Hi,

I assume the main purpose of isolation would be protect the code been seen by the AppRoT. Let’s check with the FF author for detailed answers.

The building instructions now is just create separate libraries and finally combine them together – since vendors can create Secure Partitions, these modularized building can’t be avoided.

/Ken

From: TF-M <tf-m-bounces@lists.trustedfirmware.org> On Behalf Of Reinhard Keil via TF-M
Sent: Thursday, January 9, 2020 4:00 PM
To: tf-m@lists.trustedfirmware.org
Subject: [TF-M] Code Protection between secure services

I suggest we review the requirement of code isolation on the secure side.

R/W data and R/O data should definitely be isolated, but code isolation has implications:

• Code cannot be share between services (i.e. no linker optimization to reduce memory footprint)
• Sharing library code
• Overall the build instructions of the system are more complicated
• Adding device specific driver code (i.e. to crypto) can become tricky

Reinhard

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