Unblow not locked fuses for feature NXP processors?

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Unblow not locked fuses for feature NXP processors?

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bmx666
Contributor II

Many people faces with problem on i.MX processors because not well qualified or they confused by documentation where you can set fuses and lock them later. Will be featured processor support this feature for unblow fuses, like SRK hashes, which will be programmed incorrectly or for development purpose?

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Maxim

unfortunately it is not possible to "unblow" fuses since

they are "one-time programmable" :

Programmable read-only memory - Wikipedia 

Best regards
igor
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bmx666
Contributor II

Hi Igor,

I asked about processors in the future which can support non-OTP like eMMC boot partition switch. It can be overwritten multiple times. But after locking this fuse it will be not possible anymore.

There is for me left only two questions between OTP and non-OTP:
1. Are there any security vulnerabilities?

2. Is it more expensive to implement?

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