Intel D845GEBV2 with lm85: config is locked

[khali@linux-fr.org (Jean Delvare)]

> I've got an Intel mainboard D845GEBV2 as replacement for my Asus
> P4B-266SE(that ASB100 mess). I've mounted it, gone through the configs
> and sensors-detect said I should use the lm85 driver. With lm85 it
> seem to work well, except I cannot change anything in the proc
> interface. The values reported seem correct but all changes (e.g.
> echoing values to the pwm# registers) are ignored...

This is a feature of the LM85. I remember I read that some times ago.
(reading again) Yes, here it is. Bit 1 of register 0x40 is lock. Once
set to 1, all limits are read only, and that bit itself becomes read
only. And yes, that bit it set to 1 on your chip. Blame your motherboard
manifacturer for that (I guess).

> Intel claims there is an SMSC LPC47M172 on board.

We don't have support for this one yet, but support some members of the
family in the smsc47m1 driver. Maybe you could give it a try (using CVS
version is recommended). They are ISA chips so they don't appear on the
I2C bus.

> Output of syslog
> -----------------------
> Oct  1 20:34:24 elexis kernel: lm85(0): Client (0,0x2e) config is
> locked.

See, that's what I said.

> elexis:~# i2cdetect 0
>      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
> 00: XX XX XX XX XX XX XX XX 08 XX XX XX XX XX XX XX
> 10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
> 20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX 2e XX
> 30: 30 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
> 40: XX XX XX XX 44 XX XX XX XX XX XX XX XX XX XX XX
> 50: 50 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
> 60: XX XX XX XX XX XX XX XX XX 69 XX XX XX XX XX XX
> 70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

You did not dump address 0x08. Maybe there's something interesting
there? (Although I admit we don't know any chip living there yet).

> I had to do a cold reset after the use of i2cdetect/dump.

Yes, that happends, especially after dumping address 0x69 which is a
clock chip you should avoid playing with.

> Do you have an idea how to solve that problem?

I am afraid you can't do anything :(

> PS: sorry if I sent it multiple - my posts didn't appear on the list.

Got only one, so it's OK :)

-- 
Jean Delvare
http://www.ensicaen.ismra.fr/~delvare/