diff --git a/payload_generator/delta_diff_generator.cc b/payload_generator/delta_diff_generator.cc
index 47c92e0..74d43fd 100644
--- a/payload_generator/delta_diff_generator.cc
+++ b/payload_generator/delta_diff_generator.cc
@@ -197,10 +197,12 @@
       unique_ptr<OperationsGenerator> strategy;
       if (!old_part.path.empty()) {
         // Delta update.
-        LOG(INFO) << "Using generator ABGenerator().";
+        LOG(INFO) << "Using generator ABGenerator() for partition "
+                  << new_part.name;
         strategy.reset(new ABGenerator());
       } else {
-        LOG(INFO) << "Using generator FullUpdateGenerator().";
+        LOG(INFO) << "Using generator FullUpdateGenerator() for partition "
+                  << new_part.name;
         strategy.reset(new FullUpdateGenerator());
       }
 
diff --git a/scripts/brillo_update_payload b/scripts/brillo_update_payload
index 3bc87bd..4137dfd 100755
--- a/scripts/brillo_update_payload
+++ b/scripts/brillo_update_payload
@@ -649,7 +649,12 @@
     fi
     partition_names+="${part}"
     new_partitions+="${DST_PARTITIONS[${part}]}"
-    old_partitions+="${SRC_PARTITIONS[${part}]:-}"
+    if [ "${FLAGS_full_boot}" == "true" ] && [ "${part}" == "boot" ]; then
+      # Skip boot partition.
+      old_partitions+=""
+    else
+      old_partitions+="${SRC_PARTITIONS[${part}]:-}"
+    fi
     new_mapfiles+="${DST_PARTITIONS_MAP[${part}]:-}"
     old_mapfiles+="${SRC_PARTITIONS_MAP[${part}]:-}"
   done