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alex.blackbit
Advocate
Joined: 26 Jul 2005
Posts: 2397
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 Posted: Fri Sep 09, 2005 8:56 pm Post subject: does a alpha cpu have a thermal sensor? |
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hi all!
does anybody know if the digital alpha processors have a thermal sensor?
and if yes how to read it out?
in my case it would be a ev56
thanks |
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i92guboj
Bodhisattva
Joined: 30 Nov 2004
Posts: 10315
Location: Córdoba (Spain)
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| Posted: Sat Sep 10, 2005 3:07 am Post subject: |
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| I know nothing about alpha's, but the sensors would be in the motherboard, not the cpu. To be able to read the sensor, in case it exists, you need to include the relevant drivers in your kernel. If you are in doubt mark in make menuconfig all the drivers related to I2C (compiled statically, not as modules). If your motherboard's sensors are supported by the linux kernel you should be able to read the sensors info thru /proc/acpi/thermal_zone/THRM/temperature. You can use also a program like mbmon, xmbmon, gkrellm, torsmo or conky to read that info, but remember that you still need the drivers in your kernel. |
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griffypoo
n00b
Joined: 28 Jan 2005
Posts: 16
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| Posted: Sun Sep 11, 2005 6:00 am Post subject: Short answer... |
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| No. Newer Alpha systems such as the UP1100 do include a thermal sensor, but they use the ev6 CPU rather than the ev56.. The ev56 was around before thermal sensors were all the rage.. |
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alex.blackbit
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Joined: 26 Jul 2005
Posts: 2397
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| Posted: Sun Sep 11, 2005 7:50 am Post subject: |
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oh 
but anyway
on such a ev6 system, how would i read that sensor out?
like 6thpink said? |
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griffypoo
n00b
Joined: 28 Jan 2005
Posts: 16
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| Posted: Mon Sep 12, 2005 5:38 am Post subject: |
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| There's a program called lm_sensors that provides an interface between the hardware and various software programs like gkrellm that were mentioned earlier. For more information on this program, see http://secure.netroedge.com/~lm78/ |
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doublehp
Guru
Joined: 11 Apr 2005
Posts: 473
Location: FRANCE
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| Posted: Wed Sep 28, 2005 9:48 pm Post subject: |
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| 6thpink wrote: | | I know nothing about alpha's, but the sensors would be in the motherboard, not the cpu. |
Intel (SIC) processors include a hardware sensor that shuts down the CPU automatically around 92 or 95 or 98 deg cel, as build in device since Pentium3 from memory. That sensor may not be readable for user.
This is urgently required for all manifacturers since above 108 deg cel, silicium is not resistive at all, and die becomes one big piece of conductive stuff ... then all 120W (think 5V 25A) can be redirected to any thing, including IDE (burn HDDs) or LPT or VGA (explode your printer or amplifier of VGA input) or any other device that is not isolated using led briges.
Since many years, all CPUs have internal protection against that short circuit ... for your safetry.
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