nrf_modem_lib_init() gets stuck and never finishes for some boards

[charleshaf]

Our nrf9151 boards are getting stuck when nrf_modem_lib_init() is called.

We just see this line. Usually, the device gets past it in less than a second.

[00:00:00.376,983] <dbg> mqtt_helper: mqtt_helper_poll_loop: Waiting for connection_poll_sem

We're using mwf_nrf91x1_2.0.2

With SDK v2.6.2

We have ordered a couple batches of boards.

In one of our batches 2 of 5 boards got stuck at this step, in our most recent batch 3 of 5 boards got stuck on this.

I'm trying to take modem stack trace but I can't get it to build.

I added snippets for nrf91-modem-trace-uart and tf-enable-share-uart

I added CONFIG_NRF_MODEM_LIB_TRACE=y

and in my dts:

    chosen {
        zephyr,console = &uart0;
        zephyr,shell-uart = &uart0;
        zephyr,uart-mcumgr = &uart0;
        nordic,modem-trace-uart = &uart0;
    };

but during build I get:

-- Found devicetree overlay: /opt/nordic/ncs/v2.6.2/nrf/snippets/nrf91-modem-trace-uart/modem-trace-uart.overlay
devicetree error: 'pinctrl-0' is marked as required in 'properties:' in /opt/nordic/ncs/v2.6.2/zephyr/dts/bindings/serial/nordic,nrf-uarte.yaml, but does not appear in <Node /soc/peripheral@40000000/uart@9000 in '/opt/nordic/ncs/v2.6.2/zephyr/misc/empty_file.c'>

[Håkon Alseth]

Hi,

 

If you are able to flash your application, but not update or communicate with the modem, it indicates that there could be a problem with the soldering.

Try to warm up and rework the nRF9151 SiP on your custom board. The issue is usually that some of the RESERVED pins are either shorted to GND or connected to each-other due to excessive solder paste.

 

I added snippets for nrf91-modem-trace-uart and tf-enable-share-uart

modem trace requires a dedicated uart instance.

 

Kind regards,

Håkon