https://devzone.nordicsemi.com/f/nordic-q-a/88310/serial-lte-modem---too-long-initialization-after-reset-by-pinNCS main, Serial LTE Modem app prj.conf CONFIG_SLM_START_SLEEP=y CONFIG_SLM_WAKEUP_PIN=6 CONFIG_SLM_INDICATE_PIN=2 CONFIG_NRF_MODEM_LIB_TRACE_ENABLED=y SLM initialization takes an unexpectedly long time ~1,5s. Expected is ~25ms. Host must waiten-USTelligent Community 13Tue, 31 May 2022 07:13:11 GMThttps://devzone.nordicsemi.com/thread/370106?ContentTypeID=1Tue, 31 May 2022 07:13:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c026b3f1-423c-4155-b75b-cb43499c5b4aH&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>The time from reset to &quot;Ready&quot; is printed is around 800 ms from reset:</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1653980617862v1.png" alt=" " /></p> <p>And it is similar when waking up from system off (last line is the button press):</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1653981125025v2.png" alt=" " />&nbsp;</p> <p></p> <p>This is because there&#39;s essentially three applications starting:</p> <p>* mcuboot</p> <p>* spm</p> <p>* SLM</p> <p>&nbsp;</p> <p>In addition, the startup of the 32 kHz source is in the range of several hundred milliseconds:</p> <p><a href="https://infocenter.nordicsemi.com/topic/ps_nrf9160/pmu_oscillators.html?cp=2_0_0_4_3_3_2#unique_391769508">infocenter.nordicsemi.com/.../pmu_oscillators.html</a></p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>