Cpuconf

boards/nordic/nrf54h20dk/Kconfig.nrf54h20dk

@@ -4,9 +4,11 @@
 config BOARD_NRF54H20DK
 	select SOC_NRF54H20_CPUAPP if (BOARD_NRF54H20DK_NRF54H20_CPUAPP || \
 				       BOARD_NRF54H20DK_NRF54H20_CPUAPP_IRON)
-	select SOC_NRF54H20_CPURAD if BOARD_NRF54H20DK_NRF54H20_CPURAD
+	select SOC_NRF54H20_CPURAD if (BOARD_NRF54H20DK_NRF54H20_CPURAD || \
+				       BOARD_NRF54H20DK_NRF54H20_CPURAD_IRON)
 	select SOC_NRF54H20_CPUPPR if (BOARD_NRF54H20DK_NRF54H20_CPUPPR || \
 				       BOARD_NRF54H20DK_NRF54H20_CPUPPR_XIP)
 	select SOC_NRF54H20_CPUFLPR if (BOARD_NRF54H20DK_NRF54H20_CPUFLPR || \
 				        BOARD_NRF54H20DK_NRF54H20_CPUFLPR_XIP)
-	select SOC_NRF54H20_IRON if BOARD_NRF54H20DK_NRF54H20_CPUAPP_IRON
+	select SOC_NRF54H20_IRON if (BOARD_NRF54H20DK_NRF54H20_CPUAPP_IRON || \
+				       BOARD_NRF54H20DK_NRF54H20_CPURAD_IRON)

boards/nordic/nrf54h20dk/board.cmake

@@ -2,8 +2,11 @@
 
 include(${ZEPHYR_BASE}/boards/common/nrfutil.board.cmake)
 
-if(CONFIG_BOARD_NRF54H20DK_NRF54H20_CPUAPP OR CONFIG_BOARD_NRF54H20DK_NRF54H20_CPURAD)
-  if(CONFIG_BOARD_NRF54H20DK_NRF54H20_CPUAPP)
+if(CONFIG_BOARD_NRF54H20DK_NRF54H20_CPUAPP OR
+   CONFIG_BOARD_NRF54H20DK_NRF54H20_CPURAD OR
+   CONFIG_BOARD_NRF54H20DK_NRF54H20_CPUAPP_IRON OR
+   CONFIG_BOARD_NRF54H20DK_NRF54H20_CPURAD_IRON)
+  if(CONFIG_SOC_NRF54H20_CPUAPP)
     set(JLINKSCRIPTFILE ${CMAKE_CURRENT_LIST_DIR}/support/nrf54h20_cpuapp.JLinkScript)
   else()
     set(JLINKSCRIPTFILE ${CMAKE_CURRENT_LIST_DIR}/support/nrf54h20_cpurad.JLinkScript)

boards/nordic/nrf54h20dk/board.yml

@@ -11,6 +11,8 @@ board:
       cpucluster: cpuflpr
     - name: iron
       cpucluster: cpuapp
+    - name: iron
+      cpucluster: cpurad
   revision:
     format: major.minor.patch
     default: "0.9.0"

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpuapp_iron.dts

@@ -52,6 +52,10 @@
 			reg = <0xe4000 DT_SIZE_K(64)>;
 		};
 
+		cpurad_slot0_partition: partition@54000 {
+			reg = <0x54000 DT_SIZE_K(256)>;
+		};
+
 		cpuflpr_code_partition: partition@f4000 {
 			reg = <0xf4000 DT_SIZE_K(48)>;
 		};

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpurad_iron.dts

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "nrf54h20dk_nrf54h20_cpurad.dts"
+
+/delete-node/&cpurad_rx_partitions;
+/delete-node/&cpuapp_rx_partitions;
+
+/ {
+	chosen {
+		zephyr,code-partition = &cpurad_slot0_partition;
+		zephyr,uart-mcumgr = &uart135;
+	};
+};
+
+&mram1x {
+	cpurad_rx_partitions: cpurad-rx-partitions {
+		compatible = "nordic,owned-partitions", "fixed-partitions";
+		nordic,access = <NRF_OWNER_ID_RADIOCORE NRF_PERM_RXS>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		cpurad_slot0_partition: partition@54000 {
+			reg = < 0x54000 0x40000 >;
+		};
+	};
+};

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpurad_iron_0_9_0.yaml

@@ -0,0 +1,20 @@
+# Copyright (c) 2025 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+identifier: nrf54h20dk/nrf54h20/cpurad/iron
+name: nRF54H20-DK-nRF54H20-Radio (IRONside SE compatible) (revision 0.9.0)
+type: mcu
+arch: arm
+toolchain:
+  - gnuarmemb
+  - xtools
+  - zephyr
+sysbuild: true
+ram: 192
+flash: 256
+supported:
+  - counter
+  - gpio
+  - pwm
+  - retained_mem
+  - spi

