diff --git a/poky/bitbake/lib/bb/asyncrpc/client.py b/poky/bitbake/lib/bb/asyncrpc/client.py
index 4cdad9a..79919c5 100644
--- a/poky/bitbake/lib/bb/asyncrpc/client.py
+++ b/poky/bitbake/lib/bb/asyncrpc/client.py
@@ -103,13 +103,18 @@
 
         return await self._send_wrapper(proc)
 
+    async def ping(self):
+        return await self.send_message(
+            {'ping': {}}
+        )
+
 
 class Client(object):
     def __init__(self):
         self.client = self._get_async_client()
         self.loop = asyncio.new_event_loop()
 
-        self._add_methods('connect_tcp', 'close')
+        self._add_methods('connect_tcp', 'close', 'ping')
 
     @abc.abstractmethod
     def _get_async_client(self):
diff --git a/poky/bitbake/lib/bb/asyncrpc/serv.py b/poky/bitbake/lib/bb/asyncrpc/serv.py
index cb33846..ef20cb7 100644
--- a/poky/bitbake/lib/bb/asyncrpc/serv.py
+++ b/poky/bitbake/lib/bb/asyncrpc/serv.py
@@ -28,6 +28,7 @@
         self.max_chunk = DEFAULT_MAX_CHUNK
         self.handlers = {
             'chunk-stream': self.handle_chunk,
+            'ping': self.handle_ping,
         }
         self.logger = logger
 
@@ -123,6 +124,10 @@
 
         await self.dispatch_message(msg)
 
+    async def handle_ping(self, request):
+        response = {'alive': True}
+        self.write_message(response)
+
 
 class AsyncServer(object):
     def __init__(self, logger, loop=None):
@@ -142,7 +147,7 @@
         )
 
         for s in self.server.sockets:
-            self.logger.info('Listening on %r' % (s.getsockname(),))
+            self.logger.debug('Listening on %r' % (s.getsockname(),))
             # Newer python does this automatically. Do it manually here for
             # maximum compatibility
             s.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
@@ -168,7 +173,7 @@
         finally:
             os.chdir(cwd)
 
-        self.logger.info('Listening on %r' % path)
+        self.logger.debug('Listening on %r' % path)
 
         self._cleanup_socket = cleanup
         self.address = "unix://%s" % os.path.abspath(path)
@@ -187,7 +192,7 @@
             self.logger.error('Error from client: %s' % str(e), exc_info=True)
             traceback.print_exc()
             writer.close()
-        self.logger.info('Client disconnected')
+        self.logger.debug('Client disconnected')
 
     def run_loop_forever(self):
         try:
@@ -207,7 +212,7 @@
             self.server.close()
 
             self.loop.run_until_complete(self.server.wait_closed())
-            self.logger.info('Server shutting down')
+            self.logger.debug('Server shutting down')
         finally:
             if self.close_loop:
                 if sys.version_info >= (3, 6):
diff --git a/poky/bitbake/lib/bb/build.py b/poky/bitbake/lib/bb/build.py
index b2715fc..6ce8f1e 100644
--- a/poky/bitbake/lib/bb/build.py
+++ b/poky/bitbake/lib/bb/build.py
@@ -927,6 +927,11 @@
                 task_deps[name] = {}
             if name in flags:
                 deptask = d.expand(flags[name])
+                if name in ['noexec', 'fakeroot', 'nostamp']:
+                    if deptask != '1':
+                        bb.warn("In a future version of BitBake, setting the '{}' flag to something other than '1' "
+                                "will result in the flag not being set. See YP bug #13808.".format(name))
+
                 task_deps[name][task] = deptask
         getTask('mcdepends')
         getTask('depends')
diff --git a/poky/bitbake/lib/bb/fetch2/__init__.py b/poky/bitbake/lib/bb/fetch2/__init__.py
index cf0201c..c8e9126 100644
--- a/poky/bitbake/lib/bb/fetch2/__init__.py
+++ b/poky/bitbake/lib/bb/fetch2/__init__.py
@@ -562,6 +562,9 @@
 
         checksum_expected = getattr(ud, "%s_expected" % checksum_id)
 
+        if checksum_expected == '':
+            checksum_expected = None
+
         return {
             "id": checksum_id,
             "name": checksum_name,
@@ -612,7 +615,7 @@
 
     for ci in checksum_infos:
         if ci["expected"] and ci["expected"] != ci["data"]:
-            messages.append("File: '%s' has %s checksum %s when %s was " \
+            messages.append("File: '%s' has %s checksum '%s' when '%s' was " \
                             "expected" % (ud.localpath, ci["id"], ci["data"], ci["expected"]))
             bad_checksum = ci["data"]