gateware.platform: add support for using yowasp when yosys is not ava…

…ilable

luna/__init__.py

@@ -12,6 +12,8 @@
 from amaranth           import Elaboratable
 from amaranth._unused   import MustUse
 
+from luna.gateware.platform import configure_toolchain
+
 # Log formatting strings.
 LOG_FORMAT_COLOR = "\u001b[37;1m%(levelname)-8s| \u001b[0m\u001b[1m%(module)-12s|\u001b[0m %(message)s"
 LOG_FORMAT_PLAIN = "%(levelname)-8s:n%(module)-12s>%(message)s"
@@ -108,8 +110,15 @@ def top_level_cli(fragment, *pos_args, **kwargs):
         join_text = "and uploading gateware to attached" if args.upload else "for"
         logging.info(f"Building {join_text} {platform.name}...")
 
+        # Configure toolchain.
+        if not configure_toolchain(platform):
+            logging.info(f"Failed to configure the toolchain for: {platform.toolchain}")
+            logging.info(f"Continuing anyway.")
+
         # Now that we're actually building, re-enable Unused warnings.
         MustUse._MustUse__silence = False
+
+        # Perform the build.
         products = platform.build(fragment,
             do_program=args.upload,
             build_dir=build_dir

luna/gateware/platform/__init__.py

@@ -16,6 +16,7 @@
 from amaranth import Record
 
 from .core import NullPin, LUNAPlatform
+from .toolchain import configure_toolchain
 
 
 def _get_platform_from_string(platform):
@@ -63,11 +64,11 @@ def get_appropriate_platform() -> LUNAPlatform:
             "Unable to autodetect a supported platform. "
             "The LUNA_PLATFORM environment variable must be set.")
     platform = _get_platform_from_string(platform_string)
-    
+
     # If possible, override the platform's device type with the detected FPGA.
     if fpga_device is not None:
         platform.device = fpga_device
-    
+
     return platform