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Date: Fri, 20 Apr 2012 19:34:36 -0500
From: Corey Minyard <tcminyard@gmail.com>
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To: Nikola Ciprich <nikola.ciprich@linuxbox.cz>
CC: linux-kernel@vger.kernel.org, rob.herring@calxeda.com
Subject: Re: [BISECTED] ipmi_si not loading since 2.6.39
References: <20120420223833.GA7855@nik-comp.lan>
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On 04/20/2012 05:38 PM, Nikola Ciprich wrote:
> Hello,
>
> I was trying to find out why IPMI stopped working on new kernels. Since 2.6.39
> module loading ends with following message:
>
>   ipmi_si: Interface detection failed
>
> Then ipmitool is unable to control IPMI device.
>
> Works for 2.6.38, doesn't work for 2.6.39, 3.0.28, 3.4-rc1.
>
> I got this bisected to following commit:
>
> commit a1e9c9dd3383e6a1a762464ad604b1081774dbda
> Author: Rob Herring<rob.herring@calxeda.com>
> Date:   Wed Feb 23 15:37:59 2011 -0600
>
>      ipmi: convert OF driver to platform driver
>
>      of_bus is deprecated in favor of the plain platform bus. This patch
>      merges the ipmi OF driver with the existing platform driver.
>
>      CONFIG_PPC_OF occurrances are removed or replaced with CONFIG_OF.
>
>      Compile tested with and without CONFIG_OF. Tested OF probe and
>      default probe cases.
>
>      Signed-off-by: Rob Herring<rob.herring@calxeda.com>
>      Signed-off-by: Grant Likely<grant.likely@secretlab.ca>
>
> I wonder whether this is a bug, or I'm doing something wrong?

If it used to work and now it doesn't, that's probably a bug, though you 
might be able to work around it with some direct settings.

What hardware is involved?  'cat /proc/ipmi/0/params' on a working 
kernel would be handy.  You can use that information to hot-add the BMC, 
that should be documented in Documentation/IPMI.txt

-corey