[LITMUS^RT] Tegra3 DevKit finally available

[Glenn Elliott]

I believe the 5th core can be disabled by changing the settings of the CPU governors.  Another work around is disabling CPU hot-plugging. The 5th core may only be enabled when three of the four normal cores are offline.  Disabling hot plugging will prevent those cores from going offline because NVIDIA uses hot-plugging to "remove" them from the system.

-Glenn


On Oct 26, 2012, at 6:24 AM, Felipe Cerqueira <felipeqcerqueira at gmail.com> wrote:

> Hi Glenn,
> 
> We were planning to buy a CARMA DevKit here at MPI-SWS.
> The only problem about the NVidia Tegra 3 is that besides the 4
> processors in the chip, there is a 5-th energy-saving processor, which
> is automatically handled by the underlying hardware.
> I'm not sure, but I think the 5-th processor is invisible to the
> kernel, which would be a problem for normal schedulability
> experiments, for example.
> 
> I had sent an email for that SECO Company and they replied me with a
> Nvidia's white paper with simple details about the processors, but
> none about how to turn off the core.
> 
> Thanks,
> Felipe
> 
> 2012/10/26 Glenn Elliott <gelliott at cs.unc.edu>:
>> I thought those here would be interested to know that the CARMA DevKits are *finally* on sale: http://shop.seco.com/carma-devkit.html?___store=eu_en&___from_store=eu_en
>> 
>> It is an interesting platform because it looks like one can swap out the Tegra daughter board for other compatible ARM and x86 modules.
>> ARM modules: http://www.seco.com/en/itemlist/qseven/qseven-arm
>> x86 modules: http://www.seco.com/en/itemlist/qseven/qseven-x86
>> 
>> Not sure if the discrete GPU will still work without the Tegra though.
>> 
>> -Glenn
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