Memory Page Fault

[Christian Helmuth]

Hello Chris,

On Wed, May 30, 2018 at 12:11:03PM -0400, Chris Rothrock wrote:
> Working with our developers for SABLE, we branched a build of SABLE for one
> purpose - to NOT run the AMD skinit instruction before handing off boot to
> NOVA/Genode.  Using this build of SABLE we are able to get a successful
> boot to the demo.
> 
> At this stage, it seems that something fundamental changed within Genode
> and/or NOVA (and I have also seen this with Genode/seL4 demo) that causes
> the memory fault to occur on AMD platforms ONLY when the skinit instruction
> is performed prior to boot hand-off.  Is this a point where we can dig a
> little deeper to understand where this problem is occurring?

Your issue description suggests you have the perfect "git bisect"
situation: an old source-code revision where it seems to work and a
new revision that shows an issue. Therefore, I recommend you try to
narrow down the time frame where the issue appears first by testing
different revisions of Genode with a minimalistic scenario like "make
run/log".

>From our side I can't promise any practical contribution as the
current release works pretty stable on our test hardware (admittedly
Intel not AMD) and we don't have access to SABLE.

Regards
-- 
Christian Helmuth
Genode Labs

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