackages.cachyos-rc;
-  # LTS
-  linuxPackages_cachyos-lts = cachyosPackages.cachyos-lts;
+  ${namespace} = prev.${namespace} // {
+    # GCC Kernels
+    # Latest
+    linuxPackages_cachyos = cachyosPackages.cachyos-gcc;
+    linuxPackages_cachyos-gcc = cachyosPackages.cachyos-gcc;
+    # Latest Server
+    linuxPackages_cachyos-server = cachyosPackages.cachyos-server;
+    # Hardened
+    linuxPackages_cachyos-hardened = cachyosPackages.cachyos-hardened;
+    # RC
+    linuxPackages_cachyos-rc = cachyosPackages.cachyos-rc;
+    # LTS
+    linuxPackages_cachyos-lts = cachyosPackages.cachyos-lts;
 
-  # Clang Kernels
-  # Latest
-  linuxPackages_cachyos-lto = cachyosPackages.cachyos-lto;
-  linuxPackages_cachyos-lto-znver4 = cachyosPackages.cachyos-lto-znver4;
-  # Latest Server
-  linuxPackages_cachyos-server-lto = cachyosPackages.cachyos-server-lto;
-  linuxPackages_cachyos-server-lto-znver4 = cachyosPackages.cachyos-server-lto-znver4;
-  # RC
-  linuxPackages_cachyos-rc-lto = cachyosPackages.cachyos-rc-lto;
-  linuxPackages_cachyos-rc-lto-znver4 = cachyosPackages.cachyos-rc-lto-znver4;
+    # Clang Kernels
+    # Latest
+    linuxPackages_cachyos-lto = cachyosPackages.cachyos-lto;
+    linuxPackages_cachyos-lto-znver4 = cachyosPackages.cachyos-lto-znver4;
+    # Latest Server
+    linuxPackages_cachyos-server-lto = cachyosPackages.cachyos-server-lto;
+    linuxPackages_cachyos-server-lto-znver4 = cachyosPackages.cachyos-server-lto-znver4;
+    # RC
+    linuxPackages_cachyos-rc-lto = cachyosPackages.cachyos-rc-lto;
+    linuxPackages_cachyos-rc-lto-znver4 = cachyosPackages.cachyos-rc-lto-znver4;
+  };
 }
diff --git a/overlays/linux-rpi/default.nix b/overlays/linux-rpi/default.nix
deleted file mode 100644
index 7052ce0..0000000
--- a/overlays/linux-rpi/default.nix
+++ /dev/null
@@ -1,22 +0,0 @@
-{ inputs, self, namespace, ... }:
-
-final: _prev:
-let
-  pi5 = final.callPackage ../../packages/raspberrypi/linux-rpi/default.nix {
-    pkgs = final;
-    nixpkgs = inputs.nixpkgs;
-    inherit self;
-  };
-  pi4 = final.callPackage ../../packages/raspberrypi/linux-rpi/default.nix {
-    pkgs = final;
-    nixpkgs = inputs.nixpkgs;
-    rpiVersion = 4;
-    inherit self;
-  };
-in
-{
-  # ${namespace} = final.${namespace} // {
-#    linuxPackages_rpi5 = final.linuxPackagesFor pi5;
-    linuxPackages_rpi4 = final.linuxPackagesFor pi4;
-  # };
-}
diff --git a/packages/raspberrypi/libraspberrypi/default.nix b/packages/raspberrypi/libraspberrypi/default.nix
index 09d1eb2..3d7bbdd 100644
--- a/packages/raspberrypi/libraspberrypi/default.nix
+++ b/packages/raspberrypi/libraspberrypi/default.nix
@@ -1,13 +1,10 @@
 {
   lib,
-  ccacheStdenv,
+  stdenv,
   fetchFromGitHub,
   cmake,
   pkg-config,
 }:
-let
-  stdenv = ccacheStdenv;
-in
 stdenv.mkDerivation (_finalAttrs: {
   pname = "libraspberrypi";
   version = "unstable-2024-12-23";
diff --git a/packages/raspberrypi/linux-rpi/default.nix b/packages/raspberrypi/linux-rpi/default.nix
index c1e4c10..ca3da41 100644
--- a/packages/raspberrypi/linux-rpi/default.nix
+++ b/packages/raspberrypi/linux-rpi/default.nix
@@ -1,5 +1,6 @@
 {
-  ccacheStdenv,
+  # ccacheStdenv,
+  stdenv,
   lib,
   fetchFromGitHub,
   buildLinux,
@@ -8,7 +9,7 @@
 }@args:
 
