s110 v7.1.0 sd_app_evt_wait() fails after second call on custom nRF51822

[tyana]

I am testing an example from nRF SDK 7.2.0 on a custom board with nRF51822 QFAAH2 chip. This simple example is ble_app_template adapted for Segger, it should advertise and accept connections. I am required to use SoftDevice S110 v7.1.0 for this project, hence the old SDK.

The projects crashes on my custom nRF51822 after I call sd_app_evt_wait() in the main for() loop for the second time.

Call stack shows unknown functions at weird addresses:

Exactly the same error occurs with the bootloader example.

Both examples run perfectly on nRF51422 QFAC DK. RAM settings are correct for nRF51822 xxAA.

What am I missing?

[tyana]

Redefined __SYSTEM_CLOCK in system_nrf51.c to a different frequency (32MHz unstead of 16) as per an engineer of the custom board manufacturer tip.