Hi Ewout, I get the first warning as well, but ignore this as I know that ESP8266 should be able to run this software. You see in the output that the ESP architecture is recognized (I put that Serial in a a debug).
The second watchdog reset message is something I do not get. From doing other things with the ESP8266 I know that I get that if the ESP8266 needs time to process its WiFi stack procesing and it does not get enough time to do it as it is working on user programs.
- I do run the library not in that location but in my sketch directory together with my other libraries.
Are you only running the lmic stack, or also doing WiFi or other work?
I see that after the wdt that the stack resets again, and see that it tries to read somehing from the rfm95 chip. Maybe re-check connections to the RFM95.