From 73b026366301c29b74be13b05b3a8bb16bfd2260 Mon Sep 17 00:00:00 2001
From: Howard Mao <zhehao.mao@gmail.com>
Date: Tue, 1 Dec 2015 20:41:58 -0800
Subject: [PATCH] disconnect fpu port if no fpu-using RoCC accelerators

---
 rocket/src/main/scala/tile.scala | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/rocket/src/main/scala/tile.scala b/rocket/src/main/scala/tile.scala
index 8878e722..09c4f006 100644
--- a/rocket/src/main/scala/tile.scala
+++ b/rocket/src/main/scala/tile.scala
@@ -110,4 +110,11 @@ class RocketTile(resetSignal: Bool = null)(implicit p: Parameters) extends Tile(
 
     roccs.flatMap(_.io.dmem) :+ iMemArb.io.out
   } else { Seq(icache.io.mem) })
+
+  if (!usingRocc || nFPUPorts == 0) {
+    fpuOpt.foreach { fpu =>
+      fpu.io.cp_req.valid := Bool(false)
+      fpu.io.cp_resp.ready := Bool(false)
+    }
+  }
 }