SMBus of Sis650/961 P4 system not recognised

SMBus of Sis650/961 P4 system not recognised

[subscriptions-EwJsF0SrM7dWk0Htik3J/w]

Problem: sensors-detect, revision 5249, doesn't detect any sensors.

System:
A928 ECS Desknote
HW: P4, SiS 650/961 motherboard
SW: Debian Etch 40R1, Linux 2.6.18-6, lm-sensors 3.0.2

Analysis, yet without solution:
Under Windows XP (FanSpeed programme) a Winbond W83L784R and two LM75
are detected and temperatures properly represented.
Linux loads the i2c-sis96x busses driver.
The chipset presents itself with vendor ID 1039 and devices IDs 0008 and
0650 and 6325 (and 5513, 7012, 0001, 7012 but irrelevant here).

FanSpeed (WinXP on dual-boot system) reports:
SiS650	SMBus at $0B80
	ISA Bus at $0290
		SuperIO Winbond W83L517D
SiSx30	SMBus at $0B80
		Winbond W83L784R (ID=$51) @ $2D
		LM75 @ $48
		LM75 @ $49	

How can I make lm-sensors / sensors-detect, and/or Linux 2.6.18-6 to
discover this SMBus @ $0B80 with the sensors on it ??


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Re: SMBus of Sis650/961 P4 system not recognised

[Jean Delvare]

Hi person-with-no-name,

On Sun, 14 Sep 2008 12:29:41 +0100, subscriptions-EwJsF0SrM7dWk0Htik3J/w@public.gmane.org wrote:
> Problem: sensors-detect, revision 5249, doesn't detect any sensors.
> 
> System:
> A928 ECS Desknote
> HW: P4, SiS 650/961 motherboard
> SW: Debian Etch 40R1, Linux 2.6.18-6, lm-sensors 3.0.2
> 
> Analysis, yet without solution:
> Under Windows XP (FanSpeed programme) a Winbond W83L784R and two LM75
> are detected and temperatures properly represented.
> Linux loads the i2c-sis96x busses driver.
> The chipset presents itself with vendor ID 1039 and devices IDs 0008 and
> 0650 and 6325 (and 5513, 7012, 0001, 7012 but irrelevant here).
> 
> FanSpeed (WinXP on dual-boot system) reports:
> SiS650	SMBus at $0B80
> 	ISA Bus at $0290
> 		SuperIO Winbond W83L517D
> SiSx30	SMBus at $0B80
> 		Winbond W83L784R (ID=$51) @ $2D
> 		LM75 @ $48
> 		LM75 @ $49	
> 
> How can I make lm-sensors / sensors-detect, and/or Linux 2.6.18-6 to
> discover this SMBus @ $0B80 with the sensors on it ??

There are two separate issues here, which you are apparently mixing.

* The SiS south bridge itself doesn't include any sensors. It implements
an SMBus master. You need to get this one to work first. You say that
Linus loads the i2c-sis96x driver, which may or may not mean that it
works (SiS chips are very odd to identify, as can be seen with FanSpeed
too.) So, first of all, please do:

modprobe i2c-dev
i2cdetect -l

And see if there's an SMBus listed for the SiS chip. If it is, you can
additionally run i2cdetect on it to see if devices connected to the bus
are seen.

* The sensor chip itself is, in your case, connected to the SMBus. You
need a separate driver for it. This is not the right list to discuss
this though, please use the lm-sensors list instead.

-- 
Jean Delvare

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Re: SMBus of Sis650/961 P4 system not recognised

[Jean Delvare]

Hi Martin,

Please keep the i2c list Cc'd.

On Sat, 20 Sep 2008 17:42:27 +0100, subscriptions-EwJsF0SrM7dWk0Htik3J/w@public.gmane.org wrote:
> your response is most appreciated. ! However after loading the 12c-dev
> module successfully I cannot run i2cdetect as it seems not to be a part
> of the latest lm-sensors (3.0.2) for 2.6 kernels.
> 
> What should I do to cure the absence of this detection utility ?

i2cdetect is part of the i2c-tools package:
http://www.lm-sensors.org/wiki/I2CTools

-- 
Jean Delvare

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Re: SMBus of Sis650/961 P4 system not recognised

[subscriptions-EwJsF0SrM7dWk0Htik3J/w]

Thanks; had not seen a reference to the separate tools package; now
compiled the i2ctools and ran i2cdetect:
------------------------------------------------------------------
  Installed I2C busses:
    i2c-0       smbus           SiS96x SMBus adapter at 0x0c00

WARNING! This program can confuse your I2C bus, cause data loss and
worse!
I will probe file /dev/i2c-0.
I will probe address range 0x03-0x77.
Continue? [Y/n] Y
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- 08 -- -- -- -- -- -- --
10: 10 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- 2d -- --
30: 30 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 49 -- -- -- -- -- --
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- 69 6a -- -- -- -- --
70: -- -- -- -- -- -- -- --
-------------------------------------------------------------------
So the bus is seen; 2d, 48, and 49 correspond to what Fanspeed reported
to be a Winbond W83L517D and two LM75, albeit that Fanspeed reported the
SMBus to be at $0B80 and i2cdetect reports it to be at $0c00.

Will post my question about how to get a driver istalled for the
W83L517D and used by lm-sensors in the other mailing list. Thanks for
your help Jean !


On Thu, 2008-09-25 at 10:37 +0200, Jean Delvare wrote:
> Hi Martin,
> 
> Please keep the i2c list Cc'd.
> 
> On Sat, 20 Sep 2008 17:42:27 +0100, subscriptions-EwJsF0SrM7dWk0Htik3J/w@public.gmane.org wrote:
> > your response is most appreciated. ! However after loading the 12c-dev
> > module successfully I cannot run i2cdetect as it seems not to be a part
> > of the latest lm-sensors (3.0.2) for 2.6 kernels.
> > 
> > What should I do to cure the absence of this detection utility ?
> 
> i2cdetect is part of the i2c-tools package:
> http://www.lm-sensors.org/wiki/I2CTools
> 


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