From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 11 Feb 2022 19:51:20 +0000 (+0000)
Subject: add -nocarry option to synth_xilinx to avoid nextpnr-xilinx lock-up
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f2abbea0206595e504ab4ff0ca0c48ca28200742;p=nmigen.git

add -nocarry option to synth_xilinx to avoid nextpnr-xilinx lock-up
situation when CARRY4 chains go about 23-25
---

diff --git a/nmigen/vendor/xilinx.py b/nmigen/vendor/xilinx.py
index 7514ceb..0517ecb 100644
--- a/nmigen/vendor/xilinx.py
+++ b/nmigen/vendor/xilinx.py
@@ -480,7 +480,7 @@ class XilinxPlatform(TemplatedPlatform):
         """,
         r"""
         {{invoke_tool("yosys")}}
-            -p "synth_xilinx -flatten -abc9 -nobram -arch xc7 -top {{name}}; write_json {{name}}.json" {% for file in platform.iter_files(".v", ".sv", ".vhd", ".vhdl") -%} {{file}} {% endfor %} {{name}}.v
+            -p "synth_xilinx -flatten -nocarry -abc9 -nobram -arch xc7 -top {{name}}; write_json {{name}}.json" {% for file in platform.iter_files(".v", ".sv", ".vhd", ".vhdl") -%} {{file}} {% endfor %} {{name}}.v
         """,
         r"""
         {{invoke_tool("nextpnr-xilinx")}}