Re: Access to Arm Trusted Firmware

Hi Stefan,

On [09-07-2020 22:37], Stefan Kalkowski wrote:
> Dear l4-hackers,
> 
> I've seen that Fiasco.OC provides support for the i.MX8 SoC universe.
> I'm curious about whether the kernel provides any means to access the
> ARM Trusted Firmware (ATF) in general? (especially regarding the
> vendor-specific calls for powering different peripheral domains). I've
> seen some kind of platform control privilege for cpu powering if I
> understood it correctly. Is there something more generic available?

Fiasco.OC uses the PSCI interface to boot secondary cores. Via the platform
control capability it is possible for a userspace component to trigger system
shutdown and reset. I am not a 100% sure about suspend / resume.

Apart from that there is no further support or usage in the kernel.

Accessing other ATF services should be done in userspace I would say. Maybe
you can help me to understand what your platform driver is supposed to do?

Regards,
Matthias.

> I'm asking, because right now I write a platform driver for Genode
> running on the i.MX 8M with focus on the base-hw kernel. But if
> there is a way I would like to support Fiasco.OC as well.
> 
> Thank you in advance for any clearing up & best regards
> Stefan
> 
> -- 
> Stefan Kalkowski
> Genode labs
> 
> https://github.com/skalk | https://genode.org
> 
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