[MinnowBoard] Problem reading CPU temp in linux (yocto build)
Darren Hart
dvhart at linux.intel.com
Thu Apr 30 15:11:44 UTC 2015
Gerard,
Which firmware version are you running? You can find this in the firmware
menu itself, or you can search for it in the results of dmidecode...
Something like "dmidecode | grep -C2 BIOS".
Thanks,
On 4/29/15, 1:24 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
>>
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>
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--
Darren Hart
Intel Open Source Technology Center
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