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

[nb]

> Le 30 avr. 2015 à 17:11, Darren Hart <dvhart at linux.intel.com> a écrit :
> 
> 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 ».

Version: MNW2CRB1.X64.0071.R30.1408131301

> 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
>>> 
>>> _______________________________________________
>>> 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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