diff --git a/flake.lock b/flake.lock
index 6294073..d493fdd 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1712791164,
-        "narHash": "sha256-3sbWO1mbpWsLepZGbWaMovSO7ndZeFqDSdX0hZ9nVyw=",
+        "lastModified": 1738680400,
+        "narHash": "sha256-ooLh+XW8jfa+91F1nhf9OF7qhuA/y1ChLx6lXDNeY5U=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "1042fd8b148a9105f3c0aca3a6177fd1d9360ba5",
+        "rev": "799ba5bffed04ced7067a91798353d360788b30d",
         "type": "github"
       },
       "original": {
@@ -16,9 +16,44 @@
         "type": "github"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1735554305,
+        "narHash": "sha256-zExSA1i/b+1NMRhGGLtNfFGXgLtgo+dcuzHzaWA6w3Q=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "0e82ab234249d8eee3e8c91437802b32c74bb3fd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "treefmt-nix": "treefmt-nix"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1738680491,
+        "narHash": "sha256-8X7tR3kFGkE7WEF5EXVkt4apgaN85oHZdoTGutCFs6I=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "64dbb922d51a42c0ced6a7668ca008dded61c483",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index bf6c3da..00b4ce5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,48 +3,84 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    treefmt-nix.url = "github:numtide/treefmt-nix";
   };
 
-  outputs = inputs@{ nixpkgs, ... }:
+  outputs =
+    inputs@{
+      self,
+      nixpkgs,
+      treefmt-nix,
+      ...
+    }:
     let
-      # litex-overlay = final: prev: {
-      #   pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
-      #     (python-final: python-prev: {
-      #       litex = python-final.callPackage (import ./litex.nix) { };
-      #       # can add more packages here!
-      #     })
-      #   ];
-      # };
-      litex-overlay = import ./litex;
-      systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
-      forAllSystems = function:
-        nixpkgs.lib.genAttrs systems (system: function (
-          import nixpkgs {
-            inherit system;
-            config.allowUnfree = true;
-            overlays = [
-              litex-overlay
-            ]; # patches, version pins, new pkgs here.
-          }
-        ));
-    in {
+
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "aarch64-darwin"
+        "x86_64-darwin"
+      ];
+      forAllSystems =
+        function:
+        nixpkgs.lib.genAttrs systems (
+          system:
+          function (
+            import nixpkgs {
+              inherit system;
+              config.allowUnfree = true;
+              overlays = [
+                self.overlays.default
+              ];
+            }
+          )
+        );
+      litex-pkgs = import ./pkgs;
+
+      treefmtEval = forAllSystems (pkgs: treefmt-nix.lib.evalModule pkgs ./treefmt.nix);
+    in
+    {
+      overlays.default = final: prev: {
+        pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
+          (
+            python-final: python-prev:
+            builtins.mapAttrs (name: value: python-final.callPackage value { }) litex-pkgs
+          )
+        ];
+      };
+
+      formatter = forAllSystems (pkgs: treefmtEval.${pkgs.system}.config.build.wrapper);
+
+      checks = forAllSystems (pkgs: {
+        formatting = treefmtEval.${pkgs.system}.config.build.check self;
+      });
+
+      # this is mainly so that nix-update works. I have no idea if this works without it.
+      # use at your own peril.
+      packages = forAllSystems (
+        pkgs: builtins.mapAttrs (name: value: pkgs.python3Packages.callPackage value { }) litex-pkgs
+      );
+
+      # example, not really something you should import unless you want everything.
       devShells = forAllSystems (pkgs: {
         default = pkgs.mkShell {
           packages = with pkgs; [
-            (python3.withPackages (ps: with ps; [ 
-              cocotb
-              cocotb-bus
-              litex
-              litedram
-              liteeth
-              litescope
-              litespi
-              liteiclink
-              pythondata-cpu-vexriscv
-              pythondata-software-compiler_rt
-              pythondata-software-picolibc
-              amaranth
-            ]))
+            (python3.withPackages (
+              ps: with ps; [
+                cocotb
+                cocotb-bus
+                litex
+                litedram
+                liteeth
+                litescope
+                litespi
+                liteiclink
+                pythondata-cpu-vexriscv
+                pythondata-software-compiler_rt
+                pythondata-software-picolibc
+                amaranth
+              ]
+            ))
             yosys
             nextpnr
             # simulators
@@ -58,5 +94,5 @@
           ];
         };
       });
-  };
+    };
 }
diff --git a/litex/default.nix b/litex/default.nix
deleted file mode 100644
index 3e9ed12..0000000
--- a/litex/default.nix
+++ /dev/null
@@ -1,19 +0,0 @@
-# an overlay to 
-let 
-  tag = "2023.12";
-in final: prev: {
-  pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
-    (python-final: python-prev: {
-      litex = python-final.callPackage(import ./litex.nix tag) { };
-      litedram = python-final.callPackage(import ./litedram.nix tag) { };
-      liteeth = python-final.callPackage(import ./liteeth.nix tag) { };
-      litescope = python-final.callPackage(import ./litescope.nix tag) { };
-      litespi = python-final.callPackage(import ./litespi.nix tag) { };
-      liteiclink = python-final.callPackage(import ./liteiclink.nix tag) { };
-      pythondata-cpu-vexriscv = python-final.callPackage(import ./pythondata-cpu-vexriscv.nix tag) { };
-      pythondata-software-compiler_rt = python-final.callPackage(import ./pythondata-software-compiler_rt.nix tag) { };
-      pythondata-software-picolibc = python-final.callPackage(import ./pythondata-software-picolibc.nix tag) { };
-    })
-  ];
-}
-
diff --git a/pkgs/default.nix b/pkgs/default.nix
new file mode 100644
index 0000000..8a6d0da
--- /dev/null
+++ b/pkgs/default.nix
@@ -0,0 +1,11 @@
+{
+  litex = import ./litex.nix;
+  litedram = import ./litedram.nix;
+  liteeth = import ./liteeth.nix;
+  litescope = import ./litescope.nix;
+  litespi = import ./litespi.nix;
+  liteiclink = import ./liteiclink.nix;
+  pythondata-cpu-vexriscv = import ./pythondata-cpu-vexriscv.nix;
+  pythondata-software-compiler_rt = import ./pythondata-software-compiler_rt.nix;
+  pythondata-software-picolibc = import ./pythondata-software-picolibc.nix;
+}
diff --git a/litex/litedram.nix b/pkgs/litedram.nix
similarity index 68%
rename from litex/litedram.nix
rename to pkgs/litedram.nix
index 7eb6c18..7a09061 100644
--- a/litex/litedram.nix
+++ b/pkgs/litedram.nix
@@ -1,17 +1,18 @@
-tag: {
-  pkgs 
-, lib
-, buildPythonPackage 
-, migen
-, pyyaml
-}: buildPythonPackage {
+{
+  pkgs,
+  lib,
+  buildPythonPackage,
+  migen,
+  pyyaml,
+}:
+buildPythonPackage rec {
   pname = "litedram";
-  version = "${tag}";
+  version = "2023.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "enjoy-digital";
     repo = "litedram";
-    rev = "${tag}";
+    rev = "${version}";
     hash = "sha256-EaUszy0v6r5sKM5d5YmpRbR8Cf9xITObU71zUpg9cLU=";
   };
 
