Hi Poppy,

For IPC Model, the initializations of Secure Partitions (entry_point) are also subject to scheduling. In your example, when ps_init() calls crypto services it will be blocked and SPM emit a signal to Crypto and triggers scheduler (This is the same behavior as when a SP calls any service after initialization.) Let's assume the Crypto Partition has not been initialized. Then when the Crypto Partition is scheduled to run (it is not guaranteed this happens right after ps_init() calls Crypto services), it will initialize first and then start to handle signals (see the entry_point function). The request from ps_init() then will be handled.

For Library Model, I think initialization happens when the first time any service is called.

Best Regards, Kevin

From: TF-M tf-m-bounces@lists.trustedfirmware.org On Behalf Of Edward Yang via TF-M Sent: Friday, July 30, 2021 11:43 AM To: tf-m@lists.trustedfirmware.org Subject: [TF-M] question about the init sequence of tf-m secure partitions

Hi experts,

I want to know how to define the init sequence of secure partitions in tf-m. For example, PS partition may have dependency on crypto service, if PS_ENCRYPTION defined ,ps_init() needs calling crypto services, so I think crypto_init()should be done before ps_init().

Best Regards, Poppy Wu

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