allow yosys version 0.9

diff --git a/nmigen/back/verilog.py b/nmigen/back/verilog.py
index b9c32d616eda13568d106ee4dad50328217674b7..0fa338e17c94599c7c5b5fb7059806258a814de6 100644 (file)
--- a/nmigen/back/verilog.py
+++ b/nmigen/back/verilog.py
@@ -7,7 +7,7 @@ __all__ = ["YosysError", "convert", "convert_fragment"]
 
 def _convert_rtlil_text(rtlil_text, *, strip_internal_attrs=False, write_verilog_opts=()):
     # this version requirement needs to be synchronized with the one in setup.py!
-    yosys = find_yosys(lambda ver: ver >= (0, 10))
+    yosys = find_yosys(lambda ver: ver >= (0, 9))
     yosys_version = yosys.version()
 
     script = []