diff --git a/litex/liteeth.nix b/pkgs/liteeth.nix
similarity index 57%
rename from litex/liteeth.nix
rename to pkgs/liteeth.nix
index dfb1f43..84ef19f 100644
--- a/litex/liteeth.nix
+++ b/pkgs/liteeth.nix
@@ -1,20 +1,21 @@
-tag: {
-  pkgs 
-, lib
-, buildPythonPackage 
-, migen
-, setuptools
-, litex
-, pyyaml
-}: buildPythonPackage {
+{
+  pkgs,
+  lib,
+  buildPythonPackage,
+  migen,
+  setuptools,
+  litex,
+  pyyaml,
+}:
+buildPythonPackage rec {
   pname = "liteeth";
-  version = "${tag}";
+  version = "2024.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "enjoy-digital";
     repo = "liteeth";
-    rev = "${tag}";
-    hash = "sha256-DUNwDzcFLVmL5F/ZWmok7T7jO7ixC9IuDr1WUarnAqk=";
+    rev = "${version}";
+    hash = "sha256-qyyw/NEI21o+lkm8q9vT7O9PLkTgObe/xZKeFvy/4/4=";
   };
 
   buildInputs = [
diff --git a/litex/liteiclink.nix b/pkgs/liteiclink.nix
similarity index 71%
rename from litex/liteiclink.nix
rename to pkgs/liteiclink.nix
index f6a32b7..eba1182 100644
--- a/litex/liteiclink.nix
+++ b/pkgs/liteiclink.nix
@@ -1,15 +1,16 @@
-tag: {
-  pkgs 
-, buildPythonPackage 
-, litex
-}: buildPythonPackage {
+{
+  pkgs,
+  buildPythonPackage,
+  litex,
+}:
+buildPythonPackage rec {
   pname = "liteiclink";
-  version = "${tag}";
+  version = "2023.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "enjoy-digital";
     repo = "liteiclink";
-    rev = "${tag}";
+    rev = "${version}";
     hash = "sha256-5Hp5vFqmfkXo1q60FvOkToTy952svirChIPIvkam04M=";
   };
 
