diff --git a/samples/subsys/fs/littlefs/boards/b_u585i_iot02a.conf b/samples/subsys/fs/littlefs/boards/b_u585i_iot02a.conf
new file mode 100644
index 00000000000..c5f2188e4d3
--- /dev/null
+++ b/samples/subsys/fs/littlefs/boards/b_u585i_iot02a.conf
@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2023 OS Systems
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CONFIG_FS_LITTLEFS_FC_HEAP_SIZE=8192
diff --git a/samples/subsys/fs/littlefs/boards/b_u585i_iot02a.overlay b/samples/subsys/fs/littlefs/boards/b_u585i_iot02a.overlay
new file mode 100644
index 00000000000..b4996d70710
--- /dev/null
+++ b/samples/subsys/fs/littlefs/boards/b_u585i_iot02a.overlay
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2023 OS Systems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+ / {
+	fstab {
+		compatible = "zephyr,fstab";
+		lfs1: lfs1 {
+			compatible = "zephyr,fstab,littlefs";
+			read-size = <256>;
+			prog-size = <256>;
+			cache-size = <4096>;
+			lookahead-size = <256>;
+			block-cycles = <512>;
+			partition = <&lfs1_partition>;
+			mount-point = "/lfs1";
+			automount;
+		};
+	};
+};
+
+&mx25lm51245 {
+	partitions {
+		/delete-node/ partition;
+
+		/* Use the whole flash for the filesystem. */
+		lfs1_partition: partition@0 {
+			reg = <0x00000000 DT_SIZE_M(64)>;
+		};
+	};
+};
diff --git a/samples/subsys/fs/littlefs/boards/stm32l562e_dk.conf b/samples/subsys/fs/littlefs/boards/stm32l562e_dk.conf
new file mode 100644
index 00000000000..c5f2188e4d3
--- /dev/null
+++ b/samples/subsys/fs/littlefs/boards/stm32l562e_dk.conf
@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2023 OS Systems
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CONFIG_FS_LITTLEFS_FC_HEAP_SIZE=8192
diff --git a/samples/subsys/fs/littlefs/boards/stm32l562e_dk.overlay b/samples/subsys/fs/littlefs/boards/stm32l562e_dk.overlay
new file mode 100644
index 00000000000..b4996d70710
--- /dev/null
+++ b/samples/subsys/fs/littlefs/boards/stm32l562e_dk.overlay
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2023 OS Systems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+ / {
+	fstab {
+		compatible = "zephyr,fstab";
+		lfs1: lfs1 {
+			compatible = "zephyr,fstab,littlefs";
+			read-size = <256>;
+			prog-size = <256>;
+			cache-size = <4096>;
+			lookahead-size = <256>;
+			block-cycles = <512>;
+			partition = <&lfs1_partition>;
+			mount-point = "/lfs1";
+			automount;
+		};
+	};
+};
+
+&mx25lm51245 {
+	partitions {
+		/delete-node/ partition;
+
+		/* Use the whole flash for the filesystem. */
+		lfs1_partition: partition@0 {
+			reg = <0x00000000 DT_SIZE_M(64)>;
+		};
+	};
+};