Problem running ble_app_uart_pca10004e_s112 on nrf52810 target device

[Skols]

I have problems running the ble_app_uart_pca1004e_s112 on a custom nrf52810 target devivce. 

The custom nrf52810 target is a custom board with the Rigado BMD 330, which is based on the nrf52810.

I am using the nrf sdk 15.3.0,  nrf52 DK and SES. The custom target connects as it should via DK, Segger and J-Link (VDD, VTG, GND, swdio, swdclk). Flashing/downloading the app and the SoftDevice to the target goes without any errors. 

By attaching the Segger/ J-link debugger I am able to run the code until  

ret_code = sd_softdevice_enable(&clock_lf_cfg, app_error_fault_handler);

in nrf_sdh.c.

The application does never return from sd_softdevice_enable()

My memory settings are (default ble_app_uart_pca10004e_s112 settings)

For the record: The application runs without any issues on the DK. 

Any suggestions?

[Skols]

To answer my own question: The solution was to be found at Rigados pages: 

https://rigado.zendesk.com/hc/en-us/articles/225674668-Example-files-will-not-run-on-my-hardware-LF-Clock-Source-Selection