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

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

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Contributor III

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

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Contributor III

Thanks Yuri for the quick clarification!

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NXP TechSupport
NXP TechSupport

@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.

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Contributor III

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?

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NXP TechSupport
NXP TechSupport

@sikumar3 

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

No.

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Contributor III

Thanks Yuri for the quick clarification!

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