OTFAD1/2_KEY_SEL_LOCK fuses for encrypted XiP with OTFAD

[vishnusudhankj]

HI,

By reading i.MX RT1170 Secure Boot Modes (AN13250.pdf) document, Under section 2.4.8, Fuse list for encrypted XiP with OTFAD.

 Shown OTFAD method has 2 OTFAD keys , OTFAD1 Key & OTFAD2 Key as shown in below image ,  

But in SPT , can able to see only OTFAD KEK & only one scramble key for all region(common for all). Where can i find the details for OTFAD1 key & OTFAD 2 key. What does it refers? kindly suggest.

Also, is there any performance document available for IEE encryption method?

[jay_heng · Accepted solution]

OTFAD1 is used for FlexSPI1

OTFAD2 is used for FlexSPI2.

We can only enable one FlexSPI device once in SPT, the OTFAD configuration is determined by FlexSPI instance, that is why we cannot set both OTFAD1 and OTFAD2 key in SPT at the same time.

[vishnusudhankj]

Is there any sample MCU IDE sample program available for IEE performance? or any document available for OTFAD vs IEE performance comparison? 

[jay_heng]

There is \SDK_2.11.1_MIMXRT1170-EVK\boards\evkmimxrt1170\demo_apps\iee_apc demo.

[vishnusudhankj]

@jay_heng thanks for your support

I need few clarity on the XiP encryption method,

Is it possible where can I refer which method is preferable either otfad or iee?  Which is having better performance? 

[jay_heng]

IEE and OTFAD are different IP and SoC arch, they have own usage scenario, we should not simply compare them.

For XIP encrypted boot, OTFAD is better than IEE.

[vishnusudhankj]

@jay_heng 

Is it possible . please suggest on what basis OTFAD is better ?

[vishnusudhankj]

Thanks for your support