diff --git a/klippy/klippy.py b/klippy/klippy.py
index 7ef47384..47eff8c2 100644
--- a/klippy/klippy.py
+++ b/klippy/klippy.py
@@ -144,10 +144,12 @@ class Printer:
         except msgproto.error as e:
             logging.exception("Protocol error")
             self._set_state("%s%s" % (str(e), message_protocol_error))
+            util.dump_mcu_build()
             return
         except mcu.error as e:
             logging.exception("MCU error during connect")
             self._set_state("%s%s" % (str(e), message_mcu_connect_error))
+            util.dump_mcu_build()
             return
         except Exception as e:
             logging.exception("Unhandled exception during connect")
diff --git a/klippy/util.py b/klippy/util.py
index 948ac5ee..201ff528 100644
--- a/klippy/util.py
+++ b/klippy/util.py
@@ -1,11 +1,16 @@
 # Low level unix utility functions
 #
-# Copyright (C) 2016  Kevin O'Connor <kevin@koconnor.net>
+# Copyright (C) 2016-2020  Kevin O'Connor <kevin@koconnor.net>
 #
 # This file may be distributed under the terms of the GNU GPLv3 license.
-import sys, os, pty, fcntl, termios, signal, logging
+import sys, os, pty, fcntl, termios, signal, logging, json, time
 import subprocess, traceback, shlex
 
+
+######################################################################
+# Low-level Unix commands
+######################################################################
+
 # Return the SIGINT interrupt handler back to the OS default
 def fix_sigint():
     signal.signal(signal.SIGINT, signal.SIG_DFL)
@@ -41,6 +46,54 @@ def create_pty(ptyname):
     termios.tcsetattr(mfd, termios.TCSADRAIN, old)
     return mfd
 
+
+######################################################################
+# Helper code for extracting mcu build info
+######################################################################
+
+def dump_file_stats(build_dir, filename):
+    fname = os.path.join(build_dir, filename)
+    try:
+        mtime = os.path.getmtime(fname)
+        fsize = os.path.getsize(fname)
+        timestr = time.asctime(time.localtime(mtime))
+        logging.info("Build file %s(%d): %s", fname, fsize, timestr)
+    except:
+        logging.info("No build file %s", fname)
+
+# Try to log information on the last mcu build
+def dump_mcu_build():
+    build_dir = os.path.join(os.path.dirname(__file__), '..')
+    # Try to log last mcu config
+    dump_file_stats(build_dir, '.config')
+    try:
+        f = open(os.path.join(build_dir, '.config'), 'rb')
+        data = f.read(32*1024)
+        f.close()
+        logging.info("========= Last MCU build config =========\n%s"
+                     "=======================", data)
+    except:
+        pass
+    # Try to log last mcu build version
+    dump_file_stats(build_dir, 'out/klipper.dict')
+    try:
+        f = open(os.path.join(build_dir, 'out/klipper.dict'), 'rb')
+        data = f.read(32*1024)
+        f.close()
+        data = json.loads(data)
+        logging.info("Last MCU build version: %s", data.get('version', ''))
+        logging.info("Last MCU build tools: %s", data.get('build_versions', ''))
+        cparts = ["%s=%s" % (k, v) for k, v in data.get('config', {}).items()]
+        logging.info("Last MCU build config: %s", " ".join(cparts))
+    except:
+        pass
+    dump_file_stats(build_dir, 'out/klipper.elf')
+
+
+######################################################################
+# General system and software information
+######################################################################
+
 def get_cpu_info():
     try:
         f = open('/proc/cpuinfo', 'rb')