diff --git a/litex/litescope.nix b/pkgs/litescope.nix
similarity index 66%
rename from litex/litescope.nix
rename to pkgs/litescope.nix
index a731763..3bf9121 100644
--- a/litex/litescope.nix
+++ b/pkgs/litescope.nix
@@ -1,18 +1,19 @@
-tag: {
-  pkgs 
-, lib
-, buildPythonPackage 
-, migen
-, setuptools
-, litex
-}: buildPythonPackage {
+{
+  pkgs,
+  lib,
+  buildPythonPackage,
+  migen,
+  setuptools,
+  litex,
+}:
+buildPythonPackage rec {
   pname = "litescope";
-  version = "${tag}";
+  version = "2023.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "enjoy-digital";
     repo = "litescope";
-    rev = "${tag}";
+    rev = "${version}";
     hash = "sha256-OWC+XwB+BzlCQkPKJCbQ0W4T6JbsInldrn9jYYjWypM=";
   };
 
diff --git a/litex/litespi.nix b/pkgs/litespi.nix
similarity index 70%
rename from litex/litespi.nix
rename to pkgs/litespi.nix
index 9437817..72b6e01 100644
--- a/litex/litespi.nix
+++ b/pkgs/litespi.nix
@@ -1,18 +1,19 @@
-tag: {
-  pkgs 
-, lib
-, buildPythonPackage 
-, migen
-, setuptools
-, litex
-}: buildPythonPackage {
+{
+  pkgs,
+  lib,
+  buildPythonPackage,
+  migen,
+  setuptools,
+  litex,
+}:
+buildPythonPackage rec {
   pname = "litespi";
-  version = "${tag}";
+  version = "2023.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "litex-hub";
     repo = "litespi";
-    rev = "${tag}";
+    rev = "${version}";
     hash = "sha256-XYeWokF1IGtZWRK+6jhRSN91MOV5vyh5aO08sbtFBxw=";
   };
 
diff --git a/litex/litex.nix b/pkgs/litex.nix
similarity index 50%
rename from litex/litex.nix
rename to pkgs/litex.nix
index 15255a5..19b84ad 100644
--- a/litex/litex.nix
+++ b/pkgs/litex.nix
@@ -1,21 +1,22 @@
-tag: {
-  pkgs 
-, lib
-, buildPythonPackage 
-, pyserial
-, migen
-, requests
-, packaging
-, pexpect
-}: buildPythonPackage {
+{
+  pkgs,
+  lib,
+  buildPythonPackage,
+  pyserial,
+  migen,
+  requests,
+  packaging,
+  pexpect,
+}:
+buildPythonPackage rec {
   pname = "litex";
-  version = "${tag}";
+  version = "2024.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "enjoy-digital";
     repo = "litex";
-    rev = "${tag}";
-    hash = "sha256-OcwqYLQ7ec2vTewdIJqP/aTCJ4yI43OIOkTMD/hIKO0=";
+    rev = "${version}";
+    hash = "sha256-T28kpdDstMHZtSlRrmA1JZ3lP2/3tfzEh58tU44ik7E=";
   };
 
   buildInputs = [
diff --git a/litex/pythondata-cpu-vexriscv.nix b/pkgs/pythondata-cpu-vexriscv.nix
similarity index 67%
rename from litex/pythondata-cpu-vexriscv.nix
rename to pkgs/pythondata-cpu-vexriscv.nix
index 4f93207..72882ad 100644
--- a/litex/pythondata-cpu-vexriscv.nix
+++ b/pkgs/pythondata-cpu-vexriscv.nix
@@ -1,14 +1,15 @@
-tag: {
-  pkgs 
-, buildPythonPackage 
-}: buildPythonPackage rec {
+{
+  pkgs,
+  buildPythonPackage,
+}:
+buildPythonPackage rec {
   pname = "pythondata-cpu-vexriscv";
-  version = "${tag}";
+  version = "2023.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "litex-hub";
     repo = "pythondata-cpu-vexriscv";
-    rev = "${tag}";
+    rev = "${version}";
     hash = "sha256-1RgwJCYxtiP5dfRHulfTNBgu6fum6RfoqkbFIlRTgKI=";
   };
 
