[MinnowBoard] Problem reading CPU temp in linux (yocto build)
Gerard Bucas
gerard.b at tekmagic.net
Fri May 1 00:15:24 UTC 2015
Thanks Darren
Don't worry - managed to get to the bottom of it, thanks to this good
article (in Japanese - which I can't read - but great pictures!):
http://kronus9.sblo.jp/article/115370184.html
It turns out this kernel config flag needed to be set:
CONFIG_SENSORS_CORETEMP=m
Interesting to observe:
that "zcat /proc/config.gz | grep CORETEMP" now returns
"CONFIG_SENSORS_CORETEMP=y"
BUT lsmod shows no modules installed and I still don't have the
CONFIG_SENSORS_CORETEMP file and I don't see "coreboot" anywhere on my
target system!
BUT "sensors" now works (after sensors-detect) as it shows the same "ISA
adapter" values that nb listed. So I also now see:
acpitz-virtual-0
Adapter: Virtual device
temp1: +26.8 C (crit = +90.0 C)
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +68.0 C (high = +127.0 C, crit = +127.0 C)
Core 2: +67.0 C (high = +127.0 C, crit = +127.0 C)
Thanks for all your help.
Gerard
-----Original Message-----
From: Darren Hart [mailto:dvhart at linux.intel.com]
Sent: Thursday, April 30, 2015 4:12 PM
To: gerard.b at tekmagic.net; MinnowBoard Development and Community Discussion;
'nb'
Subject: Re: [MinnowBoard] Problem reading CPU temp in linux (yocto build)
You mentioned having core temp loaded, but also said you don't have the
"CONFIG_SENSORS_CORETEMP" file (it's not a file, it's a kernel config option
which should be listed in /proc/config.gz if you are using a linux-yocto
kernel. Strange that you have the module loaded, but do not see the /sys
entries - I don't know how to explain that.
I'm out of time today - I'll try to have another look on Monday if nobody
else jumps in.
On 4/30/15, 10:10 AM, "Gerard Bucas" <gerard.b at tekmagic.net> wrote:
>Hi nb
>
>Thanks for all your great feedback.
>
>I don't have that CONFIG_SENSORS_CORETEMP file.
>
>It seems I must be missing some key "part" of lmsensors...
>
>I ran "sensors-detect" and then when I run "sensors" I only get:
>
>acpitz-virtual-0
>Adapter: Virtual device
>temp1: +26.8 C (crit = +90.0 C)
>
>Any ideas what else I need to do or install?
>
>My yocto "local.conf" build file includes the following for adding
>"lmsensors":
>
>IMAGE_INSTALL_append = " \
> lmsensors-libsensors \
> lmsensors-sensors \
> lmsensors-sensord \
> lmsensors-fancontrol \
> lmsensors-sensorsdetect \
> lmsensors-sensorsconfconvert \
> lmsensors-pwmconfig \
> lmsensors-isatools \
> lmsensors-config-cgi \
> "
>Would REALLY appreciate any help/pointers to get this working...
>
>THANKS!
>
>Gerad
>
>-----Original Message-----
>From: nb [mailto:nb at dagami.org]
>Sent: Thursday, April 30, 2015 12:30 PM
>To: MinnowBoard Development and Community Discussion
>Cc: Gerard Bucas
>Subject: Re: [MinnowBoard] Problem reading CPU temp in linux (yocto
>build)
>
>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
>>
>>
>>
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>
>
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--
Darren Hart
Intel Open Source Technology Center
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