cpu/microwatt/add_sources: add use_ghdl_yosys_synth parameter to convert microwatt to verilog using GHDL-Yosys-plugin and use converted verilog for build.

litex/soc/cores/cpu/microwatt/core.py

@@ -39,6 +39,7 @@ class Microwatt(CPU):
         flags += "-mno-altivec "
         flags += "-mlittle-endian "
         flags += "-mstrict-align "
+        flags += "-fno-stack-protector "
         flags += "-D__microwatt__ "
         return flags
 
@@ -101,9 +102,8 @@ class Microwatt(CPU):
         assert reset_address == 0x00000000
 
     @staticmethod
-    def add_sources(platform):
-        sdir = get_data_mod("cpu", "microwatt").data_location
-        platform.add_sources(sdir,
+    def add_sources(platform, use_ghdl_yosys_plugin=False):
+        sources = [
             # Common / Types / Helpers
             "decode_types.vhdl",
             "wishbone_types.vhdl",
@@ -154,8 +154,27 @@ class Microwatt(CPU):
             # Core
             "core_debug.vhdl",
             "core.vhdl",
-        )
-        platform.add_source(os.path.join(os.path.dirname(__file__), "microwatt_wrapper.vhdl"))
+        ]
+        sdir = get_data_mod("cpu", "microwatt").data_location
+        cdir = os.path.dirname(__file__)
+        if use_ghdl_yosys_plugin:
+            from litex.build import tools
+            import subprocess
+            ys = []
+            ys.append("ghdl --ieee=synopsys -fexplicit -frelaxed-rules --std=08 \\")
+            for source in sources:
+                ys.append(os.path.join(sdir, source) + " \\")
+            ys.append(os.path.join(os.path.dirname(__file__), "microwatt_wrapper.vhdl") + " \\")
+            ys.append("-e microwatt_wrapper")
+            ys.append("chformal -assert -remove")
+            ys.append("write_verilog {}".format(os.path.join(cdir, "microwatt.v")))
+            tools.write_to_file(os.path.join(cdir, "microwatt.ys"), "\n".join(ys))
+            if subprocess.call(["yosys", "-q", "-m", "ghdl", os.path.join(cdir, "microwatt.ys")]):
+                raise OSError("Unable to convert Microwatt CPU to verilog, please check your GHDL-Yosys-plugin install")
+            platform.add_source(os.path.join(cdir, "microwatt.v"))
+        else:
+            platform.add_sources(sdir, *sources)
+            platform.add_source(os.path.join(os.path.dirname(__file__), "microwatt_wrapper.vhdl"))
 
     def do_finalize(self):
         self.specials += Instance("microwatt_wrapper", **self.cpu_params)