Add sysbuild configuration for required for NCS 2.8

Kconfig.sysbuild

@@ -0,0 +1,10 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+config NRF_DEFAULT_IPC_RADIO
+	default y
+
+source "${ZEPHYR_BASE}/share/sysbuild/Kconfig"

README.md

@@ -22,7 +22,18 @@ It has been tested on the nRF5340 Audio DK, but it should work with any nRF5340
 ```sh
 west build --pristine -b nrf5340dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=overlay-usb.conf
 ```
-_HCI over UART and timesync not tested._
+
+### HCI over UART 0 connected to Virtual UART in J-Link Probe
+```sh
+west build --pristine -b nrf5340dk/nrf5340/cpuapp
+```
+
+### HCI over UART 1 connected to Virtual UART in J-Link Probe
+```sh
+west build --pristine -b nrf5340dk/nrf5340/cpuapp
+```
+
+_HCI over UART 1 and timesync not tested._
 
 
 ## nRF5340 Audio DK

sysbuild/ipc_radio/prj.conf

@@ -0,0 +1,50 @@
+#
+# Copyright (c) 2023 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+CONFIG_HEAP_MEM_POOL_SIZE=8192
+CONFIG_MAIN_STACK_SIZE=2048
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
+
+CONFIG_MBOX=y
+CONFIG_IPC_SERVICE=y
+
+CONFIG_BT=y
+CONFIG_BT_HCI_RAW=y
+CONFIG_BT_CTLR_ASSERT_HANDLER=y
+
+CONFIG_BT_ISO_PERIPHERAL=y
+CONFIG_BT_ISO_CENTRAL=y
+CONFIG_BT_ISO_BROADCASTER=y
+CONFIG_BT_ISO_SYNC_RECEIVER=y
+CONFIG_BT_EXT_ADV=y
+CONFIG_BT_PER_ADV_SYNC_TRANSFER_RECEIVER=y
+CONFIG_BT_PER_ADV_SYNC_TRANSFER_SENDER=y
+
+CONFIG_BT_CTLR_CONN_ISO_GROUPS=1
+CONFIG_BT_CTLR_CONN_ISO_STREAMS=2
+CONFIG_BT_CTLR_SYNC_ISO_STREAM_COUNT=2
+CONFIG_BT_CTLR_ADV_ISO_SET=1
+CONFIG_BT_CTLR_ADV_ISO_STREAM_COUNT=2
+
+# Support two links as a central, or one link as a peripheral
+CONFIG_BT_MAX_CONN=3
+CONFIG_BT_CTLR_SDC_PERIPHERAL_COUNT=1
+
+# Allow using more than default advertising event length
+CONFIG_BT_CTLR_ADV_DATA_LEN_MAX=251
+
+# To present the audio at the right point in time, we need the controller and
+# audio clock to be synchronized
+CONFIG_MPSL_TRIGGER_IPC_TASK_ON_RTC_START=y
+CONFIG_MPSL_TRIGGER_IPC_TASK_ON_RTC_START_CHANNEL=4
+
+# Needed for builds with nrf21540
+# Can also be set to 20, but check local restrictions first
+#CONFIG_BT_CTLR_TX_PWR_ANTENNA=10
+#CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=10
+
+CONFIG_IPC_RADIO_BT=y
+CONFIG_IPC_RADIO_BT_HCI_IPC=y

sysbuild/ipc_radio/prj_release.conf

@@ -0,0 +1,56 @@
+#
+# Copyright (c) 2023 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+CONFIG_HEAP_MEM_POOL_SIZE=8192
+CONFIG_MAIN_STACK_SIZE=2048
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
+
+CONFIG_MBOX=y
+CONFIG_IPC_SERVICE=y
+
+CONFIG_BT=y
+CONFIG_BT_HCI_RAW=y
+CONFIG_BT_CTLR_ASSERT_HANDLER=y
+
+CONFIG_BT_ISO_PERIPHERAL=y
+CONFIG_BT_ISO_CENTRAL=y
+CONFIG_BT_ISO_BROADCASTER=y
+CONFIG_BT_ISO_SYNC_RECEIVER=y
+CONFIG_BT_EXT_ADV=y
+CONFIG_BT_PER_ADV_SYNC_TRANSFER_RECEIVER=y
+CONFIG_BT_PER_ADV_SYNC_TRANSFER_SENDER=y
+
+CONFIG_BT_CTLR_CONN_ISO_GROUPS=1
+CONFIG_BT_CTLR_CONN_ISO_STREAMS=2
+CONFIG_BT_CTLR_SYNC_ISO_STREAM_COUNT=2
+CONFIG_BT_CTLR_ADV_ISO_SET=1
+CONFIG_BT_CTLR_ADV_ISO_STREAM_COUNT=2
+
+# Support two links as a central, or one link as a peripheral
+CONFIG_BT_MAX_CONN=3
+CONFIG_BT_CTLR_SDC_PERIPHERAL_COUNT=1
+
+# Allow using more than default advertising event length
+CONFIG_BT_CTLR_ADV_DATA_LEN_MAX=251
+
+# To present the audio at the right point in time, we need the controller and
+# audio clock to be synchronized
+CONFIG_MPSL_TRIGGER_IPC_TASK_ON_RTC_START=y
+CONFIG_MPSL_TRIGGER_IPC_TASK_ON_RTC_START_CHANNEL=4
+
+CONFIG_IPC_RADIO_BT=y
+CONFIG_IPC_RADIO_BT_HCI_IPC=y
+
+# General
+CONFIG_DEBUG=n
+CONFIG_ASSERT=n
+CONFIG_STACK_USAGE=n
+CONFIG_THREAD_MONITOR=n
+CONFIG_SERIAL=n
+CONFIG_CONSOLE=n
+CONFIG_PRINTK=n
+CONFIG_UART_CONSOLE=n
+CONFIG_BOOT_BANNER=n