diff --git a/src/main/scala/rocketchip/Utils.scala b/src/main/scala/rocketchip/Utils.scala
index ac93ad9d..4b9d3128 100644
--- a/src/main/scala/rocketchip/Utils.scala
+++ b/src/main/scala/rocketchip/Utils.scala
@@ -15,19 +15,19 @@ import java.nio.{ByteBuffer, ByteOrder}
 
 class RangeManager {
   private var finalized = false
-  private val l = collection.mutable.HashMap[String, Int]()
+  private val l = collection.mutable.ListBuffer[(String, Int)]()
   def add(name: String, element: Int) = { require(!finalized); l += (name -> element) }
   def rangeMap = {
     finalized = true
-    l map {
+    (l map {
       var sum = 0
       x => { sum += x._2; (x._1 -> (sum-x._2, sum)) }
-    }
+    }).toMap
   }
   def range(name: String) = rangeMap(name)
   def print = {
-    rangeMap map { case (name, (start, end)) =>
-      println(s"${name} on port ${start}-${end-1}")
+    rangeMap.toSeq.sortBy(_._2).foreach { case (name, (start, end)) =>
+      println(s"${name} on int ${start}-${end-1}")
     }
   }
   def sum = {