From 8fa3088057633a431c342fb03d650ca06a92fb35 Mon Sep 17 00:00:00 2001
From: gatecat <gatecat@ds0.me>
Date: Mon, 7 Jun 2021 21:20:40 +0100
Subject: ecp5: Don't attempt to promote undriven nets to globals

Signed-off-by: gatecat <gatecat@ds0.me>
---
 ecp5/globals.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ecp5/globals.cc b/ecp5/globals.cc
index b840ac91..ee30fcec 100644
--- a/ecp5/globals.cc
+++ b/ecp5/globals.cc
@@ -75,7 +75,8 @@ class Ecp5GlobalRouter
         dict<IdString, int> clockCount;
         for (auto &net : ctx->nets) {
             NetInfo *ni = net.second.get();
-            if (ni->name == ctx->id("$PACKER_GND_NET") || ni->name == ctx->id("$PACKER_VCC_NET"))
+            if (ni->name == ctx->id("$PACKER_GND_NET") || ni->name == ctx->id("$PACKER_VCC_NET") ||
+                ni->driver.cell == nullptr)
                 continue;
             clockCount[ni->name] = 0;
             for (const auto &user : ni->users) {
-- 
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