boards: st: b_u585i_iot02a: ns: Redesign flash partitions

The current b_u585i_iot02a NS flash layout difficult the development
of large applications. Since there is an external NOR memory which
is already supported by tf-m, this proposes a layout reconfiguration
which allows bigger bootloader, S and NS software. This new layout is
synced with TF-M mainline, see:

https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/41126

The bootloader BL2 now will fetch FOTA content from the external memory.

Signed-off-by: BUDKE Gerson Fernando <[email protected]>

Author: nandojve

boards/st/b_u585i_iot02a/b_u585i_iot02a_stm32u585xx_ns.dts

@@ -34,44 +34,59 @@
 
 		/*
 		 * Following flash partition is compatible with requirements
-		 * given in TFM configuration given for current board.
-		 * It might require adjustment depending on evolutions on TFM.
+		 * given in TF-M configuration given for current board.
+		 *
+		 * It might require adjustment depending on evolutions on TF-M.
 		 */
-
 		boot_partition: partition@0 {
 			label = "mcuboot";
-			reg = <0x00000000 DT_SIZE_K(224)>;
+			reg = <0x00000000 DT_SIZE_K(384)>;
 			read-only;
 		};
 
 		/* Secure image primary slot */
-		slot0_partition: partition@38000 {
+		slot0_partition: partition@60000 {
 			label = "image-0";
-			reg = <0x00038000 DT_SIZE_K(384)>;
+			reg = <0x00060000 DT_SIZE_K(512)>;
 		};
 
 		/* Non-secure image primary slot */
-		slot0_ns_partition: partition@98000 {
+		slot0_ns_partition: partition@e0000 {
 			label = "image-0-nonsecure";
-			reg = <0x00098000 DT_SIZE_K(512)>;
+			reg = <0x000e0000 DT_SIZE_K(1024)>;
+		};
+
+		/* Internal Non Volatile Storage */
+		storage_partition: partition@1e0000 {
+			label = "storage";
+			reg = <0x001e0000 DT_SIZE_K(128)>;
 		};
+	};
+};
+
+&mx25lm51245 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
 
-		/* Secure image secondary slot */
-		slot1_partition: partition@118000 {
+		/*
+		 * The flash partition (0 and 1) are aligned
+		 * with the TF-M flash layout expectation.
+		 */
+		slot1_partition: partition@0 {
 			label = "image-1";
-			reg = <0x00118000 DT_SIZE_K(384)>;
+			reg = <0x00000000 DT_SIZE_K(512)>;
 		};
 
-		/* Non-secure image secondary slot */
-		slot1_ns_partition: partition@178000 {
+		slot1_ns_partition: partition@80000 {
 			label = "image-1-nonsecure";
-			reg = <0x00178000 DT_SIZE_K(512)>;
+			reg = <0x00080000 DT_SIZE_K(1024)>;
 		};
 
-		/* Applicative Non Volatile Storage */
-		storage_partition: partition@1f8000 {
-			label = "storage";
-			reg = <0x001f8000 DT_SIZE_K(16)>;
+		external_partition: partition@180000 {
+			label = "external";
+			reg = <0x00180000 (DT_SIZE_M(64) - DT_SIZE_K(1024) - DT_SIZE_K(512))>;
 		};
 	};
 };

doc/releases/migration-guide-4.3.rst

@@ -29,6 +29,11 @@ Kernel
 Boards
 ******
 
+* b_u585i_iot02a//ns: flash layout was changed to be in sync with tf-m board configurations.
+  The new layout expand the flash partitions moving the secondary ones to the external NOR.
+  This is a breaking change in firmware upgrade (FOTA) will not be able to upgrade a older
+  Zephyr image.
+
 * mimxrt11x0: renamed lpadc1 to lpadc2 and renamed lpadc0 to lpadc1.
 
 Device Drivers and Devicetree