[LinuxBIOS] what is i2cmux2?

Lu, Yinghai yinghai.lu at amd.com
Mon Nov 13 22:12:31 CET 2006

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.


-----Original Message-----
From: linuxbios-bounces at linuxbios.org
[mailto:linuxbios-bounces at linuxbios.org] On Behalf Of Tom Sylla
Sent: Monday, November 13, 2006 1:01 PM
To: yhlu; linuxbios at linuxbios.org
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'?


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