I need help with this issue. I'm updating the code from SDK 2.4.2 to SDK 2.9.2. I had change the device tree to HWM2 and I'm using sysbuild.

The build log is showing this warning:

warning: BT_CTLR_RX_BUFFERS (defined at subsys/bluetooth\controller/Kconfig:225) was assigned the
value '10' but got the value ''. Check these unsatisfied dependencies: BT_LL_SW_SPLIT (=n). See
http://docs.zephyrproject.org/latest/kconfig.html#CONFIG_BT_CTLR_RX_BUFFERS and/or look up
BT_CTLR_RX_BUFFERS in the menuconfig/guiconfig interface. The Application Development Primer,
Setting Configuration Values, and Kconfig - Tips and Best Practices sections of the manual might be
helpful too.

After I had set CONFIG_BT_LL_SW_SPLIT in HCI_IPC_CONF I got more errors:

After a day trying to figure out what I'm missing I decided to use the hello world sample with nrf5340dk and I got the same error. Below I copied the log.

Executing task: nRF Connect: Generate config nrf5340dk/nrf5340/cpuapp for hello_world/app

Building app
C:\windows\system32\cmd.exe /d /s /c "west build --build-dir c:/Work/nrf-samples/hello_world/app/build c:/Work/nrf-samples/hello_world/app --pristine --board nrf5340dk/nrf5340/cpuapp --sysbuild -- -DNCS_TOOLCHAIN_VERSION=NONE -DCONF_FILE=prj.conf -DBOARD_ROOT=c:/work/nrf-samples/hello_world"

-- west build: generating a build system
Loading Zephyr module(s) (Zephyr base): sysbuild_default
-- Found Python3: C:/ncs/toolchains/b620d30767/opt/bin/python.exe (found suitable version "3.12.4", minimum required is "3.8") found components: Interpreter
-- Cache files will be written to: C:/ncs/v2.9.2/zephyr/.cache
-- Found west (found suitable version "1.2.0", minimum required is "0.14.0")
-- Board: nrf5340dk, qualifiers: nrf5340/cpuapp
Parsing c:/Work/nrf-samples/hello_world/app/Kconfig.sysbuild
Loaded configuration 'C:/Work/nrf-samples/hello_world/app/build/_sysbuild/empty.conf'
Merged configuration 'c:/Work/nrf-samples/hello_world/app/sysbuild.conf'
Configuration saved to 'C:/Work/nrf-samples/hello_world/app/build/zephyr/.config'
Kconfig header saved to 'C:/Work/nrf-samples/hello_world/app/build/_sysbuild/autoconf.h'
--
*****************************
* Running CMake for mcuboot *
*****************************

