TrustZone

Arm TrustZone Technology

Arm TrustZone technology offers an efficient, system-wide approach to security with hardware-enforced isolation built into the CPU. It provides the perfect starting point for establishing a device root of trust based on Platform Security Architecture (PSA) guidelines.

The family of TrustZone technologies can be integrated into any Arm Cortex-A processor or processor based on the Armv7-A and Armv8-A architecture, and Cortex-M processors built on the Armv8-M architecture.

TrustZone for Cortex-A

TrustZone is used on billions of application processors to protect high-value code and data for diverse use cases including authentication, payment, content protection and enterprise. On application processors, TrustZone is frequently used to provide a security boundary for a GlobalPlatform Trusted Execution Environment.

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TrustZone for Cortex-M

The Armv8-M architecture extends TrustZone to Cortex-M, enabling robust levels of protection. TrustZone for Armv8-M has the same high-level features as TrustZone on application processors, with the key benefit that switching between Secure and Non-secure worlds is done in hardware for faster transitions and improved power efficiency.

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TrustZone for Armv8-A vs. TrustZone for Armv8-M

Feature/Architecture	TrustZone for Armv8-A	TrustZone for Armv8-M
Additional security states	SEL0 - Trusted Apps SEL1 - Trusted OS EL3 - Trusted Boot and Firmware (Armv8-A)	Secure thread - Trusted code/data Secure handler - Trusted device drivers, RTOS, Library managers...
Secure interrupts	Yes	Yes (Fast)
State transition (Boundary crossing)	Software transition	Hardware transition (Fast)
Memory management	Virtual memory MMU with secure attributes	Secure Attribution Unit (SAU) and MPU memory partitions
System interconnect security	Yes	Yes
Secure code, data and memory	Yes	Yes
Trusted boot	Yes	Yes
Software	Trusted Firmware-A (and third-party TEEs)	Arm Keil MDK, CMSIS, Arm Mbed OS, Trusted Firmware-M and third-party software

Community Blogs

Sparking potential for community development: Arm Education Kits now…

University Program materials are now even easier to access via GitHub. Use our resources, tools and more to spark the potential of your students.

yesterday by Dipesh Patel

Creating the Morello Technology Demonstrator

The goal for Arm’s Morello program has been to develop an experimental hardware technology demonstrator, in around two and half years.

5 days ago by Mark Inskip

Software enablement and the Morello Technology Demonstrator

Arm's software contributions to Morello target various of open-source projects. This series of integrated software stacks target the Morello board and Morello Platform Model (FVP).

5 days ago by Mark Nicholson

Vela Complier: The first step to deploy your NN model on the Arm Ethos-U mi

As first step to deploy your NN model on Ethos-U, Vela Complier is open-source and easy-use. Try it out and embrace the improvement of ML ability brought by Ethos-U to embedded system.

7 days ago by Liliya Wu

Works on Arm welcomes a new Community Hardware Program

miniNodes is proud to host and manage the brand new Arm Community Developer Hardware Program with the goal of providing individual developers access to single board computers from an array of vendors.

10 days ago by fixxxer

Optimize a ML model for fast inference on Ethos-U microNPU

This blog post explains how to optimize a trained deep neural network model to run on Ethos-U55 and Ethos-U65.

13 days ago by Elham Harirpoush

Community Forums

Answered	Keil MDK 5 – useful links that help getting started	2598 views	3 replies	Latest 1 months ago by rkopsch	Answer this
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Answered	Where should I ask my question? ARM Community	11749 views	5 replies	Latest 8 months ago by Andy Neil	Answer this

Answered	Keil MDK 5 – useful links that help getting started Latest 1 months ago by rkopsch	3 replies 2598 views
Answered	Forum FAQs Latest 3 months ago by Oliver Beirne	1 replies 1600 views
Answered	Forum FAQs Latest 3 months ago by Oliver Beirne	1 replies 1339 views
Answered	Forum FAQs Latest 3 months ago by Oliver Beirne	1 replies 2374 views
Answered	Forum FAQs Latest 3 months ago by Oliver Beirne	1 replies 1243 views
Answered	Where should I ask my question? Latest 8 months ago by Andy Neil	5 replies 11749 views

Compatible IP	Tools	Software
Cortex-A processors	Arm Development Studio	Trusted Firmware
Cortex-M55 processor	Arm Keil MDK software development tool	CMSIS-Pack
Cortex-M35P processor	Fast Models	Pelion IoT platform
Cortex-M33 processor		Mbed OS
Cortex-M23 processor