[lm-sensors] [PATCH] hwmon (c7temp): new driver for VIA C7 CPU

Juerg Haefliger juergh at gmail.com
Mon Sep 29 16:58:37 CEST 2008

Hi Forest,

Well the bottom line is that the value returned in the EAX register
(0xC000002) is zero for all of these cases where people report 0 C CPU
temp. I haven't had the time yet to figure out what is different about
these CPUs and why they don't seem to adhere to the spec that I have.
One possibility is that my spec is old and things changed in the
meantime and another one is that the BIOS disables the thermal diodes
in the CPU. I have some sample BIOS code from VIA which does that but
I haven't had the time yet to figure out if that applies in this case.


On Sat, Sep 27, 2008 at 1:57 PM, Forest Bond <forest at alittletooquiet.net> wrote:
> Hi Juerg,
> On Sun, Sep 07, 2008 at 11:32:17AM -0700, Juerg Haefliger wrote:
>> On Fri, Sep 5, 2008 at 11:45 AM, Forest Bond <forest at alittletooquiet.net> wrote:
>>> On Thu, Jul 10, 2008 at 08:08:16AM +0200, Wilken Gottwalt wrote:
>>>> Am Montag 07 Juli 2008 19:29:00 schrieb Juerg Haefliger:
>>>>>> Am Montag 07 Juli 2008 08:11:02 schrieb Juerg Haefliger:
>>>>>>>> It's the Artigo-Box from Via with a PX10000 board
>>>>>>>> (http://www.via.com.tw/en/products/embedded/artigo/).
>>>>>>>> No, there are no bios settings dealing with thermal or power
>>>>>>>> management. There is nothing I can play with. The bios is very
>>>>>>>> rudimentary.
> [...]
>>>>> I'll try to get some answers from VIA but I'm out of ideas. Looks like
>>>>> your CPU doesn't have those thermal sensors.
>>>> This is weird, it's a plain C7.
>>> Anybody get anywhere with this?  I'm trying to get some useful data out of the
>>> Pico-ITX boards as well.
>> Yes I did receive some information from VIA but I haven't had a chance
>> yet to fully digest it. From the quick glance that I took, it looks
>> like there are different C7 models and the thermal sensors are
>> disabled depending on the model. VIA provided some sample BIOS code
>> but I need to take a closer look to fully understand it. More later.
> Just following up.  Anything new to report here?  Can I do anything to help get
> this moving?
> Thanks,
> Forest
> --
> Forest Bond
> http://www.alittletooquiet.net
> http://www.pytagsfs.org
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