https://devzone.nordicsemi.com/f/nordic-q-a/80911/running-zephyr-without-optimisationHi All! I&#39;d like to ask if anybody succeeded running zephyr without optimizations? For ex. i have a following code: Now i have following problems: 1) If i set optimization level to O0, then Zephyr even doesn&#39;t start :) - Why? is there anyen-USTelligent Community 13Fri, 22 Oct 2021 09:44:00 GMThttps://devzone.nordicsemi.com/thread/335438?ContentTypeID=1Fri, 22 Oct 2021 09:44:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ebbe620-ce36-4447-9b41-3c50c662cf5dMichal Obrembski<p>I&#39;ve not set stack size in prj.conf, but after your suggestion, it works! :)</p> <p>Thank you!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/335262?ContentTypeID=1Thu, 21 Oct 2021 11:03:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:76a9ef3d-f616-42f3-bc3f-2fdfa593df9cJared<p>Hi,</p> <p>What is&nbsp;CONFIG_MAIN_STACK_SIZE set to in your .cnf file? Can you try setting it to CONFIG_MAIN_STACK_SIZE=8192</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>