TDA4VH: Reading fuses at runtime (KeyRev, MSV)

Shabnam,

Reading efuses during runtime needs to be done using TISCI APIs which are documented here:

Chapter 2: TISCI Message Documentation — TISCI User Guide

Chapter 6: Topic User Guides — TISCI User Guide

Hope this helps.

Thanks and Regards,

Rahul Prabhu 

PS: There is MCU+ SDK bare-metal example to read KEY_REV here that you can reuse on TDA4VH/AM69:

runtime_keyrev.c

Hi Shabnam,

Shabnam Ab said:

A concrete use case is a runtime check to determine whether the device has been provisioned.

This would translate to checking if the device has been converted to HS-SE or not. And this can be simple done using a register read.

Please see the following FAQs that are of relevance:

1. TDA4VM: How to check device type (GP/HS-FS/HS-SE) ?

2. Reference code to update keyrev using OPTEE

Please note that if a TI-SCI message is marked as Secure Queue only, then you need to invoke that message from a Secure-world like OPTEE OS. The second FAQ above shows a mechanism to update the KEYREV to switch the keys from SMPK/SMEK pair to BMPK/BMEK pair.

You can leverage similar infrastructure if you need to invoke any secure TI-SCI messages from the A72 side. 

regards

Suman