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→XELK 3.x.y series
=====XELK 2.x.y series=====
Practically speaking, for [[Axel_Embedded_Linux_Kit_(XELK)#XELK_software_components|XELK 12.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.
By default, temperature thresholds are set up as follows:
*<code>trip_point0</code>:85°C*<code>trip_point1</code>:100°C.
Trip point thresholds can be accessed via <code>sysfs</code> interface from user space. The following example shows how to read the values of the trip points:
=====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 partsThe mechanism implemented in Linux kernel delivered along with XELK 3.x.y series is the same ** passive threshold: 85°C** critical threshold: 90°C*for extended commercial and industrial parts** passive threshold: 95°CTBD** critical threshold: 100°Cinserire link della patch*for automotive parts** passive threshold: 115°Chttp** critical threshold://lists.infradead.org/pipermail/linux-arm-kernel/2015-May/345780120°C.html
==Related links==
