Intel Confirms "On Demand" Upgrades With Sapphire Rapids (Software Defined Silicon)

[coder]

They could go with fuses that permanently activate the functionality once they are blown. All your concerns would be handled by that.

I have not checked the public details, but are you sure that they used flash?

Based on what I recall from the kernel support patches, it involved various aspects of key management that sounded like it could involve dynamically adding & removing keys.

Even if it's PROM-based today, it could be flash-based tomorrow. I would need more assurances that keys can never be revoked, corrupted, or disabled by further keys, I very much doubt they will give such assurances.