Configuration Update

Versal ACAP Technical Reference Manual (AM011)

Document ID
AM011
Release Date
2022-04-26
Revision
1.4 English

As it is with the A-HWRoT mode, configuration update is critical for enabling features such as over-the-air (OTA) update. The configuration update flow for S-HWRoT boot mode is no different than that of the A-HWRoT mode described in Figure 1. However, this flow does have an additional setup step if it is necessary to update the PLM or CDO. This step involves programming additional eFUSEs in the IV space. This step prevents a system from reusing the same AES key/IV pair for different data. Such reuse is a violation of the AES standard. All remaining partitions requiring an update are done so by creating new configuration images encrypted using a different key/IV pair and loaded via the PLM no differently than was previously done.