Hello @vix,
The response from the @ToradexAI is pretty much on point here.
The pin for GPIO1_IO05 has a Pull-up reset state, as you can see from Table 17: SoC Pins Mapping from the Verdin iMX8MP datasheet:
Therefore, if you want to ensure this pin remains low early in the boot process, you will need to configure this either in the ATF or in the u-boot board file for the Verdin iMX8MP.
It would be simpler to try first in u-boot and see if this is enough for your application, and, if not, go to the ATF.
An example of an early GPIO configuration in u-boot for another board can be found here: Colibri IMX6ULL SODIMM_99 pin issues in u-boot - #6 by bruno.tx
Best Regards,
Bruno Mello