Re: Reading SPD on Intel Patsburg on Supermicro X9SRG-F board

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On Wed, Jan 29, 2014 at 05:12:48PM -0800, Alun Evans wrote:
> 
> On 29 Jan 2014, at 11:48, Alun Evans <alun@xxxxxxxxxxxxx> wrote:
> 
> > Thanks for the responses everyone, inline,
> > 
> > On 29 Jan 2014, at 10:25, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > 
> >> On Wed, Jan 29, 2014 at 05:42:24PM +0100, Jean Delvare wrote:
> >>> Hi Alun,
> >>> <snip>
> >> 
> >>> Please ask Supermicro about it.
> > 
> > I have put a request in… We’ll see if I get a response.
> > 
> >>> If the memory slots are behind an I2C
> >>> multiplexer, ask them if the multiplexer is I2C-based or GPIO-based. If
> >>> I2C-based, ask for the multiplexer type and address. If GPIO-based, ask
> >>> for the chip name and pin numbers for the GPIOs. In both case, please
> >>> ask which GPIO combinations map to which memory slots.
> 
> I inlined the above hunk with my question, and the first response was:
> 
> > Received feedback; The memory address does not use mux.  It is hardware defined by Intel.
> 
> So I went and clarified I was not talking about the DDR physical address setup by the memory reference code, and I got:
> 
> > Per our engineer; There is no hardware connecting to DIMM.
> 
> I’m not sure I’ve found the right help here...
> 
Actually you might have. On some HW the DIMMs are connceted to a separate
SMBus channel which is not visible to SW.

Guenter

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