Re: [LinuxBIOS] what is i2cmux2?

[Lu, Yinghai]

That is MB related.

So normally you don't need i2cmux for 2 way opteron's RAM spd access.

The i2c mux has two bits for one link
First for: in/out, second is enabling which link.

YH

-----Original Message-----
From: [e-mail]
[mailto:[e-mail]] On Behalf Of Tom Sylla
Sent: Monday, November 13, 2006 1:01 PM
To: yhlu; [e-mail]
Subject: [LinuxBIOS] what is i2cmux2?

As part of Broadcom Blast, yhlu checked in a new i2c mux file,
i2cmux2. I see a one line addition:

smbus_write_byte(dev, 0x03, 0); // all output

What is this for? Is required for the HT1000? or is it required for
the particular mux on the Blast platform? Can that answer be
documented somewhere? Is there a better way to do this than to
duplicate and stick on a '2'?

Thanks

[LinuxBIOS] what is i2cmux2?

[ron minnich]

On 11/13/06, Lu, Yinghai  wrote:
> That is MB related.
>
> So normally you don't need i2cmux for 2 way opteron's RAM spd access.
>
> The i2c mux has two bits for one link
> First for: in/out, second is enabling which link.

these are increasingly common ...

ron