.gitignore

@@ -16,8 +16,6 @@ verilog_RTL
 # files generated for FPGA ULX3s implementation
 ulx3s_fpga/mkTop.d
 ulx3s_fpga/mkTop.json
-ulx3s_fpga/mkTop.bit
-ulx3s_fpga/mkTop.config
 
 # generated experiment outputs
 experiments/bram/*.cxx

Makefile

@@ -159,7 +159,7 @@ v_sim_vcd:
 # ----------------------------------------------------------------
 
 fpga:
-	make -C ulx3s_fpga mkTop.bit
+	make -C ulx3s_fpga
 
 .PHONY: clean
 clean:

bs/Serializer.bs

@@ -49,3 +49,4 @@ mkSerialize fileHandle = do
           ftdiState := ftdiState' ftdiState
         when (ftdiState == IDLE)
       bitLineOut = ftdiTxOut
+    

default.nix

@@ -1,25 +0,0 @@
-{
-  system ? builtins.currentSystem,
-}:
-let
-  lock = builtins.fromJSON (builtins.readFile ./flake.lock);
-
-  root = lock.nodes.${lock.root};
-  inherit (lock.nodes.${root.inputs.flake-compat}.locked)
-    owner
-    repo
-    rev
-    narHash
-    ;
-
-  flake-compat = fetchTarball {
-    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz";
-    sha256 = narHash;
-  };
-
-  flake = import flake-compat {
-    inherit system;
-    src = ./.;
-  };
-in
-flake.defaultNix

flake.lock

@@ -1,61 +0,0 @@
-{
-  "nodes": {
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1744536153,
-        "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "18dd725c29603f582cf1900e0d25f9f1063dbf11",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs",
-        "utils": "utils"
-      }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
-    "utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}

flake.nix

@@ -1,78 +0,0 @@
-{
-  inputs = {
-    nixpkgs = {
-      url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-    };
-    utils.url = "github:numtide/flake-utils";
-  };
-
-  outputs =
-    inputs:
-    inputs.utils.lib.eachDefaultSystem (
-      system:
-      let
-        pkgs = import inputs.nixpkgs {
-          localSystem = system;
-          overlays = [
-            (final: prev: {
-
-              riscv-bluespec-classic = pkgs.callPackage (
-                {
-                  stdenv,
-                  bluespec,
-                  nextpnr,
-                  openfpgaloader,
-                  trellis,
-                  which,
-                  yosys,
-                }:
-                stdenv.mkDerivation {
-                  pname = "riscv-bluespec-classic";
-                  version = "0.1.0";
-                  src = ./.;
-
-                  # Versions can be checked with
-                  # `nix eval --json ".#riscv-bluespec-classic.nativeBuildInputs" | nix-shell -p jq --run jq`
-                  nativeBuildInputs = [
-                    bluespec
-                    nextpnr
-                    openfpgaloader
-                    trellis
-                    which
-                    yosys
-                  ];
-
-                  makeFlags = [
-                    "fpga"
-                  ];
-
-                  installPhase = ''
-                    runHook preInstall
-
-                    mkdir -p "$out"
-                    cp "./ulx3s_fpga/mkTop.bit" "$out/"
-
-                    runHook postInstall
-                  '';
-
-                }
-              ) { };
-
-            })
-          ];
-        };
-      in
-      {
-        packages = {
-          default = inputs.self.packages."${system}".riscv-bluespec-classic;
-          riscv-bluespec-classic = pkgs.riscv-bluespec-classic;
-        };
-
-        devShells.default =
-          with pkgs;
-          mkShell {
-            inputsFrom = [ riscv-bluespec-classic ];
-          };
-      }
-    );
-}

shell.nix

@@ -1,25 +1,14 @@
-{
+{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/d34a98666913267786d9ab4aa803a1fc75f81f4d.tar.gz") {} }:
-  system ? builtins.currentSystem,
-}:
-let
-  lock = builtins.fromJSON (builtins.readFile ./flake.lock);
 
-  root = lock.nodes.${lock.root};
+pkgs.mkShell {
-  inherit (lock.nodes.${root.inputs.flake-compat}.locked)
+  buildInputs = [
-    owner
+    pkgs.yosys
-    repo
+    pkgs.nextpnr
-    rev
+    pkgs.bluespec
-    narHash
+    pkgs.yosys-bluespec
-    ;
+  ];
 
-  flake-compat = fetchTarball {
+  shellHook = ''
-    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz";
+    echo "Dev environment for Manna Chip."
-    sha256 = narHash;
+  '';
-  };
+}
-
-  flake = import flake-compat {
-    inherit system;
-    src = ./.;
-  };
-in
-flake.shellNix

ulx3s_fpga/makefile

@@ -5,7 +5,7 @@ IDCODE ?= 0x41113043 # 85f
 
 all: prog
 
-../verilog_RTL/$(TOPMODULE).v: ../bs/Top.bs
+../verilog_RTL/$(TOPMODULE).v: ../src/Top.bsv
 	V_SIM=verilator TOPMODULE=$(TOPMODULE) make -C ../ v_compile
 
 $(TOPMODULE).json: ../verilog_RTL/$(TOPMODULE).v
@@ -21,7 +21,6 @@ $(TOPMODULE).config: $(TOPMODULE).json
 		--textcfg $@ \
 		--lpf ulx3s_v20.lpf \
 		--85k \
-		--lpf-allow-unconstrained \
 		--package CABGA381
 
 $(TOPMODULE).bit: $(TOPMODULE).config