Key Revocation - 2022.1 English

Versal ACAP System Software Developers Guide (UG1304)

Document ID
Release Date
2022.1 English

In eFUSEs, you have only three PPK choices to store the hash value of the primary public key and up to two of those values can be revoked. If another revocation occurs, the device is no longer bootable. If a PPK is compromised, you can revoke the public key by setting the corresponding PPK revocation bit in eFUSEs.

To revoke an SPK, you program the corresponding eFUSE bit in the revocation ID. There are 256-bits [0-255] in total, so you can revoke the SPK up to 255 times. Another revocation will result in a device that will no longer be bootable. The 0-bit of the revocation ID represents SPK 0, the 32nd bit of the revocation ID represents SPK 32, etc.