diff --git a/rpi/args.gni b/rpi/args.gni
new file mode 100644
index 0000000..c322192
--- /dev/null
+++ b/rpi/args.gni
@@ -0,0 +1,20 @@
+# Copyright 2019 The Hafnium Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+declare_args() {
+  gpio_base_address = 0
+  aux_base_address = 0
+  core_freq_mhz = 0
+  baudrate = 115200  # standard value
+}