nRF SDK 2.9.2: BT_CTLR_RX_BUFFERS unsatisfied dependencies: BT_LL_SW_SPLIT (=n)

[Leiser]

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
docs.zephyrproject.org/.../kconfig.html 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.

./cfs-file/__key/communityserver-discussions-components-files/4/compilation-log.txt

Here my test code using the hello_world sample.

/cfs-file/__key/communityserver-discussions-components-files/4/0005.hello_5F00_world.zip

[Menon]

Hello,

Susheel is a bit tied up with some other tasks at the moment, and I will help you in the meantime.

The warning you posted in your opening query says that the configuration option is only available when the Zephyr Bluetooth Link Layer (BT_LL_SW_SPLIT) is enabled. If BT_LL_SW_SPLIT is not enabled (=n), then CONFIG_BT_CTLR_RX_BUFFERS is ignored, resulting in the warning.

I see that you are enabling the Zephyr controller here. From SDK v2.8.0 onwards, you need to build with this snippet to enable the Zephyr BLE controller. See this DevZone case which shows how you can do the same. I guess this is the issue you are facing, let me know if it's not, and I will take a look into the hello_world sample you shared.

Kind regards,
Abhijith

[Leiser]

I added bt-ll-sw-split snippet.

Below the west command generated by VsCode:

west build --build-dir c:/Work/nrf-samples/hello_world/app/build c:/Work/nrf-samples/hello_world/app --pristine --board nrf5340dk/nrf5340/cpuapp -- -DNCS_TOOLCHAIN_VERSION=NONE -DCONF_FILE=prj.conf -DSNIPPET=bt-ll-sw-split -DBOARD_ROOT=c:/work/nrf-samples/hello_world

I got the following error:

devicetree error: C:/ncs/v2.9.2/zephyr/snippets/bt-ll-sw-split/bt-ll-sw-split.overlay:1 (column 1): parse error: undefined node label 'bt_hci_controller'
CMake Error at C:/ncs/v2.9.2/zephyr/cmake/modules/dts.cmake:295 (execute_process):
execute_process failed command indexes:

1: "Child return code: 1"