hardware.assembly: use --no-promote-globals on iCE40.

See #1203. This is a temporary solution in lieu of something better

Author: whitequark

software/glasgow/hardware/assembly.py

@@ -8,6 +8,7 @@
 from amaranth import *
 from amaranth.hdl import ShapeCastable
 from amaranth.lib import wiring, io
+from amaranth.vendor import SiliconBluePlatform
 from amaranth.build import ResourceError
 
 from ..support import logging
@@ -718,6 +719,13 @@ def artifact(self):
         except ResourceError:
             pass
 
+        match self._platform:
+            case SiliconBluePlatform():
+                # https://github.com/GlasgowEmbedded/glasgow/issues/1203
+                nextpnr_opts = "--placer heap --no-promote-globals"
+            case _:
+                nextpnr_opts = "--placer heap"
+
         build_plan = self._platform.prepare(m,
             # always emit complete build log to stdout; whether it's displayed is controlled by
             # the usual logging options, e.g. `-vv` or `-v -F build`
@@ -728,7 +736,7 @@ def artifact(self):
             # latest yosys and nextpnr versions default to this configuration, but we support some
             # older ones in case yowasp isn't available and this keeps the configuration consistent
             synth_opts="-abc9",
-            nextpnr_opts="--placer heap",
+            nextpnr_opts=nextpnr_opts,
         )
         toolchain = find_toolchain(tools=self._platform.required_tools)
         assert toolchain is not None

software/pdm.min.lock

@@ -5,7 +5,7 @@
 groups = ["default", "builtin-toolchain", "http", "numpy"]
 strategy = ["direct_minimal_versions"]
 lock_version = "4.5.0"
-content_hash = "sha256:dad3ecd0a3113f0339dee319e5d78b6104b5b7f45c737d0e335399ff2c00d123"
+content_hash = "sha256:ad5af09833520279930b18a10d39185388918a14d49eb8ccb8e8dad781454300"
 
 [[metadata.targets]]
 requires_python = "~=3.13"

software/pyproject.toml

@@ -70,7 +70,7 @@ builtin-toolchain = [
   # the lowest that has features transitively required by Glasgow.
   "yowasp-runtime>=1.42",
   # Most versions of Yosys and nextpnr work; the minimum versions listed here are known good.
-  "yowasp-yosys>=0.31.0.13,!=0.54.*,!=0.55.*,!=0.56.*,!=0.64.*,!=0.67.*",
+  "yowasp-yosys>=0.31.0.13,!=0.54.*,!=0.55.*,!=0.56.*,!=0.64.*",
   "yowasp-nextpnr-ice40>=0.1",
   "yowasp-nextpnr-ecp5>=0.1",
 ]