HW407123: Slow down xlink command rate for Nimbus DD1/2

Change-Id: Ibb2f8315aeeeddc5b9635ec579137a46a0b16587
Original-Change-Id: I5e1d5f6ff0b0139765d1dc30636cec30b91e37d6
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/39132
Tested-by: Jenkins Server <pfd-jenkins+hostboot@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: Kevin F. Reick <reick@us.ibm.com>
Reviewed-by: DANIEL C. HOWE <dchowe@us.ibm.com>
Reviewed-by: Thi N. Tran <thi@us.ibm.com>

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

@@ -1720,6 +1720,25 @@
     </chipEcFeature>
   </attribute>
   <!-- ******************************************************************** -->
+  <attribute>
+    <id>ATTR_CHIP_EC_FEATURE_HW407123</id>
+    <targetType>TARGET_TYPE_PROC_CHIP</targetType>
+    <description>
+      Nimbus DD1,DD2: enable workarounds for HW407123 in FBC initfile
+      Slow down xlink cmd rate to work around broken single link credit dial
+      that would have prevented rcmd overflows
+    </description>
+    <chipEcFeature>
+      <chip>
+        <name>ENUM_ATTR_NAME_NIMBUS</name>
+        <ec>
+          <value>0x20</value>
+          <test>LESS_THAN_OR_EQUAL</test>
+        </ec>
+      </chip>
+    </chipEcFeature>
+  </attribute>
+  <!-- ******************************************************************** -->
   <attribute>
     <id>ATTR_CHIP_EC_FEATURE_HW378025</id>
     <targetType>TARGET_TYPE_PROC_CHIP</targetType>