Secure partition to partition calls are not permitted while TF-M is initializing.
Current implementation of TF-M Core doesn't enforce formal checks during runtime partition init for this particular scenario, resulting in an unexpected error scenario.
The aim of this change is to detect such condition during the partition init phase at runtime (i.e. calls to partition init functions) and to be able to mark this as an error and treat it with the appropriate error flow handling.
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https://review.trustedfirmware.org/#/c/191/ is a proposed resolution for this change.