[lm-sensors] DDR2 SODIMM temperature sensor driver

[lm-sensors] DDR2 SODIMM temperature sensor driver

[Felix Radensky]

Hi,

I'm looking for a driver for DDR2 SODIMM temperature sensor.
Is it available for Linux, or maybe somebody is working on it ?

Any help appreciated.

Thanks a lot.

Felix.


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Re: [lm-sensors] DDR2 SODIMM temperature sensor driver

[Jean Delvare]

Hi Felix,

On Mon, 10 Nov 2008 12:47:23 +0200, Felix Radensky wrote:
> I'm looking for a driver for DDR2 SODIMM temperature sensor.
> Is it available for Linux, or maybe somebody is working on it ?

The only temperature sensor driver we have for memory modules is
i5k_amb, which handles the Intel 5000 series chipsets:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/hwmon/i5k_amb.c
These chips are only found in high-end servers as far as I know. I
don't know exactly where the sensors are located, maybe Darrick (Cc'd)
knows more.

What is your hardware exactly, and what makes you think it has
temperature sensors integrated in the memory modules?

-- 
Jean Delvare

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Re: [lm-sensors] DDR2 SODIMM temperature sensor driver

[Felix Radensky]

Hi, Jean

Thanks for replying.

The hardware is embedded PowerPC board equipped with
DDR2 SORDIMM module from Micron. The module
datasheet indicates it has temperature sensor. See
http://www.micron.com/products/partdetail?part=MT9HTF6472RHY-667

There's a JEDEC standard for temperature sensors in mobile DDR
modules. I know that OpenBSD has driver that supports it.

Felix.

Jean Delvare wrote:
> Hi Felix,
>
> On Mon, 10 Nov 2008 12:47:23 +0200, Felix Radensky wrote:
>   
>> I'm looking for a driver for DDR2 SODIMM temperature sensor.
>> Is it available for Linux, or maybe somebody is working on it ?
>>     
>
> The only temperature sensor driver we have for memory modules is
> i5k_amb, which handles the Intel 5000 series chipsets:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/hwmon/i5k_amb.c
> These chips are only found in high-end servers as far as I know. I
> don't know exactly where the sensors are located, maybe Darrick (Cc'd)
> knows more.
>
> What is your hardware exactly, and what makes you think it has
> temperature sensors integrated in the memory modules?
>
>   


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Re: [lm-sensors] DDR2 SODIMM temperature sensor driver

[Felix Radensky]

Hi, Jean

Here's a link to JDEC spec:

www.jedec.org/download/search/4_07R15.pdf

Felix.

Jean Delvare wrote:
> Hi Felix,
>
> On Mon, 10 Nov 2008 12:47:23 +0200, Felix Radensky wrote:
>   
>> I'm looking for a driver for DDR2 SODIMM temperature sensor.
>> Is it available for Linux, or maybe somebody is working on it ?
>>     
>
> The only temperature sensor driver we have for memory modules is
> i5k_amb, which handles the Intel 5000 series chipsets:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/hwmon/i5k_amb.c
> These chips are only found in high-end servers as far as I know. I
> don't know exactly where the sensors are located, maybe Darrick (Cc'd)
> knows more.
>
> What is your hardware exactly, and what makes you think it has
> temperature sensors integrated in the memory modules?
>
>   


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Re: [lm-sensors] DDR2 SODIMM temperature sensor driver

[Darrick J. Wong]

On Mon, Nov 24, 2008 at 09:30:21AM +0100, Jean Delvare wrote:
> Hi Felix,
> 
> On Mon, 10 Nov 2008 12:47:23 +0200, Felix Radensky wrote:
> > I'm looking for a driver for DDR2 SODIMM temperature sensor.
> > Is it available for Linux, or maybe somebody is working on it ?
> 
> The only temperature sensor driver we have for memory modules is
> i5k_amb, which handles the Intel 5000 series chipsets:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/hwmon/i5k_amb.c
> These chips are only found in high-end servers as far as I know. I
> don't know exactly where the sensors are located, maybe Darrick (Cc'd)
> knows more.

The FB-DIMM temperature sensors are inside the AMB buffer chip on the
memory module.  Not sure how many non-FB DDR2 DIMMs have temperature
sensors that you can read; none of my machines (even the laptops) have
any.

--D

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