Bootable image for imx8qxp

Hi

I currently try to create a bootable image of u-boot for the imx8qxp eval board. If I follow the instruction in I see the following output on the serial debug port:

U-Boot SPL 2020.10 (Oct 15 2020 - 15:54:37 +0200) Normal Boot Trying to boot from MMC2_2 Load image from MMC/SD 0x53800

And then nothing. So, it seems that SPL is running but the main u-boot can't be started. Can anyone out there give me a hint on how to get the board to the u-boot prompt?

BTW: I also tried the NXP provided u-boot (seems to be a modified 2020.04) with the same result. I also tried different combinations of SECO and SCFW versions. Always with the same result in hanging u-boot after SPL

Regards, Matthias