Hi Alan,

It (8.3.5) is one of the cases can be dealt with, and now it is not detail defined yet. Can you describe what your practical purpose for S/NS interactive is so that we could collect feedbacks to check if the rules are applicable?

/Ken

From: TF-M <tf-m-bounces@lists.trustedfirmware.org> On Behalf Of DeMars, Alan via TF-M
Sent: Wednesday, March 4, 2020 10:51 PM
To: 'tf-m@lists.trustedfirmware.org' <tf-m@lists.trustedfirmware.org>
Subject: [TF-M] SPM_IDLE

Mention is made to “SPM_IDLE” in the Cooperative Scheduling Rules document:

https://ci.trustedfirmware.org/job/tf-m-build-test-nightly/lastSuccessfulBuild/artifact/build-docs/tf-m_documents/install/doc/user_guide/html/docs/design_documents/tfm_cooperative_scheduling_rules.html

I’m struggling to understand section 8.3.5 which references SPM_IDLE but doesn’t really define it. Is there more info on this topic? It appears to be a proposed solution for allowing other NS threads to be scheduled while the current NS thread is waiting for an asynchronous event in the secure service it has called.

Alan