Updating Process Secure-Boot (TF-A->OP-TEE->U-Boot)

[ajava]

Hello,

i use STM32mpu1-dk2 and want to implement an update over the air mechanism.

For that i would duplicate all partitions from fsbl to u-boot, that means

fsbl, teeh, teed, teep, u-boot.

Now i would like to know how one can tell TF-A which partion should be choosen for the next boot stage. That means, imagine we have 2 partioitns for OP-Tee and we have updated Op-TEE (teeh, teed teep), now we want fsbl to starts from the new updatetd OP-Tee partition.

Any Idea how can this goal be achieved using TF-A?

Thanks

[Christophe Guibout]

Hi @ajava​ ,

A proposition would to store at a dedicated address the value to use Op-tee A or B version.

You can create 6 partitions : teeh1, teed1, teep1, teeh2, teed2 and teep2.

According with the value that can also be updated by linux , tf-a will boot on A or B op-tee partitions.

BR,

Christophe