RT116x/7x execution of unencrypted code after ENCRYPT_XIP_EN is enabled

[stephenschwartz]

Hello,

We have OTFAD1 set up to decrypt code from NOR flash connected to FlexSPI1 on the RT1165. Is it possible to temporarily disable encryption such that we could jump to a different region of NOR flash and execute unencrypted (plaintext) code?

Thanks,

Steve Schwartz-Fenwick

[jeremyzhou · Accepted solution]

Hi，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) Is it possible to temporarily disable encryption such that we could jump to a different region of NOR flash and execute unencrypted (plaintext) code?
-- After the ENCRYPT_XIP_EN fuse bit is blown, the ROM will boot the encrypted XiP image via the OTFAD, however, OTFAD allows the developers to set up 4 encrypted code areas into the application image, so the application image contains some plain code.

Hope this is clear.
Have a great day,
TIC

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