imx53 trustzone boot (Freescale iMX53-QSB)

[Stefan Kalkowski]

Hi Ofer,

On 03/29/2015 09:04 AM, Ofer Hasson wrote:
> Hello,
> 
> I'm currently exploring arm trustzone with genode, I managed to run the
> example and run my own normal world linux kernel.
> 
> Is there a way to chain load normal world operating system, load another
> u-boot file in the normal world ? is there a technical problem doing so ?

In general this is possible. However, as TrustZone is _no_
virtualization solution, it is not transparent to the non-secure guest
that it runs in the "normal world". So it is likely that you need to
first modify u-boot so it runs smoothly in the normal world. For
instance you have to check that it does not touch memory it does not
own, as well as devices. Moreover, u-boot should not try to access
system registers (coprocessor 15) that are TrustZone sensitive, like SCR
register.

Regards
Stefan

> 
> Any input no the subject will be very helpful.
> 
> Thanks
> 
> 
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-- 
Stefan Kalkowski
Genode Labs

http://www.genode-labs.com/ · http://genode.org/