Hi,
i've been trying to implement a secure-boot on an Ultrazed (AES-ZU3EGES-1-SK-G).
Without encryption, building the Boot-Image (containg a FSBL and a sample Hello World Programm) in SDK works fine in both QSPI and SD Mode.
The AES-Key is supposed to be stored in the BBRAM, which requires an external battery since there is no battery on the Carrier Card. So i bought a LR44 battery and connected in to the Board.
So the next step is the build an encrypted (only AES) Bootimage which also works fine, an AES-Key is automatically generated (i only have to provide the deivce name, which should be XCZU3EG). Using the Vivado hardware manager to program this AES-Key to BBRAM yields "Operation successful". But whenever i try to boot the encrypted image (via QSPI or SD) nothing happens and nothing is displayed on the Serial Connection (Tera Term).
I assume that there might a certain Jumper that has to be set in order to allow the power of the external battery to reach the BBRAM. Or there is any other mistake, so the BBRAM instantly looses the Key whenever I powercycle for reboot. I think this, because the Vivado Hardware Manager also yields "Operation successful" whenever there is no external battery at all connected. There might as well be any other mistake.
I tried to use a selfmade FSBL as well as the one which was premade on the SD-Card. In addition I tried to only encrypt one Partition of the Boot-Image (for example an unencrypted FSBL and an encrypted Hello-World-Programm combined to the Boot Image) but then again, nothing happens, not even the FSBL runs. At least there is nothing to see on the Serial-Connection.
Unfortunately there is only detailed Information about other Evalulations Boards and none for the AES-ZU3EGES-1-SK-G. Therefore I have been trying to adapt those as good as possible and wasn't able to find any errors.
Do you have any idea, would have have gone wrong?
Kind Regards
