samples: subsys: fs_little fs on stm32 qspi disco in xip

Gives a sample to execute the little fs on external memory map
(XiP) where the lfs1 partition is in internal mcu flash

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

samples/subsys/fs/littlefs/boards/stm32h747i_disco_m7.overlay

@@ -4,6 +4,35 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+/ {
+	chosen {
+		zephyr,code-partition = &slot1_partition;
+	};
+
+	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;
+		};
+	};
+};
+
+&flash0 {
+	partitions {
+		lfs1_partition: partition@e0000 {
+			reg = <0x000e0000 DT_SIZE_K(64)>;
+		};
+	};
+};
+
 &sdmmc1 {
         sdmmc {
 		compatible = "zephyr,sdmmc-disk";

samples/subsys/fs/littlefs/boards/stm32l496g_disco.overlay

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2024 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,code-partition = &slot1_partition;
+	};
+
+	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;
+		};
+	};
+};
+
+&flash0 {
+	partitions {
+		lfs1_partition: partition@e0000 {
+			reg = <0x000e0000 DT_SIZE_K(64)>;
+		};
+	};
+};