Setup amaranth tools to use our yowasp build

Author: robtaylor

chipflow_lib/steps/__init__.py

@@ -2,8 +2,30 @@
 Steps provide an extensible way to modify the `chipflow` command behavior for a given design
 """
 
+import os
 from abc import ABC
 
+def _setup_amaranth_tools():
+    _amaranth_settings = {
+        "AMARANTH_USE_YOSYS": "system",
+        "YOSYS": "yowasp-yosys",
+        "SBY": "yowasp-sby",
+        "SMTBMC": "yowasp-yosys-smtbmc",
+        "NEXTPNR_ICE40": "yowasp-nextpnr-ice40",
+        "ICEPACK": "yowasp-icepackr",
+        "NEXTPNR_ECP5": "yowasp-nextpnr-ecp5",
+        "ECPBRAM": "yowasp-ecpbram",
+        "ECPMULTI": "yowasp-ecpmulti",
+        "ECPPACK": "yowasp-ecppack",
+        "ECPPLL": "yowasp-ecppll",
+        "ECPUNPACK": "yowasp-ecpunpack",
+        "NEXTPNR-ECP5": "yowasp-nextpnr-ecp5",
+        "SBY": "yowasp-sby",
+        "YOSYS-WITNESS": "yowasp-yosys-witness",
+    }
+
+    os.environ |= _amaranth_settings
+
 class StepBase(ABC):
     def __init__(self, config={}):
         ...

chipflow_lib/steps/board.py

@@ -6,6 +6,7 @@ class BoardStep(StepBase):
 
     def __init__(self, config, platform):
         self.platform = platform
+        _setup_amaranth_tools()
 
     def build_cli_parser(self, parser):
         pass