start working on making flake work

flake.lock

@@ -1,5 +1,22 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1726560853,
+        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
+        "type": "github"
+      },
+      "original": {
+        "id": "flake-utils",
+        "type": "indirect"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1723637854,
@@ -18,8 +35,24 @@
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -5,17 +5,9 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
   };
 
-  outputs = inputs@{ nixpkgs, ... }:
+  outputs = inputs@{ nixpkgs, flake-utils, ... }:
     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;
+		python-overlay = import ./python.nix;
       systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
       forAllSystems = function:
         nixpkgs.lib.genAttrs systems (system: function (
@@ -23,38 +15,31 @@
             inherit system;
             config.allowUnfree = true;
             overlays = [
-            ]; # patches, version pins, new pkgs here.
+				python-overlay
+            ]; 
           }
         ));
     in {
       packages = forAllSystems (pkgs: {
         sim = import ./sim/package.nix pkgs;
+
       });
       devShells = forAllSystems (pkgs: {
         default = pkgs.mkShell {
           packages = with pkgs; [
             (python3.withPackages (ps: with ps; [ 
-              cocotb
               amaranth
             ]))
             yosys
             nextpnr
-            pkgsCross.riscv64.buildPackages.gcc
-            gnumake
-            wishbone-tool
             # simulators
-            verilog
+            iverilog
             verilator
             # support package
             trellis
             # loader
             openfpgaloader
             ecpdap # easier to poke probes.
-
-            # for building the simulator
-            cmake
-            ninja
-            mdbook
           ];
         };
       });

pdm.lock

@@ -5,7 +5,7 @@
 groups = ["default", "dev"]
 strategy = ["inherit_metadata"]
 lock_version = "4.5.0"
-content_hash = "sha256:00a75da930aaa4d4233631525c1b6bb3c9642e99065be33cf83e74d4ad611d08"
+content_hash = "sha256:fbfe1db54d73aa2641413610d5e62d87b02de247293e2af3cd53ee0c283318db"
 
 [[metadata.targets]]
 requires_python = "==3.12.*"
@@ -29,11 +29,14 @@ files = [
 
 [[package]]
 name = "amaranth-boards"
-version = "0"
-summary = "Placeholder package name reserved for Amaranth HDL"
+version = "0.1.dev250"
+requires_python = "~=3.8"
+git = "https://github.com/amaranth-lang/amaranth-boards.git"
+revision = "19b97324ecf9111c5d16377af79f82aad761c476"
+summary = "Board and connector definitions for Amaranth HDL"
 groups = ["default"]
-files = [
-    {file = "amaranth_boards-0-py3-none-any.whl", hash = "sha256:0cc6af682122197b532eef7c2d378a59905ac5e63ec5c69b9147b1e05bf2c600"},
+dependencies = [
+    "amaranth<0.7,>=0.4",
 ]
 
 [[package]]

pyproject.toml

@@ -7,7 +7,7 @@ authors = [
 ]
 dependencies = [
     "amaranth>=0.5.1",
-    "amaranth-boards>=0",
+    "amaranth-boards @ git+https://github.com/amaranth-lang/amaranth-boards.git",
 ]
 requires-python = "==3.12.*"
 readme = "README.md"

python.nix

@@ -0,0 +1,18 @@
+# overlay python patched version with amaranth/boards updated.
+final: prev: {
+	python3 = prev.python3.override {
+		packageOverrides = pyfinal: pyprev: {
+		amaranth = pyprev.amaranth.overridePythonAttrs {
+			version = "0.6.0.dev53";
+			src = prev.pkgs.fetchFromGitHub {
+				owner = "amaranth-lang";
+				repo = "amaranth";
+				rev = "e30d822a7d93ee615e70e95a9958051dcc794802";
+				hash = "sha256-A46CMWGvqUFTp3geFFccUM9M7iECmNndzWm2GxA8XbE";
+			};
+			doCheck = false;
+			# installCheckPhase = "${prev.python3.interpreter} -m unittest discover -t . -s tests -v";
+		};
+		};
+	};
+}

src/groovylight/platforms/colorlight_5a75b_v8_2.py

@@ -2,7 +2,7 @@ import os
 import subprocess
 from amaranth.vendor import LatticeECP5Platform
 from amaranth.build import Resource, Pins, Attrs, Clock, Subsignal, PinsN, Connector
-from amaranth_boards.resources import SDRAMResource
+from amaranth_boards.resources import SDRAMResource, LEDResources, ButtonResources
 
 
 class Colorlight_5A75B_R82Platform(LatticeECP5Platform):
@@ -23,8 +23,10 @@ class Colorlight_5A75B_R82Platform(LatticeECP5Platform):
             Subsignal("copi", Pins("T8", dir="o")),
             Attrs(IO_TYPE="LVCMOS33"),
         ),
-        Resource("usr_btn", 0, Pins("R7", dir="i"), Attrs(IO_TYPE="LVCMOS33")),
-        Resource("usr_led", 0, Pins("T6", dir="o"), Attrs(IO_TYPE="LVCMOS33")),
+        *LEDResources(pins="T6", invert=True, attrs=Attrs(IO_TYPE="LVCMOS33", DRIVE="4")),
+        *ButtonResources(
+            pins="R7", invert=True, attrs=Attrs(IO_TYPE="LVCMOS33", PULLMODE="UP")
+        ),
         SDRAMResource(
             0,
             clk="C8",

tests/test_platform.py

@@ -0,0 +1,26 @@
+from amaranth import Elaboratable, Module, Signal
+from amaranth.lib.io import Buffer
+from groovylight.platforms.colorlight_5a75b_v8_2 import Colorlight_5A75B_R82Platform
+
+
+class Blinky(Elaboratable):
+    def elaborate(self, platform):
+        m = Module()
+
+        m.submodules.led = led = Buffer("o", platform.request("led", dir="-"))
+        state = Signal()
+        counter = Signal(24)
+
+        with m.If(counter == 0):
+            m.d.sync += [counter.eq(~0), state.eq(~state)]
+        with m.Else():
+            m.d.sync += counter.eq(counter - 1)
+
+        m.d.comb += led.o.eq(state)
+
+        return m
+
+
+def test_platform():
+    plat = Colorlight_5A75B_R82Platform()
+    plat.build(Blinky())