[MinnowBoard] Problem reading CPU temp in linux (yocto build)

Gerard Bucas gerard.b at tekmagic.net
Thu Apr 30 17:05:54 UTC 2015 

Darren,

I don't "see" that "coretemp" there!

Here is what I "see" on my minnowBoard MAX:

>  ls -l /sys/bus/platform/drivers
total 0
drwxr-xr-x 2 root root 0 Apr 30 16:50 acpi-fan
drwxr-xr-x 2 root root 0 Apr 30 16:50 alarmtimer
drwxr-xr-x 2 root root 0 Apr 30 16:50 byt_gpio
drwxr-xr-x 2 root root 0 Apr 30 16:50 cherryview-pinctrl
drwxr-xr-x 2 root root 0 Apr 30 16:50 clk-lpt
drwxr-xr-x 2 root root 0 Apr 30 16:50 dw-apb-uart
drwxr-xr-x 2 root root 0 Apr 30 16:50 dwc3
drwxr-xr-x 2 root root 0 Apr 30 16:50 efi-framebuffer
drwxr-xr-x 2 root root 0 Apr 30 16:50 generic-bl
drwxr-xr-x 2 root root 0 Apr 30 16:50 iTCO_wdt
drwxr-xr-x 2 root root 0 Apr 30 16:50 leds-gpio
drwxr-xr-x 2 root root 0 Apr 30 16:50 sdhci-acpi
drwxr-xr-x 2 root root 0 Apr 30 16:50 serial8250
drwxr-xr-x 2 root root 0 Apr 30 16:50 usb_phy_generic
drwxr-xr-x 2 root root 0 Apr 30 16:50 vesa-framebuffer
drwxr-xr-x 2 root root 0 Apr 30 16:50 xhci-hcd
root at intel-corei7-64:/sys/bus/platform/drivers#

Guess I am missing something in my build!?

Gerard

-----Original Message-----
From: elinux-MinnowBoard
[mailto:elinux-minnowboard-bounces at lists.elinux.org] On Behalf Of Darren
Hart
Sent: Thursday, April 30, 2015 12:53 PM
To: MinnowBoard Development and Community Discussion
Subject: Re: [MinnowBoard] Problem reading CPU temp in linux (yocto build)

Coretemp presents a sysfs interface, start navigating under:

/sys/bus/platform/drivers/coretemp/

And I think you'll find what you're looking for.

On 4/30/15, 9:30 AM, "nb" <nb at dagami.org> wrote:

