diff --git a/flake.nix b/flake.nix
index 92bbdc6..fca20df 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,102 +1,19 @@
 {
-  inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
-  };
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
 
   outputs = { self, nixpkgs }:
     let
       system = "x86_64-linux";
       crossSystem = "aarch64-linux";
+
       pkgs = import nixpkgs {
         inherit system;
-
-        overlays = [
-          (self: super: {
-            systemd = super.systemd.override {
-              pname = "systemd-minimal";
-              withAcl = false;
-              withAnalyze = false;
-              withApparmor = false;
-              withAudit = false;
-              withCompression = false;
-              withCoredump = false;
-              withCryptsetup = false;
-              withDocumentation = false;
-              withEfi = false;
-              withFido2 = false;
-              withHostnamed = false;
-              withHomed = false;
-              withImportd = false;
-              withLibBPF = false;
-              withLibidn2 = false;
-              withLocaled = false;
-              withMachined = false;
-              withNetworkd = false;
-              withNss = false;
-              withOomd = false;
-              withPCRE2 = false;
-              withPolkit = false;
-              withPortabled = false;
-              withRemote = false;
-              withResolved = false;
-              withShellCompletions = false;
-              withTimedated = false;
-              withTimesyncd = false;
-              withTpm2Tss = false;
-              withUserDb = false;
-              # This is necessary for any installation
-              # withPam = false;
-              # withHwdb = false;
-              # withLogind = false;
-            };
-
-            libaom = super.libaom.override {
-              enableButteraugli = false;
-            };
-
-            pin_control = self.callPackage ./pin_control { };
-          })
-        ];
-
-        crossSystem = {
-          gcc.cpu = "cortex-a53";
-          config = "aarch64-unknown-linux-gnu";
-          linux-kernel = {
-            DTB = true;
-            autoModules = true;
-            baseConfig = "defconfig";
-
-            extraConfig = ''
-              # Raspberry Pi 3 stuff. Not needed for   s >= 4.10.
-              ARCH_BCM2835 y
-              BCM2835_MBOX y
-              BCM2835_WDT y
-              RASPBERRYPI_FIRMWARE y
-              RASPBERRYPI_POWER y
-              SERIAL_8250_BCM2835AUX y
-              SERIAL_8250_EXTENDED y
-              SERIAL_8250_SHARE_IRQ y
-
-              # Cavium ThunderX stuff.
-              PCI_HOST_THUNDER_ECAM y
-              
-              # Nvidia Tegra stuff.
-              PCI_TEGRA y
-              
-              # The default (=y) forces us to have the XHCI firmware available in initrd,
-              # which our initrd builder can't currently do easily.
-              USB_XHCI_TEGRA m
-            '';
-
-            name = "aarch64-multiplatform";
-            preferBuiltin = true;
-            target = "Image";
-          };
-        };
+        crossSystem = import ./triviOS/cross.nix;
+        overlays = [ (import ./triviOS/overlay.nix) ];
       };
     in
     {
-      packages.${crossSystem} = pkgs;
+      formatter.${system} = pkgs.pkgsBuildBuild.nixpkgs-fmt;
 
       nixosConfigurations.triviOS = nixpkgs.lib.nixosSystem {
         inherit pkgs;
@@ -104,6 +21,6 @@
         modules = [ ./triviOS ];
       };
 
-      formatter.${system} = pkgs.pkgsBuildBuild.nixpkgs-fmt;
+      packages.${crossSystem} = pkgs;
     };
 }
diff --git a/triviOS/cross.nix b/triviOS/cross.nix
new file mode 100644
index 0000000..0e95a42
--- /dev/null
+++ b/triviOS/cross.nix
@@ -0,0 +1,36 @@
+{
+  config = "aarch64-unknown-linux-gnu";
+  gcc.cpu = "cortex-a53";
+
+  linux-kernel = {
+    DTB = true;
+    autoModules = true;
+    baseConfig = "defconfig";
+
+    extraConfig = ''
+      # Raspberry Pi 3 stuff. Not needed for   s >= 4.10.
+      ARCH_BCM2835 y
+      BCM2835_MBOX y
+      BCM2835_WDT y
+      RASPBERRYPI_FIRMWARE y
+      RASPBERRYPI_POWER y
+      SERIAL_8250_BCM2835AUX y
+      SERIAL_8250_EXTENDED y
+      SERIAL_8250_SHARE_IRQ y
+
+      # Cavium ThunderX stuff.
+      PCI_HOST_THUNDER_ECAM y
+      
+      # Nvidia Tegra stuff.
+      PCI_TEGRA y
+      
+      # The default (=y) forces us to have the XHCI firmware available in initrd,
+      # which our initrd builder can't currently do easily.
+      USB_XHCI_TEGRA m
+    '';
+
+    name = "aarch64-multiplatform";
+    preferBuiltin = true;
+    target = "Image";
+  };
+}
diff --git a/triviOS/overlay.nix b/triviOS/overlay.nix
new file mode 100644
index 0000000..7f3821f
--- /dev/null
+++ b/triviOS/overlay.nix
@@ -0,0 +1,46 @@
+self: super: {
+  systemd = super.systemd.override {
+    pname = "systemd-minimal";
+    withAcl = false;
+    withAnalyze = false;
+    withApparmor = false;
+    withAudit = false;
+    withCompression = false;
+    withCoredump = false;
+    withCryptsetup = false;
+    withDocumentation = false;
+    withEfi = false;
+    withFido2 = false;
+    withHostnamed = false;
+    withHomed = false;
+    withImportd = false;
+    withLibBPF = false;
+    withLibidn2 = false;
+    withLocaled = false;
+    withMachined = false;
+    withNetworkd = false;
+    withNss = false;
+    withOomd = false;
+    withPCRE2 = false;
+    withPolkit = false;
+    withPortabled = false;
+    withRemote = false;
+    withResolved = false;
+    withShellCompletions = false;
+    withTimedated = false;
+    withTimesyncd = false;
+    withTpm2Tss = false;
+    withUserDb = false;
+
+    # Se implican y son necesarios:
+    # withPam = true;
+    # withHwdb = true;
+    # withLogind = true;
+  };
+
+  libaom = super.libaom.override {
+    enableButteraugli = false;
+  };
+
+  pin_control = self.callPackage ../pin_control { };
+}