https://devzone.nordicsemi.com/f/nordic-q-a/52777/nrf5840-custom-board-won-t-boot-on-power-onI have a custom board based on QIAA Reference Layout 1.1 Variant 6. The application is built with Zephyr without bootloader and is placed directly on address 0x0. When I compile the application for the nRF52840 USB-stick and run it on that board everythingen-USTelligent Community 13Mon, 07 Oct 2019 14:05:49 GMThttps://devzone.nordicsemi.com/thread/213696?ContentTypeID=1Mon, 07 Oct 2019 14:05:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b5754f41-1f9d-46c5-94f0-3291d8e17766mark.spanberg<p>I don&#39;t have the DCDC-coil&nbsp;on my board (nRF52840&nbsp;<span>QIAA Reference Layout 1.1 Variant 6</span>) so I guess enabling it could cause some trouble. Anyway it did&nbsp;solve the problem on my design.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/213548?ContentTypeID=1Mon, 07 Oct 2019 07:19:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:08967295-b551-453f-9f53-4d48fa37ede3Susheel Nuguru<p>Enabling the DCDC is normally when you are using peripherals that draw high current like RADIO.</p> <p>Just enabling the DCDC should not be the main reason for the behavior you are looking at.</p> <p>But does disabling the DCDC fix the problem for you? Can you give me more details on the power source that is connected to your board?&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/212918?ContentTypeID=1Wed, 02 Oct 2019 07:18:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b695d736-ed2d-469e-87aa-82c0bfd65e28mark.spanberg<p><span>Ok, so there might have been a &quot;</span><span>CONFIG_BOARD_ENABLE_DCDC=y&quot; that shouldn&#39;t be there in one of the millions of Zephyr config files.</span></p><div style="clear:both;"></div>