diff --git a/extensions/phal/fw_update_watch.cpp b/extensions/phal/fw_update_watch.cpp
new file mode 100644
index 0000000..a49cc9c
--- /dev/null
+++ b/extensions/phal/fw_update_watch.cpp
@@ -0,0 +1,87 @@
+#include "fw_update_watch.hpp"
+
+#include <fmt/format.h>
+
+#include <phosphor-logging/elog.hpp>
+#include <sdbusplus/exception.hpp>
+
+namespace openpower
+{
+namespace phal
+{
+namespace fwupdate
+{
+using namespace phosphor::logging;
+using Message = std::string;
+using Attributes = std::variant<Message>;
+using PropertyName = std::string;
+using PropertyMap = std::map<PropertyName, Attributes>;
+using InterfaceName = std::string;
+using InterfaceMap = std::map<InterfaceName, PropertyMap>;
+
+void Watch::fwIntfAddedCallback(sdbusplus::message::message& msg)
+{
+    //  DBusInterfaceAdded interfaces;
+    sdbusplus::message::object_path objectPath;
+    InterfaceMap interfaceMap;
+
+    try
+    {
+        msg.read(objectPath, interfaceMap);
+    }
+    catch (const sdbusplus::exception::SdBusError& e)
+    {
+        log<level::ERR>(fmt::format("Failed to parse software add signal"
+                                    "Exception [{}] REPLY_SIG [{}]",
+                                    e.what(), msg.get_signature())
+                            .c_str());
+        return;
+    }
+
+    auto iter = interfaceMap.find("xyz.openbmc_project.Software.Activation");
+    if (iter == interfaceMap.end())
+    {
+        // Skip not related Software Activation
+        return;
+    }
+
+    auto attr = iter->second.find("Activation");
+    if (attr == iter->second.end())
+    {
+        // Skip not related to Activation property.
+        return;
+    }
+
+    auto& imageProperty = std::get<InterfaceName>(attr->second);
+    if (imageProperty.empty())
+    {
+        // Skip, no image property
+        return;
+    }
+
+    if (imageProperty ==
+            "xyz.openbmc_project.Software.Activation.Activations.Ready" &&
+        !isSoftwareUpdateInProgress())
+    {
+        log<level::INFO>("Software path interface add signal received");
+
+        // Set status to code update in progress.
+        // Interface added signal triggered multiple times in code update path,
+        // it's due to additional interfaces added by the software manager app
+        // after the version interface is created.
+        // Device tree data collection is required only for the first trigger
+        setSoftwareUpdateProgress(true);
+
+        // Colect device tree data
+        openpower::phal::fwupdate::exportDevtree();
+    }
+
+    return;
+}
+
+void exportDevtree()
+{}
+
+} // namespace fwupdate
+} // namespace phal
+} // namespace openpower