From f324f9531af311853d83eb4700af0e08e440e75f Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 1 Feb 2021 13:08:37 +0100
Subject: [PATCH] build/gowin: Don't generate IO_LOC is pin name is X.

---
 litex/build/gowin/gowin.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/litex/build/gowin/gowin.py b/litex/build/gowin/gowin.py
index 337d2ab93..1b218d2fe 100644
--- a/litex/build/gowin/gowin.py
+++ b/litex/build/gowin/gowin.py
@@ -26,7 +26,8 @@ def _build_cst(named_sc, named_pc):
             flat_sc.append((name, pins[0], other))
 
     for name, pin, other in flat_sc:
-        lines.append(f"IO_LOC \"{name}\" {pin};")
+        if pin != "X":
+            lines.append(f"IO_LOC \"{name}\" {pin};")
 
         for c in other:
             if isinstance(c, IOStandard):