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Observer nrubeli
Observer
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Registered: ‎10-24-2019

re-keying eFUSE #PPK

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Dear community,

On my ZC702 I successfully programmed the hash of the PPK into the eFUSE array and set the RSA Auth bit. I am able to execute signed SW - all good.

My question: Is it possible to re-programm the eFUSE registers containing the PPK hash or is it like the rest of the eFUSE array OTP? I don't wanna try it in case it could flip some 0s to 1s and mess up my valid hash.

Thanks in advance

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Xilinx Employee
Xilinx Employee
132 Views
Registered: ‎10-11-2011

Re: re-keying eFUSE #PPK

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The eFUSEs only go from 0 to 1 and NOT viceversa. You should NOT try to re-program a new PPK on top of another one.

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Xilinx Employee
Xilinx Employee
133 Views
Registered: ‎10-11-2011

Re: re-keying eFUSE #PPK

Jump to solution

The eFUSEs only go from 0 to 1 and NOT viceversa. You should NOT try to re-program a new PPK on top of another one.

-------------------------------------------------------------------------
Don’t forget to reply, kudo, and accept as solution.
-------------------------------------------------------------------------

View solution in original post