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Running TrustZone

Andreas Lauber
Note: This was originally posted on 4th January 2013 at http://forums.arm.com

Hallo,

I'm trying to run the TrustZone example from DS-5. And it's working with the RTSM-VE-A9x4. But this is just a simulation, isn't it. Because I do not have to power up DSTREAM and my board.
So I tried some more to run the example on the Xilinx Zynq board which has a ARM Cortex A9 DualCore.

BUT: If I'm using "Debug Cortex_A9_0 via DSTREAM/RVI" from Xilinx-Zynq-7000 EEP ZC702 its not working anymore. I used the connection with a hello world program before so it's defiantly the right connection. I also added

add-symbol-file "${workspace_loc:/TrustZone/normal.axf}" N:0

in execute debugger commands like it is in the RTSM version.
Nevertheless I get the following error if I want to debug the software on the ARM.

ERROR(CMD16-TAD11-NAL22):
! Failed to load "TrustZone-versatile.axf"
! Failed to write 4.872 bytes to address S:0x80000000
! General error on memory or register access.

I know the example was written for versatile express, but its also just a Cortex A9. So where is the difference? What did I forgot to change? I would be happy about some ideas.
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  • Note: This was originally posted on 8th January 2013 at http://forums.arm.com

    You need to modify the scatter files so that secure code/data is in secure memory, and non-secure code/data is in non-secure memory.

    Most the boards I have worked with have some permanently secure memory, and some memory which is run-time configurable as secure/non-secure.  With the default being secure, and controlled by a TrustZone Protection Controller (TZPC) or TrustZone Address Space Controller (TZASC) or a couple of cases some custom logic in the interconnect.  I don't know what the part you're using does.

    From memory, the Versatile board has a TZPC which gets configured by the example.  So if your board is similar you'll also have to modify that code to match your system.  Or you might be lucky, and have dedicated secure and non-secure RAM regions.  In which case just modify the scatter files and then rip out the TZPC code.
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  • Note: This was originally posted on 8th January 2013 at http://forums.arm.com

    You need to modify the scatter files so that secure code/data is in secure memory, and non-secure code/data is in non-secure memory.

    Most the boards I have worked with have some permanently secure memory, and some memory which is run-time configurable as secure/non-secure.  With the default being secure, and controlled by a TrustZone Protection Controller (TZPC) or TrustZone Address Space Controller (TZASC) or a couple of cases some custom logic in the interconnect.  I don't know what the part you're using does.

    From memory, the Versatile board has a TZPC which gets configured by the example.  So if your board is similar you'll also have to modify that code to match your system.  Or you might be lucky, and have dedicated secure and non-secure RAM regions.  In which case just modify the scatter files and then rip out the TZPC code.
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