Hi Reiner Fauser ,
Please check the following picture about the FlexSPI:



So, I think you can try to use the official SDK code, then use the MCUXPresso IDE to open the flashspi_nor_polling project, in the project, you can open the config tool, you will find the FLEXSPI pin is avaiable.
Wish it helps you!
If you still have question about it, please kindly let me know.
Have a great day,
Kerry
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