hidden IC2 bus on ASUS

Eric W. Biederman ebiederman at lnxi.com
Tue Jun 24 11:04:07 CEST 2003

I am bouncing this to the LinuxBIOS list because most of the
discusion happens there.  And I am extremely busy at the moment.

Rudolf Marek <MAREKR2 at cs.felk.cvut.cz> writes:

> Hello,
> I have ASUS A7S333 (Sis745).
> On I2C I got only one winbond chip and one unknown device. 
> No SPD eeprom no PLL.
> I read somewhere that you are curios to know if other ASUS mainboards
> got this feature. So here is my answer.
> I want to enable the SPD i2c in case I can read the SPD timings.
> (I wrote i2c driver patch for my 745 into lm_sensors, ten to my surprise
> theese SPD and PLL devices "missing")
> Unfortunatelly I dont have SiS745 spec so I dont know where to trigger
> this back. Would you give me some hint please?

The only hint I have is that boards like this tend to have a mux
on the i2c line.  Either controlled by a gpio line.  Or I have seen
the controlled by an i2c device.

> Thank you.
> Rudolf Marek
> CTU prague student.



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