diff --git a/fdts/stm32mp157a-ed1-fw-config.dts b/fdts/stm32mp157a-ed1-fw-config.dts
new file mode 100644
index 0000000..2abbe50
--- /dev/null
+++ b/fdts/stm32mp157a-ed1-fw-config.dts
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright (c) 2020-2021, STMicroelectronics - All Rights Reserved
+ */
+
+#define DDR_SIZE	0x40000000 /* 1GB */
+#include "stm32mp15-fw-config.dtsi"