https://devzone.nordicsemi.com/f/nordic-q-a/127383/qspi-flash-failure-on-nrf5340-when-cpu-runs-at-128-mhzHi nordic team I am working with the Nordic nRF5340 SoC using Zephyr RTOS . Hardware External QSPI flash: MX25R6435F QSPI configuration (DeviceTree): &amp;qspi { status = &quot;okay&quot; ; pinctrl-0 = &lt;&amp;qspi_default&gt;; pinctrl-1 = &lt;&amp;qspi_sleepen-USTelligent Community 13Wed, 11 Mar 2026 13:40:06 GMThttps://devzone.nordicsemi.com/thread/563036?ContentTypeID=1Wed, 11 Mar 2026 13:40:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e4c9af28-a337-429f-9d21-4e2ff0af9f69PaKa<p>The link goes to a HW errata for the device so this is a HW limitation and not caused by SW.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/563035?ContentTypeID=1Wed, 11 Mar 2026 13:38:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cb974a44-85da-4255-8a83-f2debb768e11G vandana<p>Is &quot; <span>QSPI can only be used with CPU frequency at 64MHz.&quot;&nbsp;</span>this a limitation of the Zephyr QSPI driver implementation, or a limitation of the Nordic QSPI driver?&rdquo;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/563022?ContentTypeID=1Wed, 11 Mar 2026 12:54:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:362b29cc-164b-482a-bb66-49751659a053PaKa<p>Did you check out:&nbsp;<a href="https://docs.nordicsemi.com/bundle/errata_nRF5340_Rev1/page/ERR/nRF5340/Rev1/latest/anomaly_340_159.html#anomaly_340_159?">https://docs.nordicsemi.com/bundle/errata_nRF5340_Rev1/page/ERR/nRF5340/Rev1/latest/anomaly_340_159.html#anomaly_340_159?</a>&nbsp;QSPI can only be used with CPU frequency at 64MHz.</p><div style="clear:both;"></div>