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpurad_iron_defconfig

@@ -0,0 +1,31 @@
+# Copyright (c) 2025 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+# Enable UART driver
+CONFIG_SERIAL=y
+
+# Enable console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+CONFIG_USE_DT_CODE_PARTITION=y
+
+# Enable MPU
+CONFIG_ARM_MPU=y
+
+# Enable hardware stack protection
+CONFIG_HW_STACK_PROTECTION=y
+
+# MPU-based null-pointer dereferencing detection cannot be applied
+# as the (0x0 - 0x400) region is unmapped for this target.
+CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE=y
+
+# Enable cache
+CONFIG_CACHE_MANAGEMENT=y
+CONFIG_EXTERNAL_CACHE=y
+
+# GPD is built on top of NRFS and NRFS support requires SSFv2
+CONFIG_SOC_NRF54H20_GPD=n
+
+# UICR generation is not supported, and when reintroduced will not use nrf-regtool.
+CONFIG_NRF_REGTOOL_GENERATE_UICR=n

samples/sysbuild/hello_world/boards/nrf54h20dk_nrf54h20_cpuapp_iron.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_SOC_NRF54H20_CPURAD_ENABLE=y

samples/sysbuild/hello_world/sample.yaml

@@ -27,6 +27,11 @@ tests:
       - nrf54h20dk/nrf54h20/cpuapp
     extra_args: SB_CONF_FILE=sysbuild/nrf54h20dk_nrf54h20_cpurad.conf
 
+  sample.sysbuild.hello_world.nrf54h20dk_cpuapp_cpurad.iron:
+    platform_allow:
+      - nrf54h20dk/nrf54h20/cpuapp/iron
+    extra_args: SB_CONF_FILE=sysbuild/nrf54h20dk_nrf54h20_cpurad_iron.conf
+
   sample.sysbuild.hello_world.nrf54h20dk_cpuapp_cpuppr:
     platform_allow:
       - nrf54h20dk/nrf54h20/cpuapp

samples/sysbuild/hello_world/sysbuild/nrf54h20dk_nrf54h20_cpurad_iron.conf

@@ -0,0 +1 @@
+SB_CONFIG_REMOTE_BOARD="nrf54h20dk/nrf54h20/cpurad/iron"

soc/nordic/nrf54h/Kconfig

@@ -7,6 +7,8 @@ config SOC_SERIES_NRF54HX
 	select HAS_NRFS
 	select HAS_NRFX
 	select HAS_NORDIC_DRIVERS
+	select SOC_EARLY_INIT_HOOK if ARM
+	select SOC_LATE_INIT_HOOK if SOC_NRF54H20_CPURAD_ENABLE
 	select NRF_PLATFORM_HALTIUM
 
 config SOC_NRF54H20_CPUAPP_COMMON
@@ -63,6 +65,14 @@ config SOC_NRF54H20_CPURAD_COMMON
 	select HAS_PM
 	select HAS_POWEROFF
 
+config SOC_NRF54H20_CPURAD_ENABLE
+	bool "Boot the nRF54H20 Radio core"
+	default y if NRF_802154_SER_HOST
+	help
+	  This will at application boot time enable clock to the
+	  Radiocore, and also power will be requested to the Radiocore
+	  subsystem. The Radiocore will then start executing instructions.
+
 config SOC_NRF54H20_CPURAD
 	select SOC_NRF54H20_CPURAD_COMMON
 

soc/nordic/nrf54h/soc.c

@@ -21,6 +21,7 @@
 #include <soc/nrfx_coredep.h>
 #include <soc_lrcconf.h>
 #include <dmm.h>
+#include <ironside/se/cpuconf.h>
 
 LOG_MODULE_REGISTER(soc, CONFIG_SOC_LOG_LEVEL);
 
@@ -125,7 +126,7 @@ bool z_arm_on_enter_cpu_idle(void)
 }
 #endif
 
-static int nordicsemi_nrf54h_init(void)
+void soc_early_init_hook(void)
 {
 	int err;
 
@@ -137,9 +138,7 @@ static int nordicsemi_nrf54h_init(void)
 	trim_hsfll();
 
 	err = dmm_init();
-	if (err < 0) {
-		return err;
-	}
+	__ASSERT_NO_MSG(err >= 0);
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(ccm030))
 	/* DMASEC is set to non-secure by default, which prevents CCM from
@@ -150,13 +149,26 @@ static int nordicsemi_nrf54h_init(void)
 
 	nrf_spu_periph_perm_dmasec_set(spu, nrf_address_slave_get(ccm030_addr), true);
 #endif
+}
 
-	return 0;
+void soc_late_init_hook(void)
+{
+#if defined(CONFIG_SOC_NRF54H20_CPURAD_ENABLE)
+	int err;
+
+	/* The msg will be used for communication prior to IPC
+	 * communication being set up. But at this moment no such
+	 * communication is required.
+	 */
+	uint8_t *msg = NULL;
+	size_t msg_size = 0;
+
+	err = ironside_se_cpuconf_boot_radiocore(msg, msg_size);
+	__ASSERT_NO_MSG(err == 0);
+#endif
 }
 
 void arch_busy_wait(uint32_t time_us)
 {
 	nrfx_coredep_delay_us(time_us);
 }
-
-SYS_INIT(nordicsemi_nrf54h_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);