Workaround for HW421347 Scandalous Pie

This was the core hang going into re-config because of L3pref
unfairness in the L2 CIU between cores.

Change-Id: Ic58c2e0a92e4aef0a1076b09bbdd65e9ba17421a
CQ: HW421347
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/48035
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Reviewed-by: Jenny Huynh <jhuynh@us.ibm.com>
Reviewed-by: James N. Klazynski <jklazyns@us.ibm.com>
Reviewed-by: Matt K. Light <mklight@us.ibm.com>
Dev-Ready: James N. Klazynski <jklazyns@us.ibm.com>
Reviewed-by: Joseph J. McGill <jmcgill@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/48038
Reviewed-by: Hostboot Team <hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

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

@@ -1510,6 +1510,31 @@
     </chipEcFeature>
   </attribute>
   <!-- ******************************************************************** -->
+  <attribute>
+    <id>ATTR_CHIP_EC_FEATURE_HW421347</id>
+    <targetType>TARGET_TYPE_PROC_CHIP, TARGET_TYPE_PROC_CHIP</targetType>
+    <description>
+      Nimbus DD2.1, Cumulus DD1.0 and older: HW421347 Scandalous Pie
+      Core hang when going into re-cfg due to L3pref unfairness in L2 CIU between cores
+    </description>
+    <chipEcFeature>
+      <chip>
+        <name>ENUM_ATTR_NAME_NIMBUS</name>
+        <ec>
+          <value>0x21</value>
+          <test>LESS_THAN_OR_EQUAL</test>
+        </ec>
+      </chip>
+      <chip>
+        <name>ENUM_ATTR_NAME_CUMULUS</name>
+        <ec>
+          <value>0x10</value>
+          <test>LESS_THAN_OR_EQUAL</test>
+        </ec>
+      </chip>
+    </chipEcFeature>
+  </attribute>
+  <!-- ******************************************************************** -->
   <attribute>
     <id>ATTR_CHIP_EC_FEATURE_HW374111</id>
     <targetType>TARGET_TYPE_PROC_CHIP</targetType>