Re: Geode GX1 + RT-Preempt + ACPI

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Hi Alessio,

On Tue, 2007-05-15 at 13:32 +0200, Alessio Igor Bogani wrote:
> Hi Peter,
> 
> On Tue, 2007-05-15 at 13:26 +0200, Peter Feuerer wrote:
> [...]
> > > First of all, running a realtime OS on such a machine is no good idea, as it 
> > > is full of system management software that steals you the CPU.
> > 
> > What do you mean by "system management software"? The only software
> > running on my gx1 hardware is my linux system with kernel 2.6.18 using
> > rt preempt patch and compiled for x86.
> 
> This type of software is implemented into BIOS.

I see. Thanks for this information, that's realy annoying!

> [...]
> > I tried this for rt-preempt patched kernels > 2.6.18 (where acpi is
> > needed for the highres timer) but still no hard realtime capability.
> 
> I'm trying 2.6.21-rt1 and it _seems_ works (not tested yet).

The kernel itself was booting up, and running fine, but cyclictest and
my little square wave example
(http://rt.wiki.kernel.org/index.php/Squarewave-example) were not able
to achieve stable timings.

--peter

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