[TF-A] Debugging a lock-up in opteed_system_reset

Hi all,

I'm currently debugging sporadic lockups in TF-A when calling the system reset hook of OP-TEE: opteed_system_reset() gets stuck on opteed_synchronous_sp_entry(), and the thread_system_reset_handler of OP-TEE is not invoked (I left a debug output on the OP-TEE side). Platform is k3, target hardware our IOT2050 device. I was using today's master of TF-A and OP-TEE, but also older versions of both.

What could cause this? I would assume that TF-A and OP-TEE are protected against overwriting of the non-secure world and we would see exceptions in case some reservation is not properly set, possibly misleading Linux.

Jan