From fd7aac7b50ed3400cd296896cb82ed773004b758 Mon Sep 17 00:00:00 2001
From: Jean THOMAS <git0@pub.jeanthomas.me>
Date: Tue, 4 Aug 2020 15:27:40 +0200
Subject: [PATCH] Raise exception if no native port is present (fixing #48)

---
 gram/core/crossbar.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gram/core/crossbar.py b/gram/core/crossbar.py
index 642a8e2..ae29a12 100644
--- a/gram/core/crossbar.py
+++ b/gram/core/crossbar.py
@@ -106,7 +106,8 @@ class gramCrossbar(Elaboratable):
 
         controller = self.controller
         nmasters = len(self.masters)
-        assert nmasters > 0
+        if nmasters < 1:
+            raise ValueError("No frontend instantiated")
 
         # Address mapping --------------------------------------------------------------------------
         cba_shifts = {"ROW_BANK_COL": controller.settings.geom.colbits - controller.address_align}
-- 
2.30.2