 let
-  stdenv = ccacheStdenv;
+  # stdenv = ccacheStdenv;
   modDirVersion = "6.12.47";
   tag = "stable_20250916";
   hash = "sha256-HG8Oc04V2t54l0SOn4gKmNJWQUrZfjWusgKcWvx74H0==";
diff --git a/packages/raspberrypi/raspberrypi-utils/default.nix b/packages/raspberrypi/raspberrypi-utils/default.nix
index a5b72d5..74a16da 100644
--- a/packages/raspberrypi/raspberrypi-utils/default.nix
+++ b/packages/raspberrypi/raspberrypi-utils/default.nix
@@ -2,14 +2,11 @@
 # because libraspberrypi is outdated and deprecated
 {
   lib,
-  ccacheStdenv,
+  stdenv,
   fetchFromGitHub,
   cmake,
   dtc,
 }:
-let
-  stdenv = ccacheStdenv;
-in
 stdenv.mkDerivation (_finalAttrs: {
   pname = "raspberrypi-utils";
   version = "unstable-2025-12-26";
diff --git a/systems/aarch64-linux/pi5/boot.nix b/systems/aarch64-linux/pi5/boot.nix
index 97d0f78..7e531cf 100755
--- a/systems/aarch64-linux/pi5/boot.nix
+++ b/systems/aarch64-linux/pi5/boot.nix
@@ -4,54 +4,54 @@ let
 in
 {
   boot = {
-    loader.raspberry-pi = {
-      bootloader = "kernel";
-      firmwarePackage = pkgs.raspberrypifw;
-    };
-    kernelPackages = pkgs.linuxPackages_rpi5;
+    # loader.raspberry-pi = {
+    #   bootloader = "kernel";
+    #   firmwarePackage = pkgs.raspberrypifw;
+    # };
+    kernelPackages = pkgs.${namespace}.linuxPackages_rpi5;
     supportedFilesystems = lib.mkForce [ ];
   };
 
-  hardware.raspberry-pi.config = {
-    all = {
-      # [all] conditional filter, https://www.raspberrypi.com/documentation/computers/config_txt.html#conditional-filters
+  # hardware.raspberry-pi.config = {
+  #   all = {
+  #     # [all] conditional filter, https://www.raspberrypi.com/documentation/computers/config_txt.html#conditional-filters
 
-      options = {
-        # https://www.raspberrypi.com/documentation/computers/config_txt.html#enable_uart
-        # in conjunction with `console=serial0,115200` in kernel command line (`cmdline.txt`)
-        # creates a serial console, accessible using GPIOs 14 and 15 (pins
-        #  8 and 10 on the 40-pin header)
-        enable_uart = {
-          enable = true;
-          value = true;
-        };
-        # https://www.raspberrypi.com/documentation/computers/config_txt.html#uart_2ndstage
-        # enable debug logging to the UART, also automatically enables
-        # UART logging in `start.elf`
-        uart_2ndstage = {
-          enable = true;
-          value = true;
-        };
-      };
+  #     options = {
+  #       # https://www.raspberrypi.com/documentation/computers/config_txt.html#enable_uart
+  #       # in conjunction with `console=serial0,115200` in kernel command line (`cmdline.txt`)
+  #       # creates a serial console, accessible using GPIOs 14 and 15 (pins
+  #       #  8 and 10 on the 40-pin header)
+  #       enable_uart = {
+  #         enable = true;
+  #         value = true;
+  #       };
+  #       # https://www.raspberrypi.com/documentation/computers/config_txt.html#uart_2ndstage
+  #       # enable debug logging to the UART, also automatically enables
+  #       # UART logging in `start.elf`
+  #       uart_2ndstage = {
+  #         enable = true;
+  #         value = true;
+  #       };
+  #     };
 