>CONFIG_SENSORS_CORETEMP=m
>
>and in lsmod
>
>coretemp               12820  0
>
>
>> Le 30 avr. 2015 à 18:04, Darren Hart <dvhart at linux.intel.com> a écrit :
>> 
>> You will need the.... coretemp module loaded or built-in. You can 
>>check if  it's loaded with lsmod, and if it's configured in by looking 
>>for  CONFIG_SENSORS_CORETEMP in /proc/config.gz:
>> 
>> $ zcat /proc/config.gz | grep CORETEMP
>> 
>> Thanks,
>> 
>> Darren
>> 
>> On 4/30/15, 8:46 AM, "Gerard Bucas" <gerard.b at tekmagic.net> wrote:
>> 
>>> Hi Darren
>>> 
>>> For Some reason or other I can't find find ANY way to read the Core 
>>> temperatures (I have multiple boards) as even LMSENSORS doesn't give 
>>> me that 'ISA Adapter' related core temps that nb reported in this
thread.
>>> 
>>> Not sure what I'm doing wrong - LMSENSORS seems to be working (went 
>>> through the whole 'sensors-detect' sequence) but it (also) only 
>>> finds that 'virtual temp' device which also always returns that 26800
value.
>>> 
>>> I am using latest 0.79 firmware (will add to bug database).
>>> 
>>> Any ideas how else I can read core temps (yocto Linux build)?
>>> 
>>> Thanks
>>> 
>>> Gerard
>>> 
>>> 
>>> 
>>>> On Apr 30, 2015, at 11:07 AM, Darren Hart <dvhart at linux.intel.com>
>>>> wrote:
>>>> 
>>>> The "core" temps appear to be correct, while the acpitz driver does 
>>>>not  appear to be providing updates. I will raise this with the 
>>>>driver teams.
>>>> Thank you for reporting.
>>>> 
>>>>> On 4/29/15, 2:46 PM, "nb" <nb at dagami.org> wrote:
>>>>> 
>>>>> Hi,
>>>>> 
>>>>> I always have same value (26.8°C), whatever the cpu does.
>>>>> 
>>>>> Regards
>>>>> 
>>>>> nb
>>>>> 
>>>>> 
>>>>>> Le 29 avr. 2015 à 22:38, Gerard Bucas <gerard.b at tekmagic.net> a 
>>>>>>écrit
>>>>>> :
>>>>>> 
>>>>>> Hi nb
>>>>>> 
>>>>>> Thanks but I see that your  temp ALSO returns 26.8C (same as 
>>>>>>mine!!).
>>>>>> That is the 'problem', no matter what the chip temp is (could be 
>>>>>>too  hot  to even touch under heavy load) - the temp returned is 
>>>>>>ALWAYS 26.8C!!!
>>>>>> 
>>>>>> Have a look and let me know if that is also what you observe 
>>>>>> (seems like it from what you wrote as it is too much of a 
>>>>>> co-incidence that you get EXACTLY the same value as I do - hot or 
>>>>>> cold!!)
>>>>>> 
>>>>>> Thanks
>>>>>> 
>>>>>> Gerard
>>>>>> 
>>>>>> 
>>>>>>> On Apr 29, 2015, at 4:24 PM, nb <nb at dagami.org> wrote:
>>>>>>> 
>>>>>>> Hi Gerard,
>>>>>>> 
>>>>>>> On my Debian:
>>>>>>> 
>>>>>>> sensors
>>>>>>> acpitz-virtual-0
>>>>>>> Adapter: Virtual device
>>>>>>> temp1:        +26.8°C  (crit = +90.0°C)
>>>>>>> 
>>>>>>> coretemp-isa-0000
>>>>>>> Adapter: ISA adapter
>>>>>>> Core 0:       +50.0°C  (high = +110.0°C, crit = +110.0°C)
>>>>>>> Core 2:       +51.0°C  (high = +110.0°C, crit = +110.0°C)
>>>>>>> 
>>>>>>> So it¹s the same (sensors is in lm-sensors package)
>>>>>>> 
>>>>>>> Regards
>>>>>>> 
>>>>>>> nb
>>>>>>> 
>>>>>>> 
>>>>>>>> Le 29 avr. 2015 à 22:04, Gerard Bucas <gerard.b at tekmagic.net> a 
>>>>>>>> écrit
>>>>>>>> :
>>>>>>>> 
>>>>>>>> Hi Everyone,
>>>>>>>> 
>>>>>>>> We use linux (custom built with yocto project) on minnowBoard MAX.
>>>>>>>> Works great!
>>>>>>>> 
>>>>>>>> However, I have a problem reading the CPU core temperature of 
>>>>>>>> the E3825.
>>>>>>>> When I use this command line:
>>>>>>>> 
>>>>>>>> cat /sys/class/thermal/thermal_zone0/temp
>>>>>>>> 
>>>>>>>> It ALWAYS returns the value: 26800 (= 26.8C)
>>>>>>>> 
>>>>>>>> Linux kernel version: 3.19.2-yocto-standard
>>>>>>>> 
>>>>>>>> Build Configuration:
>>>>>>>> BB_VERSION        = "1.27.0"
>>>>>>>> BUILD_SYS         = "x86_64-linux"
>>>>>>>> NATIVELSBSTRING   = "Ubuntu-14.04"
>>>>>>>> TARGET_SYS        = "x86_64-poky-linux"
>>>>>>>> MACHINE           = "intel-corei7-64" (recommended by Intel for
>>>>>>>>Atom
>>>>>>>> E38XX SoC & minnowBoard MAX)
>>>>>>>> DISTRO            = "poky"
>>>>>>>> DISTRO_VERSION    = "1.8+snapshot-20150429"
>>>>>>>> 
>>>>>>>> It looks like this value is hard-coded in the kernel! In 
>>>>>>>>researching  this on the internet it seems that many people have 
>>>>>>>>this problem  with  a variety of Intel based CPU's/SoC's on a 
>>>>>>>>variety of different linux  distributions.
>>>>>>>> 
>>>>>>>> Has anyone else solved this problem or do you know of another 
>>>>>>>>linux  command line that would give me the CPU (chip) 
>>>>>>>>temperature?
>>>>>>>> 
>>>>>>>> I have tried to add the "lm-sensors" package but have had 
>>>>>>>> problems adding it to my yocto build as I can't seem to find 
>>>>>>>> the right "package group" that includes lm-sensors.
>>>>>>>> Any ideas/help would be MUCH appreciated!
>>>>>>>> 
>>>>>>>> Thanks
>>>>>>>> Gerard
>>>>>>>> 
>>>>>>>> _______________________________________________
>>>>>>>> elinux-MinnowBoard mailing list 
>>>>>>>> elinux-MinnowBoard at lists.elinux.org
>>>>>>>> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>>>>> 
>>>>> _______________________________________________
>>>>> elinux-MinnowBoard mailing list
>>>>> elinux-MinnowBoard at lists.elinux.org
>>>>> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>>>> 
>>>> 
>>>> --
>>>> Darren Hart
>>>> Intel Open Source Technology Center
>>>> 
>>>> 
>>>> 
>>> 
>> 
>> 
>> --
>> Darren Hart
>> Intel Open Source Technology Center
>> 
>> 
>> 
>> _______________________________________________
>> elinux-MinnowBoard mailing list
>> elinux-MinnowBoard at lists.elinux.org
>> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>
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--
Darren Hart
Intel Open Source Technology Center



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