On 04/13/2011 10:39 AM, Jean Delvare wrote:
The challenge will be to detect which of the 8 supported devices (
pca_9540, pca_9542, pca_9543, pca_9544, pca_9545, pca_9546, pca_9547,
pca_9548) is actually to be used.
In Michael's case it is irrelevant anyway, as the information he found
meanwhile clearly indicates that bus multiplexing is achieved by GPIOs
(most certainly on the ICH10) and not an PCA954x chip. The chip at 0x70
is probably the Intel 5500 IOH.
Supermicro just gave me the following information:
To access all SPDs, you have to pull low GPIO49 (IO_0x528 bit 17) first.
Then pull low GPIO52 (IO_0x528 bit 20) to access first CPU
memory(0x50~0x55); pull high GPIO52 to access 2nd CPU memory(0x50~0x55).
I can't find anything about GPIO49/52,53 in Datasheet for 5500/5520 chipset
http://www.intel.com/assets/pdf/datasheet/321328.pdf
So it is probably connected to ICH10
http://www.intel.com/Assets/PDF/datasheet/319973.pdf
but I don't know how to use this information
Regards,
Michael!
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