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=====XELK 2.x.y series=====
Practically speaking, for [[Axel_Embedded_Linux_Kit_(XELK)#XELK_software_components|XELK 1.x.y series]] this mechanism makes use of two different thresholds, denoted as <code>trip_point0</code> (also known as ''passive threshold'') and <code>trip_point1</code>(also known as ''critical threshold''. When Tj reaches <code>trip_point0</code>, Linux kernel scales down processor frequency:
<pre>
System is too hot. GPU3D will work at 1/64 clock.
For more details about this functionality, please refer to <code>Documentation/thermal/sysfs-api.txt</code> in the kernel sources.
=====XELK 3.x.y series=====
XELK 3.x.y kernels implement the same mechanism of XELK 2.x.y series. However a notable difference exists, that is default temperature thresholds depend on the silicon grade, as follows:
*for commercial parts
** trpassive thresholds: 85°C105°C ** critical thresholds: 90°C*for extended commercial and industrial parts125°C ** passive thresholds: 95°C** critical thresholds: 100°C*for automotive parts.The mechanism implemented in Linux kernel delivered along with XELK 3.x.y series is the same TBDinserire link della patch** passive thresholds: 115°Chttp** critical thresholds://lists.infradead.org/pipermail/linux-arm-kernel/2015-May/345780120°C.html
==Related links==
*[[Power_consumption_(AxelLite)|Power consumption of AxelLite SOM]]
*[[FAQs_(Axel)|SoC frequency management]]
*[[Power_management_(Axel)|Power management of Axel product family]].
