From e1e8d8cd14020b3b3ccf1995587438340b65bb5c Mon Sep 17 00:00:00 2001
From: Sylvain Munaut <tnt@246tNt.com>
Date: Fri, 16 Nov 2018 14:44:24 +0100
Subject: [PATCH] ice40: Add warning if an instanciated SB_IO has its
 PACKAGE_PIN used elsewhere

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
---
 ice40/pack.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ice40/pack.cc b/ice40/pack.cc
index 7a27d505..e0a9f6ad 100644
--- a/ice40/pack.cc
+++ b/ice40/pack.cc
@@ -438,6 +438,11 @@ static void pack_io(Context *ctx)
             }
             packed_cells.insert(ci->name);
             std::copy(ci->attrs.begin(), ci->attrs.end(), std::inserter(sb->attrs, sb->attrs.begin()));
+        } else if (is_sb_io(ctx, ci)) {
+            NetInfo *net = ci->ports.at(ctx->id("PACKAGE_PIN")).net;
+            if ((net != nullptr) && (net->users.size() > 1))
+                log_error("PACKAGE_PIN of SB_IO '%s' connected to more than a single top level IO.\n",
+                          ci->name.c_str(ctx));
         }
     }
     for (auto pcell : packed_cells) {