From e9cadf29d281920fc886a3a19a4675930845a09d Mon Sep 17 00:00:00 2001
From: Andrew Waterman <andrew@sifive.com>
Date: Thu, 23 Mar 2017 13:18:32 -0700
Subject: [PATCH] Improve DCache MMIO QoR

No need to store the cmd field.  From the perspective of the cache, all
MMIO responses that have data can be treated the same as loads.
---
 src/main/scala/rocket/DCache.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/scala/rocket/DCache.scala b/src/main/scala/rocket/DCache.scala
index 0e432939..b450627d 100644
--- a/src/main/scala/rocket/DCache.scala
+++ b/src/main/scala/rocket/DCache.scala
@@ -312,7 +312,7 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
       val req = uncachedReqs(tl_out.d.bits.source)
       when (grantIsUncachedData) {
         s2_data := tl_out.d.bits.data
-        s2_req.cmd := req.cmd
+        s2_req.cmd := M_XRD
         s2_req.typ := req.typ
         s2_req.tag := req.tag
         s2_req.addr := Cat(s1_paddr >> beatOffBits /* don't-care */, req.addr(beatOffBits-1, 0))