diff --git a/litex/pythondata-software-compiler_rt.nix b/pkgs/pythondata-software-compiler_rt.nix
similarity index 69%
rename from litex/pythondata-software-compiler_rt.nix
rename to pkgs/pythondata-software-compiler_rt.nix
index 9629e9e..5f36c1b 100644
--- a/litex/pythondata-software-compiler_rt.nix
+++ b/pkgs/pythondata-software-compiler_rt.nix
@@ -1,14 +1,15 @@
-tag: {
-  pkgs 
-, buildPythonPackage 
-}: buildPythonPackage rec {
+{
+  pkgs,
+  buildPythonPackage,
+}:
+buildPythonPackage rec {
   pname = "pythondata-software-compiler_rt";
-  version = "${tag}";
+  version = "2023.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "litex-hub";
     repo = "pythondata-software-compiler_rt";
-    rev = "${tag}";
+    rev = "${version}";
     hash = "sha256-s/tfxhPwYAnu1z1LxEimeYWjX6IHbF2uD/1HjvQn/xo=";
   };
 
diff --git a/litex/pythondata-software-picolibc.nix b/pkgs/pythondata-software-picolibc.nix
similarity index 68%
rename from litex/pythondata-software-picolibc.nix
rename to pkgs/pythondata-software-picolibc.nix
index 770b110..7c5475f 100644
--- a/litex/pythondata-software-picolibc.nix
+++ b/pkgs/pythondata-software-picolibc.nix
@@ -1,14 +1,15 @@
-tag: {
-  pkgs 
-, buildPythonPackage 
-}: buildPythonPackage rec {
+{
+  pkgs,
+  buildPythonPackage,
+}:
+buildPythonPackage rec {
   pname = "pythondata-software-picolibc";
-  version = "${tag}";
+  version = "2023.12";
 
   src = pkgs.fetchFromGitHub {
     owner = "litex-hub";
     repo = "pythondata-software-picolibc";
-    rev = "${tag}";
+    rev = "${version}";
     hash = "sha256-5OY17BA37c6aHOvUwb0gJwXxGey4TdUiTTxJD5wuSGU=";
   };
 
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..e69de29
diff --git a/Makefile b/templates/default/Makefile
similarity index 100%
rename from Makefile
rename to templates/default/Makefile
diff --git a/README.md b/templates/default/README.md
similarity index 100%
rename from README.md
rename to templates/default/README.md
diff --git a/templates/default/flake.nix b/templates/default/flake.nix
new file mode 100644
index 0000000..dc09248
--- /dev/null
+++ b/templates/default/flake.nix
@@ -0,0 +1,75 @@
+{
+  description = "ECP5 toolchain template project";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    inputs@{ nixpkgs, ... }:
+    let
+      # litex-overlay = final: prev: {
+      #   pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
+      #     (python-final: python-prev: {
+      #       litex = python-final.callPackage (import ./litex.nix) { };
+      #       # can add more packages here!
+      #     })
+      #   ];
+      # };
+      litex-overlay = import ./litex;
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "aarch64-darwin"
+        "x86_64-darwin"
+      ];
+      forAllSystems =
+        function:
+        nixpkgs.lib.genAttrs systems (
+          system:
+          function (
+            import nixpkgs {
+              inherit system;
+              config.allowUnfree = true;
+              overlays = [
+                litex-overlay
+              ]; # patches, version pins, new pkgs here.
+            }
+          )
+        );
+    in
+    {
+      devShells = forAllSystems (pkgs: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+            (python3.withPackages (
+              ps: with ps; [
+                cocotb
+                cocotb-bus
+                litex
+                litedram
+                liteeth
+                litescope
+                litespi
+                liteiclink
+                pythondata-cpu-vexriscv
+                pythondata-software-compiler_rt
+                pythondata-software-picolibc
+                amaranth
+              ]
+            ))
+            yosys
+            nextpnr
+            # simulators
+            verilog
+            verilator
+            # support package
+            trellis
+            # loader
+            openfpgaloader
+            ecpdap # easier to poke probes.
+          ];
+        };
+      });
+    };
+}
diff --git a/src/blink.lpf b/templates/default/src/blink.lpf
similarity index 100%
rename from src/blink.lpf
rename to templates/default/src/blink.lpf
diff --git a/src/blink.v b/templates/default/src/blink.v
similarity index 100%
rename from src/blink.v
rename to templates/default/src/blink.v
diff --git a/treefmt.nix b/treefmt.nix
new file mode 100644
index 0000000..9412918
--- /dev/null
+++ b/treefmt.nix
@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+{
+  # Used to find the project root
+  projectRootFile = "flake.nix";
+  programs.nixfmt.enable = true;
+}