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AMDTEMP(4) Kernel Interfaces Manual AMDTEMP(4) NAME amdtemp -- device driver for AMD processor on-die digital thermal sensor SYNOPSIS To compile this driver into the kernel, place the following line in your kernel configuration file: device amdtemp Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): amdtemp_load="YES" DESCRIPTION The amdtemp driver provides support for the on-die digital thermal sensor present in AMD Family 0Fh, 10h, 11h, 12h, 14h, 15h, 16h, and 17h proces- sors. For Family 0Fh processors, the amdtemp driver reports each core's tempera- ture through sysctl nodes, named dev.amdtemp.%d.core{0,1}.sensor{0,1}. The driver also creates dev.cpu.%d.temperature in the corresponding CPU de- vice's sysctl tree, displaying the maximum temperature of the two sensors located in each CPU core. For Family 10h, 11h, 12h, 14h, 15h, 16h, and 17h processors, the driver re- ports each package's temperature through a sysctl node, named dev.amdtemp.%d.core0.sensor0. The driver also creates dev.cpu.%d.temperature in the corresponding CPU device's sysctl tree, dis- playing the temperature of the shared sensor located in each CPU package. SYSCTL VARIABLES The following variable is available as both sysctl(8) variable and loader(8) tunable: dev.amdtemp.%d.sensor_offset Add the given offset to the temperature of the sensor. Default is 0. SEE ALSO coretemp(4), loader(8), sysctl(8) HISTORY The amdtemp driver first appeared in FreeBSD 7.1. AUTHORS Rui Paulo <rpaulo@FreeBSD.org> Norikatsu Shigemura <nork@FreeBSD.org> Jung-uk Kim <jkim@FreeBSD.org> CAVEATS For Family 10h and later processors, "(the reported temperature) is a non- physical temperature measured on an arbitrary scale and it does not repre- sent an actual physical temperature like die or case temperature. Instead, it specifies the processor temperature relative to the point at which the system must supply the maximum cooling for the processor's specified maxi- mum case temperature and maximum thermal power dissipation" according to BIOS and Kernel Developer's Guide (BKDG) for AMD Processors, http://devel- oper.amd.com/resources/developer-guides-manuals/. FreeBSD ports 15.quarterly September 5, 2017 AMDTEMP(4)
NAME | SYNOPSIS | DESCRIPTION | SYSCTL VARIABLES | SEE ALSO | HISTORY | AUTHORS | CAVEATS
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