There is an SMBus MUX on this motherboard that prevents the ADM1026 from
being accessable by default at boot. You need to poke the MUX to enable
the ADM1026 onto the SMBus.
I have a BIOS (beta? 1.60) from Arima that you should be able to get
from your Arima rep that is supposed to enable the ADM1026 onto the
SMBus by default. I haven't tested it yet, but suspect it will work.
However, in the mean time, you can poke the mux by running i2cdump
against address 0x70 on the SMBus. That has the effect of enabling all
the MUX sub-busses and making the ADM1026 visible. So if you:
modprobe i2c-amd756
i2cdump 0 0x70
modprobe adm1026
You should see the chip.
:v)
Atish Datta Chowdhury wrote:
> Hi,
> Appreciate any help on getting an adm1026 on a dual opteron
> working. I am listing my observtions below. 'Will be grateful for
> any solution to this..:
>
> Problem summary:
> ----------------
>
> Motherboard : Arima (BIOS 1.50) dual opteron
>
> When using lm_sensors with the patch from penguincomputing (Philip
> Pokorney), the adm1026 can be detected by sensors-detect, but even after
> a correct build and install of the suggested modules, we get the
> following error upon running sensors:
> "No sensors found"
>
> Possible cause:
> ---------------
>
> We did not see the adm1026 either under /proc/sys/dev or /proc/bus/i2c
> The modules loaded at the time of running sensors were:
> i2c-core, i2c-dev, i2c-proc, i2c-amd756, adm1026.
> Are there patches (e.g to adm1026 or i2c-proc) that we are missing?
>
> Detailed description:
> ----------------------
>
> 1) downloaded i2c-2.7.0 and lm_sensors 2.7.0 from
> http://www2.lm-sensors.nu/~lm78/download.html
> 2) patch adm1026 on to lm_Sensors-2.7.0 from
> ftp.penguincomputing.com/pub/updates/lmsensors/lm_sensors-2.7.0-adm1026-9.patch
>
> 3) Build (64 bit) against 2.4.19 (Suse's distribution : United Linux 1.0))
> builds with nominal problems
> 4) Install (both i2c and lm_sensors)
> 5) sensors-detect finds adm1026 off the SMBus AMD8111 adapter
> and lists i2c-amd756, adm1026.
> 6) insmod modules i2c-core, i2c-dev, i2c-porc, i2c-isa , i2c-amd756 and
> adm1026:
>
> i2c-core.o: i2c core module version 2.7.0 (20021208)
> i2c-dev.o: i2c /dev entries driver module version 2.7.0 (20021208)
> i2c-proc.o version 2.7.0 (20021208)
> i2c-amd756.o version 2.7.0 (20021208)
> i2c-amd756.o: Found AMD8111 SMBus controller.
> adm1026: Version 2.7.0 (20021208)
> adm1026: See http://www.penguincomputing.com/lm_sensors for more info.
>
> 7) "sensors" gives:
> No sensors found!
>
> -thanks and regards,
> Atish
>
> Atish Datta Chowdhury
> Software Engineer
> Angstrom Microsystems
>
--
Philip Pokorny, Director of Engineering
Tel: 415-358-2635 Fax: 415-358-2646 Toll Free: 888-PENGUIN
PENGUIN COMPUTING, INC.
www.penguincomputing.com
