From a947f09bfbc4d7a87c74a6df4b72c0fa7fbfffe9 Mon Sep 17 00:00:00 2001
From: Arnaud Durand <arnaud.durand@unifr.ch>
Date: Thu, 22 Aug 2019 00:43:03 +0200
Subject: Restrict clock promotion to global

---
 ecp5/globals.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ecp5/globals.cc b/ecp5/globals.cc
index 9dd4449b..724b0fd4 100644
--- a/ecp5/globals.cc
+++ b/ecp5/globals.cc
@@ -435,6 +435,9 @@ class Ecp5GlobalRouter
         log_info("Promoting globals...\n");
         auto clocks = get_clocks();
         for (auto clock : clocks) {
+            bool is_global = bool_or_default(clock->attrs, ctx->id("ECP5_IS_GLOBAL"), true);
+            if (!is_global)
+                continue;
             log_info("    promoting clock net %s to global network\n", clock->name.c_str(ctx));
             if (is_ooc) // Don't actually do anything in OOC mode, global routing will be done in the full design
                 clock->is_global = true;
-- 
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