From c861c4925eb9c5598ed909ce234736d0b9c3a4fd Mon Sep 17 00:00:00 2001
From: Andrew Waterman <andrew@sifive.com>
Date: Tue, 4 Apr 2017 12:01:59 -0700
Subject: [PATCH] Don't signal access exceptions on invalid PTEs

The PPN should not be interpreted in this case.
---
 src/main/scala/rocket/PTW.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/scala/rocket/PTW.scala b/src/main/scala/rocket/PTW.scala
index 25b89c6d..cbce2181 100644
--- a/src/main/scala/rocket/PTW.scala
+++ b/src/main/scala/rocket/PTW.scala
@@ -184,7 +184,7 @@ class PTW(n: Int)(implicit edge: TLEdgeOut, p: Parameters) extends CoreModule()(
           state := s_req
           count := count + 1
         }.otherwise {
-          resp_ae := invalid_paddr
+          resp_ae := pte.v && invalid_paddr
           state := s_ready
           resp_valid(r_req_dest) := true
         }