https://devzone.nordicsemi.com/f/nordic-q-a/128216/zephyr-driver-regarding-the-execution-speed-of-flash-read-api-at-nrf54l15Hi, I&#39;m reading 1 byte of data from a Macronics MX25R64, but the execution speed of the read operation varies depending on the SDK version. With SDK 3.1.1, it&#39;s possible to read one byte of data in about 60us. SDK 3.2.4 reads one byte of data inen-USTelligent Community 13Fri, 22 May 2026 06:57:45 GMThttps://devzone.nordicsemi.com/thread/566741?ContentTypeID=1Fri, 22 May 2026 06:57:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81c226f6-854e-43c3-9706-910a56c9f2ebVidar Berg<p>Hello,</p> <p>Given the large discrepancy I suspect in the first case that the SPI flash is powered on, while with the new version it is in Deep power down (<a href="https://github.com/nrfconnect/sdk-zephyr/blob/98a344fe21a4439b0cd1d340635a6ccb3e166f46/drivers/flash/spi_nor.c#L201">DPD</a><span>)</span> mode thus requiring&nbsp;the driver to wait for the flash to become ready before it can perform&nbsp;the read operation. Perhaps you can disable DPD (I.e. remove the <span style="color:rgba(0, 0, 238, 1);"><span><u>has-did</u></span></span>&nbsp;property from the&nbsp;<span>MX25R64 DT node) to confirm if this improves the read performance.</span></p> <p><span>Best regards,</span></p> <p><span>Vidar</span></p><div style="clear:both;"></div>