linux-kernel - Re: Identifying Intel Atom Z500PT

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Date:	Wed, 08 Apr 2009 19:46:11 +0200
From:	Michael Riepe <michael.riepe@...glemail.com>
To:	Robert Schwebel <r.schwebel@...gutronix.de>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	tglx@...utronix.de
Subject: Re: Identifying Intel Atom Z500PT

Hi!

Robert Schwebel wrote:
> Does anyone have an idea how to properly identify an Atom Z500PT cpu?
> The get_model_name() mechanics in arch/x86/kernel/cpu/common.c uses
> cpuid() to find out about the brand id, which is "Genuine Intel(R) CPU"
> with family 6 and model 28.

Family 6, model 28, stepping 2 seems to be common to all current Atoms
-- my 330 reports the same. There are some flags, however, that
currently only appear in the Z series, e.g. vmx is not available on the
230/330/N270. To differentiate between the latter, you could look for
64-bit support (which is missing in the N270) and the number of cores.
Besides that, the 230/330 models lack the speedstep feature.

I don't know if there's a way to distinguish a -P model from a -PT
model. But from a software point of view, they should be identical anyway.

> Below is the output of /proc/cpuinfo on that box:
> 
> root@...CORE:~ cat /proc/cpuinfo | grep model | head -n 2
> model           : 28
> model name      : Genuine Intel(R) CPU        @ 1.10GHz

Strange - the 330 reports:

model name      : Intel(R) Atom(TM) CPU  330   @ 1.60GHz

(running 2.6.29).

-- 
Michael "Tired" Riepe <michael.riepe@...glemail.com>
X-Tired: Each morning I get up I die a little
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