which security features must uses the internal SRTC in imx6ul or imx6ull?

[changbaoma]

Hi, all

    It makes me really confuse for this post: Q&A: Can i.MX6Q Security use external RTC? 

    Can any one tell me exactly which security features must uses the internal SRTC in imx6ul or imx6ull?

Best Regards，

[jamesbone]

I am going to try to keep it simple,  if you application requires a Security Feature, do not use, an external RTC.

[changbaoma]

Hi， jamesbone

   Can you give me the reason？ as i can't find any description in the IMX6ULL RM & SRM.

[jamesbone · Accepted solution]

In the Internal Architecture of the Security Features the SRTC it is an input signal for example for the RGNA ( Random Generator Number)  I cannot provide more details since the security features are under NDA.  If you want more details you can ask for an NDA, and request the security Reference Manual of the i.MX6ULL.