Hi Christophe,
Until now, there are no plans of releasing a different evaluation board for i.MX6ULZ specific. It is supported on i.MX6ULL base board, just replacing the CPU board with the one of i.MX6ULZ processor.
Regarding software and porting guide, this document mentions the mayor considerations when migrating, so, as general guidelines, they should work with newer BSP releases, just considering the changes between BSP versions.
Hope this will be useful for you.
Best regards!
/Carlos
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