From 1be13d6b4c2679e8890eca51447ace26380cd264 Mon Sep 17 00:00:00 2001
From: Megan Wachs <megan@sifive.com>
Date: Wed, 19 Apr 2017 19:44:51 -0700
Subject: [PATCH] PLIC: To avoid hazard between enable -> claim, enforce
 concurrency=1

---
 src/main/scala/uncore/devices/Plic.scala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/scala/uncore/devices/Plic.scala b/src/main/scala/uncore/devices/Plic.scala
index 6c95cca8..5507eb1a 100644
--- a/src/main/scala/uncore/devices/Plic.scala
+++ b/src/main/scala/uncore/devices/Plic.scala
@@ -75,7 +75,8 @@ class TLPLIC(maxPriorities: Int, address: BigInt = 0xC000000)(implicit p: Parame
     address   = Seq(AddressSet(address, PLICConsts.size-1)),
     device    = device,
     beatBytes = p(XLen)/8,
-    undefZero = false)
+    undefZero = false,
+    concurrency = 1) // Work around the enable -> claim hazard
 
   val intnode = IntNexusNode(
     numSourcePorts = 0 to 1024,