topic Re: imx6ULL HAB keys in i.MX Processors

imx6ULL HAB keys

parthitce — Tue, 29 Oct 2019 13:49:00 GMT

Hello Yuri,

Thanks for sharing that ERRATA details. I will check it. Unfortunately I am already using Engine = SW, this ERRATA should not affect my case.

I have another question here,
- Will it be possible to change the HAB keys? For example, I have fused a keys in bank 3 words 0 - 7 and found it isn't working and I want to change to new keys.

Or the fuses always one time programmable for bank 3 words 0 - 7?

In my case, I tried changing it couple of times with different keys and now I am not able to read the keys which I write into it at all using "fuse read". I also noticed that "fuse override" just overrides the shadow registers for testing purpose, but not change the real fuse.

Thanks in advance,

Parthiban N

Re: imx6ULL HAB keys

Yuri — Wed, 30 Oct 2019 04:56:53 GMT

Hello,

The i.MX fuses can be burned once.

But customers can use the revoke feature, described in Appendix B

(SRK revocation on i.MX 6 & 7 series) of "Secure Boot on i.MX 50, i.MX 53,

i.MX 6 and i.MX 7 Series using HABv4" Application Note, Rev. 2, 05/2018

https://www.nxp.com/docs/en/application-note/AN4581.pdf

Have a great day,

Yuri

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