HW467590 - WAT Solution to prevent ARMWF starvation early hang

Change-Id: I72b6ea74f053a13532a7d0f887795cfc0160cef2
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/67324
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Reviewed-by: SHELTON LEUNG <sleung@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Jenny Huynh <jhuynh@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/67331
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

src/import/chips/p9/procedures/xml/attribute_info/chip_ec_attributes.xml

@@ -7848,6 +7848,25 @@
     </chipEcFeature>
   </attribute>
   <!-- ******************************************************************** -->
+  <attribute>
+    <id>ATTR_CHIP_EC_FEATURE_HW467590</id>
+    <targetType>TARGET_TYPE_PROC_CHIP</targetType>
+    <description>
+        Enable MC WAT to inject stalls into Read Queue when Atomic Read Modify Write
+        Fetch operations request read buffer access. This produces a gap to allow the  
+        operation to complete.
+    </description>
+    <chipEcFeature>
+      <chip>
+        <name>ENUM_ATTR_NAME_CUMULUS</name>
+        <ec>
+          <value>0x10</value>
+          <test>GREATER_THAN_OR_EQUAL</test>
+        </ec>
+      </chip>
+    </chipEcFeature>
+    </attribute> 
+  <!-- ******************************************************************** -->
   <attribute>
     <id>ATTR_CHIP_EC_FEATURE_HW461448</id>
     <targetType>TARGET_TYPE_PROC_CHIP</targetType>