boards: nordic: bm_nrf54l15dk: Reduce MCUboot partition size

Due to optimisations applied to MCUboot configuration, the size of
the partition can be reduced to 31KiB which allows memory protection
to be applied to the section using a single protection region, and
even with logs enabled there is still spare space available in the
slot

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

boards/nordic/bm_nrf54l15dk/bm_nrf54l15dk_nrf54l05_cpuapp_s115_softdevice_mcuboot.dts

@@ -48,14 +48,14 @@
 
 		boot_partition: partition@0 {
 			label = "boot";
-			reg = <0x00000000 DT_SIZE_K(36)>;
+			reg = <0x00000000 DT_SIZE_K(31)>;
 		};
 
-		storage_partition: partition@9000 {
+		storage_partition: partition@7c00 {
 			compatible = "fixed-subpartitions";
 			label = "storage";
-			reg = <0x00009000 DT_SIZE_K(8)>;
-			ranges = <0x0 0x9000 DT_SIZE_K(8)>;
+			reg = <0x00007c00 DT_SIZE_K(8)>;
+			ranges = <0x0 0x7c00 DT_SIZE_K(8)>;
 			#address-cells = <1>;
 			#size-cells = <1>;
 
@@ -70,9 +70,11 @@
 			};
 		};
 
-		slot0_partition: partition@b000 {
+		/* Area from 0x9c00 to 0xa000 is unused due to alignment */
+
+		slot0_partition: partition@a000 {
 			label = "slot0";
-			reg = <0x0000b000 DT_SIZE_K(282)>;
+			reg = <0x000a000 DT_SIZE_K(286)>;
 		};
 
 		slot1_partition: partition@51800 {

boards/nordic/bm_nrf54l15dk/bm_nrf54l15dk_nrf54l10_cpuapp_s115_softdevice_mcuboot.dts

@@ -48,14 +48,14 @@
 
 		boot_partition: partition@0 {
 			label = "boot";
-			reg = <0x00000000 DT_SIZE_K(36)>;
+			reg = <0x00000000 DT_SIZE_K(31)>;
 		};
 
-		storage_partition: partition@9000 {
+		storage_partition: partition@7c00 {
 			compatible = "fixed-subpartitions";
 			label = "storage";
-			reg = <0x00009000 DT_SIZE_K(8)>;
-			ranges = <0x0 0x9000 DT_SIZE_K(8)>;
+			reg = <0x00007c00 DT_SIZE_K(8)>;
+			ranges = <0x0 0x7c00 DT_SIZE_K(8)>;
 			#address-cells = <1>;
 			#size-cells = <1>;
 
@@ -70,9 +70,11 @@
 			};
 		};
 
-		slot0_partition: partition@b000 {
+		/* Area from 0x9c00 to 0xa000 is unused due to alignment */
+
+		slot0_partition: partition@a000 {
 			label = "slot0";
-			reg = <0x0000b000 DT_SIZE_K(794)>;
+			reg = <0x0000a000 DT_SIZE_K(798)>;
 		};
 
 		slot1_partition: partition@d1800 {

boards/nordic/bm_nrf54l15dk/bm_nrf54l15dk_nrf54l15_cpuapp_s115_softdevice_mcuboot.dts

@@ -48,14 +48,14 @@
 
 		boot_partition: partition@0 {
 			label = "boot";
-			reg = <0x00000000 DT_SIZE_K(36)>;
+			reg = <0x00000000 DT_SIZE_K(31)>;
 		};
 
-		storage_partition: partition@9000 {
+		storage_partition: partition@7c00 {
 			compatible = "fixed-subpartitions";
 			label = "storage";
-			reg = <0x00009000 DT_SIZE_K(8)>;
-			ranges = <0x0 0x9000 DT_SIZE_K(8)>;
+			reg = <0x00007c00 DT_SIZE_K(8)>;
+			ranges = <0x0 0x7c00 DT_SIZE_K(8)>;
 			#address-cells = <1>;
 			#size-cells = <1>;
 
@@ -70,9 +70,11 @@
 			};
 		};
 
-		slot0_partition: partition@b000 {
+		/* Area from 0x9c00 to 0xa000 is unused due to alignment */
+
+		slot0_partition: partition@a000 {
 			label = "slot0";
-			reg = <0x0000b000 DT_SIZE_K(1306)>;
+			reg = <0x0000a000 DT_SIZE_K(1310)>;
 		};
 
 		slot1_partition: partition@151800 {