IMX6UL: Is it possible to fuse more than one SRK (public key)?

[sikumar3]

Hi,

We are planning to use two separate keys one for development nodes and another one for production nodes.

Is it possible to fuse more than one SRK?

Is it possible to add additional public key after the Fuse is closed?

Regards,

Siva

[Yuri]

@sikumar3 

Hello,

    All four SRKs (SRK table) should be flashed, since HAB evaluates the SRK table,
included in the signature, by hashing it and comparing the result to the SRK fuse
values.

Regards,
Yuri.

[sikumar3]

Hi Yuri,

Thanks for the response!

If only one SRK is fused and the fuse is closed, will I be able to add additional SRK in this scenario?

[Yuri]

@sikumar3 

> If only one SRK is fused and the fuse is closed, will I be able to add additional SRK in this scenario?

No.

[sikumar3 · Accepted solution]

Thanks Yuri for the quick clarification!