Hi Iñigo,

We needs a little bit more information to know how best to answer your question. Is this just an academic question of is there a real use case you are trying to decide on which way to go?

Its not so much a question of which architecture is easier its just that they are different with Cortex-M powering the most energy-efficient embedded devices where as Cortex-A is offering supreme performance at optimal power. Each architecture offers different hardware constraints and the secure TrustZone is implemented to handle each and an ecosystem of solutions surrounds each.

If this is an academic question I would refer you to Arm's pages on TrustZone as a starting point: https://www.arm.com/why-arm/technologies/trustzone-for-cortex-m https://www.arm.com/why-arm/technologies/trustzone-for-cortex-a

If there is need for guidance on a specific solution or difficulties you are trying to overcome while building a solution please give us some more details.

Thanks

Joanna

On 22/01/2020, 08:07, "TF-A on behalf of Iñigo Vicente Waliño via TF-A" <tf-a-bounces@lists.trustedfirmware.org on behalf of tf-a@lists.trustedfirmware.org> wrote:

Hi,

Can someone explain to me why it is easier to implement a secure TrustZone environment with secure boot and storage and PSA certificate in cortex-M than in cortex-A?

Who better implements a safe environment: cortex-M or cortex-A? Why?

Thanks. -- TF-A mailing list TF-A@lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-a

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