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Secure Boot: Can the fuses be written multiple times?

Question asked by Tanjeff Moos on May 9, 2019
Latest reply on May 13, 2019 by bpe

I'm implementing Secure Boot on the QorIQ T1023 SoC. I have to write  the hash of the pubkey into the fuse box.

 

Is it possible to prototype secure boot with a "temporary" pubkey and to change the pubkey hash later on? I.e. can I write the pubkey hash to the fuse box multiple times?

 

There is a "Write Protect" bit (SFP_OSPR.WP) which suggest that it might be possible.

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