From 32430bcfc49b0293748ba3f6e5000a45a3dcce92 Mon Sep 17 00:00:00 2001
From: mergify[bot]
Date: Fri, 1 Apr 2022 17:24:56 +0000
Subject: Prevent FIRRTL bulk connects on BlackBox Bundles. (#2468) (#2469)

(cherry picked from commit 4da1e89f3a0b79adcb39ea5defb393ed6c00fa2f)

Co-authored-by: fzi-hielscher <47524191+fzi-hielscher@users.noreply.github.com>---
 core/src/main/scala/chisel3/internal/BiConnect.scala | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'core/src/main')

diff --git a/core/src/main/scala/chisel3/internal/BiConnect.scala b/core/src/main/scala/chisel3/internal/BiConnect.scala
index a8b425f5..2d6c9e4a 100644
--- a/core/src/main/scala/chisel3/internal/BiConnect.scala
+++ b/core/src/main/scala/chisel3/internal/BiConnect.scala
@@ -285,7 +285,13 @@ private[chisel3] object BiConnect {
       case _ => true
     }
 
-    typeCheck && contextCheck && bindingCheck && flow_check && sourceNotLiteralCheck
+    // do not bulk connect the 'io' pseudo-bundle of a BlackBox since it will be decomposed in FIRRTL
+    def blackBoxCheck = Seq(source, sink).map(_._parent).forall {
+      case Some(_: BlackBox) => false
+      case _ => true
+    }
+
+    typeCheck && contextCheck && bindingCheck && flow_check && sourceNotLiteralCheck && blackBoxCheck
   }
 
   // These functions (finally) issue the connection operation
-- 
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