boards: nrf54h20_iron: Allow radio updates

Add necessary changes to provide a simple, updateable radio image.

Signed-off-by: Tomasz Chyrowicz <tomasz.chyrowicz@nordicsemi.no>

boards/nordic/nrf54h20dk/Kconfig.defconfig

@@ -27,3 +27,10 @@ config FLASH_LOAD_OFFSET
 	default 0x2c000 if !USE_DT_CODE_PARTITION
 
 endif # BOARD_NRF54H20DK_NRF54H20_CPUAPP_IRON
+
+if BOARD_NRF54H20DK_NRF54H20_CPURAD_IRON
+
+config ROM_START_OFFSET
+	default 0x800 if BOOTLOADER_MCUBOOT
+
+endif # BOARD_NRF54H20DK_NRF54H20_CPURAD_IRON

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpuapp_iron.dts

@@ -35,3 +35,11 @@ slot0_partition: &cpuapp_slot0_partition {
 slot1_partition: &cpuapp_slot1_partition {
 	label = "image-1";
 };
+
+slot2_partition: &cpurad_slot0_partition {
+	label = "image-2";
+};
+
+slot3_partition: &cpurad_slot1_partition {
+	label = "image-3";
+};

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpurad_iron.dts

@@ -19,3 +19,11 @@
 	mbox-names = "tx", "rx";
 	status = "okay";
 };
+
+slot0_partition: &cpurad_slot0_partition {
+	label = "image-0";
+};
+
+slot1_partition: &cpurad_slot1_partition {
+	label = "image-1";
+};

modules/Kconfig.mcuboot

@@ -227,6 +227,7 @@ config MCUBOOT_BOOTLOADER_MODE_DIRECT_XIP
 
 config MCUBOOT_BOOTLOADER_MODE_DIRECT_XIP_WITH_REVERT
 	bool "MCUboot has been configured for DirectXIP with revert"
+	select MCUBOOT_BOOTUTIL_LIB
 	select MCUBOOT_BOOTUTIL_LIB_FOR_DIRECT_XIP
 	select MCUBOOT_BOOTLOADER_MODE_HAS_NO_DOWNGRADE
 	select MCUBOOT_BOOTLOADER_NO_DOWNGRADE

soc/nordic/nrf54h/soc.c

@@ -173,7 +173,8 @@ void soc_late_init_hook(void)
 
 	void *radiocore_address =
 		(void *)(DT_REG_ADDR(DT_GPARENT(DT_NODELABEL_CPURAD_SLOT0_PARTITION)) +
-				 DT_REG_ADDR(DT_NODELABEL_CPURAD_SLOT0_PARTITION));
+			 DT_REG_ADDR(DT_NODELABEL_CPURAD_SLOT0_PARTITION) +
+			 CONFIG_ROM_START_OFFSET);
 
 	/* Don't wait as this is not yet supported. */
 	bool cpu_wait = false;