Hi,

here's further information Rob and Corey requested:

on working system:

[root@vbox4 ~]# cat /proc/ipmi/0/params
kcs,i/o,0xca2,rsp=1,rsi=1,rsh=0,irq=0,ipmb=0

dmesg snippet:

[   41.759319] ipmi message handler version 39.2
[   41.760690] ipmi device interface
[   42.765334] IPMI System Interface driver.
[   42.765336] ipmi_si: probing via hardcoded address
[   42.765337] ipmi_si: Adding hardcoded-specified kcs state machine
[   42.765340] ipmi_si: Trying hardcoded-specified kcs state machine at i/o address 0xca8, slave address 0x0, irq 0
[   42.765344] ipmi_si: Interface detection failed
[   42.770823] ipmi_si: probing via SMBIOS
[   42.770834] ipmi_si: SMBIOS: io 0xca2 regsize 1 spacing 1 irq 0
[   42.770836] ipmi_si: Adding SMBIOS-specified kcs state machine
[   42.770838] ipmi_si: probing via SPMI
[   42.770840] ipmi_si: SPMI: io 0xe4 regsize 1 spacing 1 irq 0
[   42.770841] ipmi_si: Adding SPMI-specified kcs state machine
[   42.770843] ipmi_si: Trying SMBIOS-specified kcs state machine at i/o address 0xca2, slave address 0x0, irq 0
[   42.798137] ipmi_si ipmi_si.0: Error clearing flags: cc
[   42.801011] ipmi_si ipmi_si.0: Found new BMC (man_id: 0x002a7c, prod_id: 0x0624, dev_id: 0x20)
[   42.801068] ipmi_si ipmi_si.0: IPMI kcs interface initialized


dmidecode:

IPMI Device Information
        Interface Type: KCS (Keyboard Control Style)
        Specification Version: 2.0
        I2C Slave Address: 0x00
        NV Storage Device: Not Present
        Base Address: 0x0000000000000CA2 (I/O)
        Register Spacing: Successive Byte Boundaries

Base Board Information
        Manufacturer: Supermicro
        Product Name: X9SCL/X9SCM

(but we're experiencing this on various supermicro bords, ie X8DTL)

Tried setting parameters by hand didn't help:

modprobe ipmi_si type=kcs addrs=0xca8 regspacings=1 regsizes=1 regshifts=0 irqs=0 slave_addrs=0x0

(not sure whether I got them correct though, and values mostly seem to me to be defaults anyways..)

nik


On Sat, Apr 21, 2012 at 12:38:33AM +0200, 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?
> 
> Thanks in advance!
> 
> with best regards
> 
> nik
> 
> 
> -- 
> -------------------------------------
> Ing. Nikola CIPRICH
> LinuxBox.cz, s.r.o.
> 28. rijna 168, 709 01 Ostrava
> 
> tel.:   +420 596 603 142
> fax:    +420 596 621 273
> mobil:  +420 777 093 799
> 
> www.linuxbox.cz
> 
> mobil servis: +420 737 238 656
> email servis: servis@linuxbox.cz
> -------------------------------------



-- 
-------------------------------------
Ing. Nikola CIPRICH
LinuxBox.cz, s.r.o.
28. rijna 168, 709 01 Ostrava

tel.:   +420 596 603 142
fax:    +420 596 621 273
mobil:  +420 777 093 799

www.linuxbox.cz

mobil servis: +420 737 238 656
email servis: servis@linuxbox.cz
-------------------------------------