[TZ_VMM] - libpng on the i.MX53 QSB

[Tiago Brito]

Thanks for the advice Christian!

2016-06-02 13:16 GMT+01:00 Christian Helmuth <
christian.helmuth at ...1...>:

> Hello Tiago,
>
> On Wed, Jun 01, 2016 at 12:50:33PM +0100, Tiago Brito wrote:
> > Thanks Stefan, I did what you say and it compiled without any problem,
> but
> > I still cannot run the example.
> > I changed the tz_vmm run script like so:
> >     set boot_modules { core init ld.lib.so libc.lib.so zlib.lib.so
> > libpng.lib.so tz_vmm linux }
>
> Any practical issues aside I doubt that linking all your aspired
> functionality to tz_vmm is the proper approach. Genode is a component
> framework and access rights of components follow the principle of
> least authority. The task of tz_vmm is controlling the execution of
> the Linux VM and providing required device emulation. Trusted
> functions beyond this task (e.g., processing of PNG images) should be
> placed in distinct components. Then, the tz_vmm can use these
> components via dedicated inter-component interfaces by RPC, shared
> memory, and signals.
>
> A positive side effect of this approach is that you may develop,
> debug, and test your PNG processor independently from tz_vmm (or even
> i.MX53) given a small mockup environemnt is prepared.
>
> Greets
> --
> Christian Helmuth
> Genode Labs
>
> http://www.genode-labs.com/ · http://genode.org/
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