https://devzone.nordicsemi.com/f/nordic-q-a/127943/sd-card-communication-on-nrf54lm20a-high-speed-spim-bus-spi00-fails-to-initializeGood day, I have been making use of the nRF54LM20A SoC with ncs v3.2.0. I am currently trying to use the high-speed SPI (SPIM00) lines on Port 2 to communicate with an SD card. I intend to mount it and be able to write to and read from the card. I amen-USTelligent Community 13Mon, 04 May 2026 06:45:24 GMThttps://devzone.nordicsemi.com/thread/565800?ContentTypeID=1Mon, 04 May 2026 06:45:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:14f597a7-a0e4-4c5f-8324-0d66f3807a13Susheel Nuguru<p>Sorry for late reply Damola,&nbsp;</p> <p>As you have already calculated, SPI00 has minimal speed of around 1 MHz due to its prescalar so requesting 400KHz with this instance is not possible directly with the Zephyr&#39;s layer. The options are either to</p> <ul> <li>move the SD card wiring to Port 1 and use SPIM20/21/22</li> <li>Stay on Port 2, use spi-bitbang only,&nbsp;<strong></strong></li> </ul> <p>You can technically manually init SD over GPIO bit bang and then use SPIM00 transfers but it is a bit chaotic and risky to do so. A lot of things can go wrong.</p><div style="clear:both;"></div>