Re: [lm-sensors] About the Asus F2A85 temperature sensor (it8603e)

Re: [lm-sensors] About the Asus F2A85 temperature sensor (it8603e)

[Rudolf Marek]

>

> P.S. I have reason to believe that the it87 device we are talking about is
> actually an emulation running on an 8051 co-processor, specifically the EC
> (Embedded Controller) in the AMD A85 Hudson chipset. The it87 emulation is
> poorly written in the 8051 code and can result in unexpected effects -- bugs.
> I have specifically seen the sensor stop updating (as if it just stopped
> sampling values).

No, the chip is real, just look to the corner near audio connectors ;) The chip 
is derivate of IT8728 it seems. It has lower pin count and lower number of 
features. There are just two input temperatures and 3 fan inputs/pwms. Voltages 
are all there. It looks like the voltages have fixed functions for inputs 
because they are also used in the voltage under/over voltage protections.

I'm tempted to treat this chip as IT8728F. Does anyone have a datasheet of IT8728F?

Thanks
Rudolf

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Re: [lm-sensors] About the Asus F2A85 temperature sensor (it8603e)

[David Hubbard]

On Thu, Nov 7, 2013 at 4:35 PM, Rudolf Marek <r.marek@assembler.cz> wrote:

>
>>
>  P.S. I have reason to believe that the it87 device we are talking about is
>> actually an emulation running on an 8051 co-processor, specifically the EC
>> (Embedded Controller) in the AMD A85 Hudson chipset. The it87 emulation is
>> poorly written in the 8051 code and can result in unexpected effects --
>> bugs.
>> I have specifically seen the sensor stop updating (as if it just stopped
>> sampling values).
>>
>
> No, the chip is real, just look to the corner near audio connectors ;) The
> chip is derivate of IT8728 it seems. It has lower pin count and lower
> number of features. There are just two input temperatures and 3 fan
> inputs/pwms. Voltages are all there. It looks like the voltages have fixed
> functions for inputs because they are also used in the voltage under/over
> voltage protections.
>
> I'm tempted to treat this chip as IT8728F. Does anyone have a datasheet of
> IT8728F?
>

That is a good idea. The current driver causes the chip to stop updating
temperatures, though fan control continues to work. That probably means a
different/additional exit sequence is needed -- or perhaps writing to the
chip is entirely wrong.

I'll look for an 8728 datasheet.

David
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Re: [lm-sensors] About the Asus F2A85 temperature sensor (it8603e)

[Rudolf Marek]

> That is a good idea. The current driver causes the chip to stop updating
> temperatures, though fan control continues to work. That probably means a
> different/additional exit sequence is needed -- or perhaps writing to the chip
> is entirely wrong.

Hm maybe we just hit some undefined register due to feature reduction. Does it 
happen with coreboot too? (You will have to enable the logical device, I think 
Im not doing that). How you know it is not updating? If you program own io 
routine to just read out temps, does it work?

I can check more stuff next week.

> I'll look for an 8728 datasheet

Looks I found something through google on ulozto.

Thanks
Rudolf


.
>
> David

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