Loading Zephyr default modules (Zephyr base).
-- Application: C:/ncs/v2.9.2/bootloader/mcuboot/boot/zephyr
-- CMake version: 3.21.0
-- Found Python3: C:/ncs/toolchains/b620d30767/opt/bin/python.exe (found suitable version "3.12.4", minimum required is "3.8") found components: Interpreter
-- Cache files will be written to: C:/ncs/v2.9.2/zephyr/.cache
-- Zephyr version: 3.7.99 (C:/ncs/v2.9.2/zephyr)
-- Found west (found suitable version "1.2.0", minimum required is "0.14.0")
-- Board: nrf5340dk, qualifiers: nrf5340/cpuapp
-- Found host-tools: zephyr 0.17.0 (C:/ncs/toolchains/b620d30767/opt/zephyr-sdk)
-- Found toolchain: zephyr 0.17.0 (C:/ncs/toolchains/b620d30767/opt/zephyr-sdk)
-- Found Dtc: C:/ncs/toolchains/b620d30767/opt/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found BOARD.dts: C:/ncs/v2.9.2/zephyr/boards/nordic/nrf5340dk/nrf5340dk_nrf5340_cpuapp.dts
-- Found devicetree overlay: C:/Work/nrf-samples/hello_world/app/sysbuild/mcuboot.overlay
-- Found devicetree overlay: C:/ncs/v2.9.2/nrf/modules/mcuboot/flash_sim.overlay
-- Generated zephyr.dts: C:/Work/nrf-samples/hello_world/app/build/mcuboot/zephyr/zephyr.dts
-- Generated devicetree_generated.h: C:/Work/nrf-samples/hello_world/app/build/mcuboot/zephyr/include/generated/zephyr/devicetree_generated.h
-- Including generated dts.cmake file: C:/Work/nrf-samples/hello_world/app/build/mcuboot/zephyr/dts.cmake
Parsing C:/ncs/v2.9.2/bootloader/mcuboot/boot/zephyr/Kconfig
Loaded configuration 'C:/ncs/v2.9.2/zephyr/boards/nordic/nrf5340dk/nrf5340dk_nrf5340_cpuapp_defconfig'
Merged configuration 'C:/ncs/v2.9.2/bootloader/mcuboot/boot/zephyr/prj.conf'
Merged configuration 'C:/Work/nrf-samples/hello_world/app/sysbuild/mcuboot.conf'
Merged configuration 'C:/ncs/v2.9.2/nrf/subsys/bootloader/bl_override/override_external_mcuboot.conf'
Merged configuration 'C:/ncs/v2.9.2/nrf/subsys/partition_manager/ext_flash_mcuboot_secondary.conf'
Merged configuration 'C:/Work/nrf-samples/hello_world/app/build/mcuboot/zephyr/.config.sysbuild'
Configuration saved to 'C:/Work/nrf-samples/hello_world/app/build/mcuboot/zephyr/.config'
Kconfig header saved to 'C:/Work/nrf-samples/hello_world/app/build/mcuboot/zephyr/include/generated/zephyr/autoconf.h'
-- Found GnuLd: c:/ncs/toolchains/b620d30767/opt/zephyr-sdk/arm-zephyr-eabi/arm-zephyr-eabi/bin/ld.bfd.exe (found version "2.38")
-- The C compiler identification is GNU 12.2.0
-- The CXX compiler identification is GNU 12.2.0
-- The ASM compiler identification is GNU
-- Found assembler: C:/ncs/toolchains/b620d30767/opt/zephyr-sdk/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc.exe
-- Setting build type to 'MinSizeRel' as none was specified.
MCUBoot bootloader key file: C:/ncs/v2.9.2/bootloader/mcuboot/root-ec-p256.pem
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Work/nrf-samples/hello_world/app/build/mcuboot
--
*****************************
* Running CMake for hci_ipc *
*****************************

Loading Zephyr default modules (Zephyr base).
-- Application: C:/ncs/v2.9.2/zephyr/samples/bluetooth/hci_ipc
-- CMake version: 3.21.0
-- Found Python3: C:/ncs/toolchains/b620d30767/opt/bin/python.exe (found suitable version "3.12.4", minimum required is "3.8") found components: Interpreter
-- Cache files will be written to: C:/ncs/v2.9.2/zephyr/.cache
-- Zephyr version: 3.7.99 (C:/ncs/v2.9.2/zephyr)
-- Found west (found suitable version "1.2.0", minimum required is "0.14.0")
-- Board: nrf5340dk, qualifiers: nrf5340/cpunet
-- Found host-tools: zephyr 0.17.0 (C:/ncs/toolchains/b620d30767/opt/zephyr-sdk)
-- Found toolchain: zephyr 0.17.0 (C:/ncs/toolchains/b620d30767/opt/zephyr-sdk)
-- Found Dtc: C:/ncs/toolchains/b620d30767/opt/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found BOARD.dts: C:/ncs/v2.9.2/zephyr/boards/nordic/nrf5340dk/nrf5340dk_nrf5340_cpunet.dts
-- Found devicetree overlay: C:/Work/nrf-samples/hello_world/app/sysbuild/hci_ipc.overlay
-- Generated zephyr.dts: C:/Work/nrf-samples/hello_world/app/build/hci_ipc/zephyr/zephyr.dts
-- Generated devicetree_generated.h: C:/Work/nrf-samples/hello_world/app/build/hci_ipc/zephyr/include/generated/zephyr/devicetree_generated.h
-- Including generated dts.cmake file: C:/Work/nrf-samples/hello_world/app/build/hci_ipc/zephyr/dts.cmake

warning: BT_CTLR_SDC_PERIPHERAL_COUNT (defined at
C:/ncs/v2.9.2/nrf\subsys\bluetooth\controller/Kconfig:139) was assigned the value '2' but got the
value ''. Check these unsatisfied dependencies: BT_LL_SOFTDEVICE (=n). See
http://docs.zephyrproject.org/latest/kconfig.html#CONFIG_BT_CTLR_SDC_PERIPHERAL_COUNT and/or look up
BT_CTLR_SDC_PERIPHERAL_COUNT in the menuconfig/guiconfig interface. The Application Development
Primer, Setting Configuration Values, and Kconfig - Tips and Best Practices sections of the manual
might be helpful too.


