diff --git a/group/tftf-l1-build/nil,fvp-rme:nil b/group/tftf-l1-build/nil,fvp-rme:nil
new file mode 100644
index 0000000..796740a
--- /dev/null
+++ b/group/tftf-l1-build/nil,fvp-rme:nil
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2025, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+pre_tftf_build() {
+	# Clone mbedTLS submodule
+	cd "$tftf_root"
+	git submodule update --init
+}