PRD: Clear maintenance IUE attn during memdiags

Change-Id: I54664ee37349f4c1a06a479db8d0a744ae974b90
CQ: SW389265
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/40643
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Brian J. Stegmiller <bjs@us.ibm.com>
Reviewed-by: Caleb N. Palmer <cnpalmer@us.ibm.com>
Reviewed-by: Benjamin J. Weisenbeck <bweisenb@us.ibm.com>
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/40722
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>

src/usr/diag/prdf/plat/mem/prdfMemScrubUtils.C

@@ -196,13 +196,20 @@ uint32_t clearEccFirs<TYPE_MCBIST>( ExtensibleChip * i_chip )
 
             // Maintenance AUEs/IAUEs will be reported as system checkstops.
             // Maintenance IMPEs will be reported as recoverable attentions at
-            // all times. Maintence IUEs will be reported as recoverable in the
-            // field (doesn't stop-on-error), however, we will want to stop the
-            // command in MNFG mode for more accuracy in the callout. So clear
-            // MCAECCFIR[20:32,34:35,38] always and MCAECCFIR[37] in MNFG
-            // mode only.
-            uint64_t mask          = 0xfffff0004dffffffull;
-            if ( mfgMode() ) mask &= 0xfffffffffbffffffull;
+            // all times. Maintence IUEs will be masked during Memory
+            // Diagnostics and handled in the Targeted diagnostics code. After
+            // Memory Diagnostics, maintenance IUEs will be reported as
+            // recoverable in the field (no stop-on-error), but will remain
+            // masked if MNFG thresholds are enabled. In this case, the command
+            // will stop on RCE ETE in order to get a more accuracy callout. So
+            // clear MCAECCFIR[20:32,34:35,38] always and MCAECCFIR[37] in MNFG
+            // mode or during Memory Diagnostics.
+            uint64_t              mask  = 0xfffff0004dffffffull;
+            if ( mfgMode() )      mask &= 0xfffffffffbffffffull;
+            #ifndef __HOSTBOOT_RUNTIME
+            if ( isInMdiaMode() ) mask &= 0xfffffffffbffffffull;
+            #endif
+
             o_rc = __clearFir<TYPE_MCA>( mcaChip, "MCAECCFIR_AND", mask );
             if ( SUCCESS != o_rc ) break;
         }