Sure, to find the MC dev id you just read the SDR IPMB MC Locator record
(shown on the second line of the fruconfig output) to get the IMM FRU
information.  

However, loading the FRU information from fru device id 0 WILL still
give you the baseboard FRU information.  So, reading FRU data from
FruDeviceId 0 will still work fine, in all IPMI systems, and that is the
last section of the output I attached. 

The baseboard is where all of the devices and sensors connect, so most
likely that is really what you want to do anyway.  Is that what you
meant by FRU updates and appropriate FRU entries?  You don't really use
the IMM FRU entries except as inventory for that plugin card.  

Andy 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 
Sent: Monday, January 22, 2007 5:05 PM
To: Cress, Andrew R; [email protected]
Subject: RE: [Openipmi-developer] FRU dev id on IMM Module

Andy,

Thanks for the clarification.

Wouldn't this configuration pose as a problem: FRU updates are done to
the active bmc, w/c is device id 1; yet on bootup, we expect it to be at
device id 0.

Anyway, to retrive the active bmc device id? Or to determine that the
mini-bmc is overriden?

The code is used on both type of machines, I have to be able to
programmatically detect which device id is actually active and retrieve
the appropraite FRU entries.  Thanks.

Michael,

On the Jarrell motherboard where the IMM resides, there is a default
mini-BMC and then the IMM plugin with IPMI 2.0 and the advanced
features.  So, there are actually two BMCs, but only one is active at a
time.  That is why the IMM has a FRU Device ID of 1, since the mini-BMC
occupied FRU ID 0.  

This should not pose a problem, and attached is the output from
'fruconfig' (from ipmiutil) on a TIGI2U system with an IMM.  You can see
from the attached immfru.txt that the SlaveAddress/ChannelNumber for the
IMM BMC is 20/00, while the SlaveAddress/FruDeviceID is 20/01.  

The IPMI 1.5 text you reference is similar to text in section 37.7 about
the FRU Device ID, and is still true, since the mini-BMC on that
motherboard is FRU Device ID 0, but it is inactive.  

Andy

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