Merge pull request #671 from ucb-bar/cork-it

Add a few diplomacy restrictions

src/main/scala/uncore/tilelink2/CacheCork.scala

@@ -14,6 +14,7 @@ class TLCacheCork(unsafe: Boolean = false)(implicit p: Parameters) extends LazyM
   val node = TLAdapterNode(
     clientFn  = { case cp =>
       cp.copy(clients = cp.clients.map { c => c.copy(
+        supportsProbe = TransferSizes.none,
         sourceId = IdRange(c.sourceId.start*2, c.sourceId.end*2))})},
     managerFn = { case mp =>
       mp.copy(

src/main/scala/uncore/tilelink2/Fragmenter.scala

@@ -57,6 +57,7 @@ class TLFragmenter(val minSize: Int, val maxSize: Int, val alwaysMin: Boolean =
       val beatBytes = manager.beatBytes
       val fifoId = managers(0).fifoId
       require (fifoId.isDefined && managers.map(_.fifoId == fifoId).reduce(_ && _))
+      require (manager.endSinkId <= 1)
 
       // We don't support fragmenting to sub-beat accesses
       require (minSize >= beatBytes)