Hello Matej,
Is the procedure on how to encrypt the FLASH, set the key in RT1020 device described anywhere? The 'evkmimxrt1020_flashloader' does not contain any documentation, as far as I can see.
Yes, you need to request access to the security application note (link). This document contains the information that you are looking for.
I would also recommend you to take a look at the following tool that one of my co-workes made (link).
Is there any performance penalty when using an encrypted image?
According to our local testing with BEE on I.MXRT1020 there is a significant difference in performance Encrypted XIP and Normal XIP. Encrypted XIP is about 20-30% slower.
I-Cache or D-Cache together with FlexSPI prefetch buffer feature on can significantly help to reduce this Encrypted XIP performance dropout. In this case when Caches and FlexSPI prefetch buffer feature on there is no performance difference notable. But, of course, results with Caches on are code style dependent.
Have a great day,
TIC
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