diff --git a/build_tools/kconfig_base.py b/build_tools/kconfig_base.py
new file mode 100755
index 0000000000..13cdb7377a
--- /dev/null
+++ b/build_tools/kconfig_base.py
@@ -0,0 +1,55 @@
+#! /usr/bin/env python3
+#
+# Copyright 2022 Google LLC
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import argparse
+
+from code_formatter import code_formatter
+
+parser = argparse.ArgumentParser()
+parser.add_argument("output", help="path of generated base Kconfig file")
+parser.add_argument("main", help="relative path to the main gem5 Kconfig file")
+parser.add_argument("extras_dirs", nargs="*", help="EXTRAS paths")
+
+args = parser.parse_args()
+
+code = code_formatter()
+
+code(
+    f"""# Automatically generated base Kconfig file, DO NOT EDIT!
+
+source "{args.main}"
+"""
+)
+
+for extras_dir in args.extras_dirs:
+    code(
+        f"""
+osource "{extras_dir}/Kconfig"
+"""
+    )
+
+code.write(args.output)