Re: [PATCH 1/5] hwmon: (coretemp) Drop dependency on PCI for TjMax detection on Atom CPUs

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On Wed, 10 Oct 2012 11:13:19 -0700, Guenter Roeck wrote:
> On Wed, Oct 10, 2012 at 07:00:39AM -0700, Guenter Roeck wrote:
> > On Wed, Oct 10, 2012 at 03:44:56PM +0200, Jean Delvare wrote:
> > [ ... ]
> > > 
> > > Documentation/hwmon/coretemp says 125°C for Atom 230 and 330. N5xx
> > > aren't listed in this document BTW.
> > > 
> > Reminds me ... we have a discrepancy in the code regarding the 230, and use 100
> > degrees C instead of 125 for it. Any idea where this is documented ?

The 125°C TjMax for the Atom 230 was documented by Chen Gong in
f3cffe4d (August 2010.)

> > I wasn't
> > able to find definite numbers over the weekend, and I don't recall why I used
> > 100 for the 230 when I introduced tjmax_table.

I think we simply never bothered special-casing the Atom 230/330. I
suppose they can't be detected by CPUID so we would need string name
matching.

> Followup on this after some more digging. Datasheets actually claim Tjmax for
> both 230 and 330 to be 90 degrees C. 125 degrees C is the shutdown temperature,
> which is different (the N4xx/D4xx/D5xx also have a shutdown temperature of 125
> degrees C). We do know that we have to use Tjmax of 125 C for the 330 for somewhat
> reasonable temperature readings. So the big remaining question is which
> temperature is used as calibration point for the 230.

I don't know, sorry. My parents do have an Atom 230-based system
though, I can take a look next time I visit them if you want.

-- 
Jean Delvare

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