A new risk, if the chip is locked by KEY, then the board is worthless unless you know the key, it have no second-hand value like GPU
The key doesn't prevent unencrypted designs from running. Keep in mind, if we didn't do this it would also open an attack vector where a developer could maliciously burn the efuse preventing any designs from operating but their own.
I'm pretty sure you were already told this on discord?
no, i did not talk on discord, i review it. also i found the pdf,xapp1267,eFuse is OTP,it can lock the chip to a key.
CAUTION! If this bit is programmed to 1, the device cannot be
used unless the AES key is known. Return material
authorization (RMA) returns cannot be accepted and the
Vivado Indirect SPI/BPI flash programming flow cannot be
used if this bit is programmed. You must have external
configuration memories programmed BEFORE you blow this
fuse if you intend to use Vivado for this programming.
why not use the RAM to store the key?