-      # Base DTB parameters
-      # https://github.com/raspberrypi/linux/blob/a1d3defcca200077e1e382fe049ca613d16efd2b/arch/arm/boot/dts/overlays/README#L132
-      base-dt-params = {
+  #     # Base DTB parameters
+  #     # https://github.com/raspberrypi/linux/blob/a1d3defcca200077e1e382fe049ca613d16efd2b/arch/arm/boot/dts/overlays/README#L132
+  #     base-dt-params = {
 
-        # https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#enable-pcie
-        pciex1 = {
-          enable = true;
-          value = "on";
-        };
-        # PCIe Gen 3.0
-        # https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#pcie-gen-3-0
-        pciex1_gen = {
-          enable = true;
-          value = "3";
-        };
+  #       # https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#enable-pcie
+  #       pciex1 = {
+  #         enable = true;
+  #         value = "on";
+  #       };
+  #       # PCIe Gen 3.0
+  #       # https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#pcie-gen-3-0
+  #       pciex1_gen = {
+  #         enable = true;
+  #         value = "3";
+  #       };
 
-      };
+  #     };
 
-    };
-  };
+  #   };
+  # };
 }
diff --git a/systems/x86_64-linux/jallen-nas/boot.nix b/systems/x86_64-linux/jallen-nas/boot.nix
index f0a87de..5ae6953 100755
--- a/systems/x86_64-linux/jallen-nas/boot.nix
+++ b/systems/x86_64-linux/jallen-nas/boot.nix
@@ -5,7 +5,7 @@
   ...
 }:
 let
-  kernel = pkgs.linuxPackages_cachyos-server-lto-znver4;
+  kernel = pkgs.${namespace}.linuxPackages_cachyos-server-lto-znver4;
 in
 {
   # Configure bootloader with lanzaboot and secureboot
diff --git a/systems/x86_64-linux/matt-nixos/boot.nix b/systems/x86_64-linux/matt-nixos/boot.nix
index 2fc8043..a694c6b 100755
--- a/systems/x86_64-linux/matt-nixos/boot.nix
+++ b/systems/x86_64-linux/matt-nixos/boot.nix
@@ -1,6 +1,6 @@
-{ config, pkgs, ... }:
+{ config, pkgs, namespace, ... }:
 let
-  kernel = pkgs.linuxPackages_cachyos-lto-znver4;
+  kernel = pkgs.${namespace}.linuxPackages_cachyos-lto-znver4;
   pkgsVersion = pkgs; # .unstable;
 in
 {
diff --git a/systems/x86_64-linux/nuc-nixos/default.nix b/systems/x86_64-linux/nuc-nixos/default.nix
index aba9a52..8320401 100644
--- a/systems/x86_64-linux/nuc-nixos/default.nix
+++ b/systems/x86_64-linux/nuc-nixos/default.nix
@@ -101,6 +101,6 @@
   # #                     Boot                      # #
   # ###################################################
 
-  boot.kernelPackages = pkgs.linuxPackages_cachyos-server-lto-znver4;
+  boot.kernelPackages = pkgs.${namespace}.linuxPackages_cachyos-server-lto-znver4;
 
 }
diff --git a/systems/x86_64-linux/steamdeck/boot.nix b/systems/x86_64-linux/steamdeck/boot.nix
index a0a4447..edfac19 100755
--- a/systems/x86_64-linux/steamdeck/boot.nix
+++ b/systems/x86_64-linux/steamdeck/boot.nix
@@ -1,6 +1,6 @@
 { pkgs, ... }:
 let
-  kernel = pkgs.linuxPackages_cachyos-lto;
+  kernel = pkgs.${namespace}.linuxPackages_cachyos-lto;
 in
 {
   # Configure bootloader with lanzaboot and secureboot