Hello Francisco,
For creating custom BSP, the most crucial step is to select correct baseline BSP to clone from. The idea is to start with a BSP for a chip that is the most similar to the custom one.
For the MK22FN1M0VLQ12 I suggest to use the FRDMK22F120M BSP as base.
You can change the PSP in order to create a new unique CPU ID.
Please check the below thread, I hope this helps!!
Creating MQX 4.0 BSP for K10
Have a great day,
Sol
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