From 3da470048a43ffb1175680f3673e41acded0e582 Mon Sep 17 00:00:00 2001
From: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Date: Sun, 1 Sep 2024 09:53:24 +0200
Subject: [PATCH] build/gowin/apicula: append _synth_opts with specific
 requirements according to FPGA model

---
 litex/build/gowin/apicula.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/litex/build/gowin/apicula.py b/litex/build/gowin/apicula.py
index 7b631ba52..364e4771d 100644
--- a/litex/build/gowin/apicula.py
+++ b/litex/build/gowin/apicula.py
@@ -40,6 +40,10 @@ class GowinApiculaToolchain(YosysNextPNRToolchain):
         elif devicename == "GW2AR-18":
             devicename = "GW2A-18"
 
+        # yosys doesn't know that some variant doesn't have lutram so we tell it
+        if devicename in ["GW1NS-4"]:
+            self._synth_opts += " -nolutram"
+
         pnr_opts = "--write {top}_routed.json --top {top} --device {device}" + \
             " --vopt family={devicename} --vopt cst={top}.cst"
         self._pnr_opts += pnr_opts.format(