warning: BT_CTLR_ADV_DATA_LEN_MAX (defined at subsys/bluetooth\controller/Kconfig:714) was assigned
the value '255' but got the value '31'. See
http://docs.zephyrproject.org/latest/kconfig.html#CONFIG_BT_CTLR_ADV_DATA_LEN_MAX and/or look up
BT_CTLR_ADV_DATA_LEN_MAX in the menuconfig/guiconfig interface. The Application Development Primer,
Setting Configuration Values, and Kconfig - Tips and Best Practices sections of the manual might be
helpful too.


warning: Experimental symbol BT_LL_SW_SPLIT is enabled.


warning: user value 255 on the int symbol BT_CTLR_ADV_DATA_LEN_MAX (defined at subsys/bluetooth\controller/Kconfig:714) ignored due to being outside the active range ([31, 191]) -- falling back on defaults
Parsing C:/ncs/v2.9.2/zephyr/Kconfig
Loaded configuration 'C:/ncs/v2.9.2/zephyr/boards/nordic/nrf5340dk/nrf5340dk_nrf5340_cpunet_defconfig'
Merged configuration 'C:/ncs/v2.9.2/zephyr/samples/bluetooth/hci_ipc/prj.conf'
Merged configuration 'C:/Work/nrf-samples/hello_world/app/sysbuild/hci_ipc.conf'
Merged configuration 'C:/Work/nrf-samples/hello_world/app/build/hci_ipc/zephyr/.config.sysbuild'

error: Aborting due to Kconfig warnings

CMake Error at C:/ncs/v2.9.2/zephyr/cmake/modules/kconfig.cmake:396 (message):
command failed with return code: 1
Call Stack (most recent call first):
C:/ncs/v2.9.2/nrf/cmake/modules/kconfig.cmake:29 (include)
C:/ncs/v2.9.2/zephyr/cmake/modules/zephyr_default.cmake:133 (include)
C:/ncs/v2.9.2/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
C:/ncs/v2.9.2/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
CMakeLists.txt:5 (find_package)


-- Configuring incomplete, errors occurred!
CMake Error at cmake/modules/sysbuild_extensions.cmake:514 (message):
CMake configure failed for Zephyr project: hci_ipc

Location: C:/ncs/v2.9.2/zephyr/samples/bluetooth/hci_ipc
Call Stack (most recent call first):
cmake/modules/sysbuild_images.cmake:20 (ExternalZephyrProject_Cmake)
cmake/modules/sysbuild_default.cmake:20 (include)
C:/ncs/v2.9.2/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:75 (include)
C:/ncs/v2.9.2/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
C:/ncs/v2.9.2/zephyr/share/sysbuild-package/cmake/SysbuildConfig.cmake:8 (include)
template/CMakeLists.txt:10 (find_package)


-- Configuring incomplete, errors occurred!
See also "C:/Work/nrf-samples/hello_world/app/build/CMakeFiles/CMakeOutput.log".
FATAL ERROR: command exited with status 1: 'C:\ncs\toolchains\b620d30767\opt\bin\cmake.EXE' -DWEST_PYTHON=C:/ncs/toolchains/b620d30767/opt/bin/python.exe '-Bc:\Work\nrf-samples\hello_world\app\build' -GNinja -DBOARD=nrf5340dk/nrf5340/cpuapp -DNCS_TOOLCHAIN_VERSION=NONE -DCONF_FILE=prj.conf -DBOARD_ROOT=c:/work/nrf-samples/hello_world '-SC:\ncs\v2.9.2\zephyr\share\sysbuild' '-DAPP_DIR:PATH=c:\Work\nrf-samples\hello_world\app'

* The terminal process terminated with exit code: 1.
* Terminal will be reused by tasks, press any key to close it.

Here my test code using the hello_world sample.

 File: hello_world.zip