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

[nb]

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 it’s 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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