Drive GPIO high at startup as soon as possible with the nRF54L15https://devzone.nordicsemi.com/f/nordic-q-a/127955/drive-gpio-high-at-startup-as-soon-as-possible-with-the-nrf54l15Hello, in our new project we need to drive a GPIO high as soon as possible after startup. I have tried with the PRE_KERNEL_1 priority for the device driver but still takes 500ms after POR. Is there a way to boot faster or toggle the pin eralieren-USTelligent Community 13Wed, 29 Apr 2026 13:16:31 GMTRE: Drive GPIO high at startup as soon as possible with the nRF54L15https://devzone.nordicsemi.com/thread/565685?ContentTypeID=1Wed, 29 Apr 2026 13:16:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aab54442-4712-4719-93d6-f9af97909c08Susheel Nuguru<p>Hi Andrea,</p> <p>It seems like 500ms is a bit too much. Are you using crystal LF and/or HF clocks. It is good to check if the clock calibration is taking that long time.</p> <p>If you are using secure mode, then TF-M initialization is known to take time aswell. Did you try to use EARLY instead of&nbsp;<span>PRE_KERNEL_1?</span></p><div style="clear:both;"></div>