[lm-sensors] NCT6776 global registers 0x1c=0 and 0x24=0x5c onASRock

From: Harald Judt <h.judt@gmx.at>
To: lm-sensors@vger.kernel.org
Subject: [lm-sensors] NCT6776 global registers 0x1c=0 and 0x24=0x5c onASRock
Date: Wed, 21 Dec 2011 14:50:31 +0000	[thread overview]
Message-ID: <4EF1F237.7000107@gmx.at> (raw)
In-Reply-To: <20110410160433.GA22075@localhost>

Hi,

> On Tue, 12 Apr 2011 19:02:19 +0200, Ian Dobson wrote:
>> Hi,
>>
>> --------------------------------------------------
>> From: "Mike Campin" <lm_sensors at ootsa.homelinux.net>
>> Sent: Sunday, April 10, 2011 6:04 PM
>> To: <lm-sensors at lm-sensors.org>
>> Subject: [lm-sensors] NCT6776 global registers 0x1c=0 and 0x24=0x5c onASRock
>> Extreme4
>>
>> > Hi,
>> >
>> > Only 2 of the 5 fans are showing up on my ASRock P67 Extreme4 motherboard.
>> > It due to the NCT6776 global configuration register 0x1c and 0x24 values.
>> > The fans work if I modify these registers prior to loading the w83627ehf
>> > driver.
>> >
>> > My question is where are these registers initialized? Should I ask ASRock
>> > to fix the BIOS?
>> >
>> >  isadump -y -k 0x87,0x87 0x2e 0x2f
>> >
>> >          0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
>> >     00: ff ff 00 ff ff ff ff 02 ff ff ff ff ff ff ff ff
>> >     10: ff ff ff ff ff ff ff ff ff ff f8 0e 00 00 ff ff
>> >     20: c3 33 ff 00 5c 00 00 98 00 ff 20 00 80 00 00 01
>> >     30: 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>> >
>> >  isaset -y -f 0x2e 0x87
>> >  isaset -y -f 0x2e 0x87
>> >  isaset -y 0x2e 0x2f 0x1c 0x3
>> >  isaset -y 0x2e 0x2f 0x24 0x1c
>> >
>> > Thanks, Mike
>> >
>> > --
>> > Mike Campin
>> > lm_sensors at ootsa.homelinux.net
>> >
>> > _______________________________________________
>> > lm-sensors mailing list
>> > lm-sensors at lm-sensors.org
>> > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
>>
>> ASRock designed the board, so they should setup the hardware monitoring chip
>> correctly. Allowing users to change the chip configuration is a really bad
>> idea, as many of the pins can have different functionality/electrical
>> spcifications depending on the config. Setting up a pin incorrectly could
>> blow the chip (Configuring a pin so that it's a source that's connected to
>> an unprotected/limited sink for example).
>>
>> So ASRock should fix the BIOS.
>
> Seconded. But before flaming Asrock, two things worth checking:
> * Availability of a BIOS update fixing the issue.
> * Options in the BIOS to enable/disable the monitoring of specific
>   fans. I can imagine that the BIOS skips the configuration steps for
>   fans for which monitoring was disabled (although that would probably
>   mean more code than just doing it unconditionally...)
>
> --
> Jean Delvare

I own an Asrock P67 Extreme4 too and have the same problem. It can be 
solved by following Mike Campin's instructions, which I successfully 
incorporated into /etc/init.d/lm_sensors. There is no BIOS available 
that fixes this issue, but I noticed that SpeedFan for Windows 
(www.almico.com/speedfan.php) seems to do something similar, otherwise 
it would show only 2 fans too. So maybe we could get that into 
lm_sensors, even if the BIOS is at fault here?

Regards,
Harald

-- 
`Experience is the best teacher.'

_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors