Directions for Heat Sink?

gaara · Published in 2015-7-21 03:16:23

I have bought this one, with adhesive: http://fr.aliexpress.com/item/8- ... ts/32292684316.html

magicse · Published in 2015-7-21 04:35:30

gaara replied at 2015-7-20 21:16
I have bought this one, with adhesive: http://fr.aliexpress.com/item/8-set-32pcs-Banana-Pi-Cooler-Ki ...

It's aluminium but not copper.

There are 4 heatsinks in the store, which of them do you used for CPU

gaara · Published in 2015-7-21 05:08:12

The big one for CPU (I have the A20 Orange), the both medium for RAM and the little for... what you want !

magicse · Published in 2015-7-21 05:15:18

gaara replied at 2015-7-20 23:08
The big one for CPU (I have the A20 Orange), the both medium for RAM and the little for... what you ...

And what processor temperature now?

gaara · Published in 2015-7-21 14:00:48

about 55°C with a 25x25 fan

magicse · Published in 2015-7-21 14:19:43

Is This means that the heat sink is not provide normal heat removal without the fan and could not work in mode of Passive cooling?

matteobp · Published in 2015-7-21 15:52:26

gaara replied at 2015-7-21 14:00
about 55°C with a 25x25 fan

How can I check the CPU temperature? Is it possible?

Thanks.

bronco · Published in 2015-7-21 15:54:59

gaara replied at 2015-7-21 14:00
about 55°C with a 25x25 fan

Totally weird if you're speaking about an A20 based Orange Pi. You shouldn't be able to exceed 55°C even when the A20 is overclocked and running a 'stress' test: http://www.lemaker.org/forum.php ... 7&fromuid=33332

There's something wrong. Maybe you're measuring instead the temperature of the AXP209 PMU? You can try out the sunxi_tp_temp tool referenced in the thread above. And check the PMU's temperature using:

awk '{printf ("%0.1f",$1/1000); }' </sys/devices/platform/sunxi-i2c.0/i2c-0/0-0034/temp1_input

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For all users of an H3 based Orange Pi: you should become familiar with what let your board overheat and adjust that: http://linux-sunxi.org/Cpufreq

And heatsinks are pretty useless when you're not ensuring airflow. A heatsink in a small enclosure is wasted money.

bronco · Published in 2015-7-21 16:04:03

matteobp replied at 2015-7-21 15:52
How can I check the CPU temperature? Is it possible?

Thanks.

Depends on the device you're using. And generally speaking: You won't be able to read out "CPU temperature" -- only SoC or PMU.

The A20 contains a touchpad controller which contains a thermal sensor. This piece of hardware is nearly undocumented and even the kernel sources for its driver say regarding the thermal values:

* Allwinner does not have any documentation whatsoever for
* this hardware. Moreover, it is claimed that the sensor
* is inaccurate and cannot work properly.

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The H3 has a "Thermal Sensor Controller (TSC) providing over-temperature protection interrupt and over-temperature alarm interrupt" which is read out by a driver being responsible for shutting down CPU cores (one after another) when internal temperatures exceed 70°C. So there's a driver that can both read out these values and act upon.

But this is not "CPU". This is always "SoC" (containing GPU cores and other stuff like a display controller, that also produce heat).

And then there's the PMU/PMIC. On A20 based boards this is always the AXP209 which has an internal thermal sensor that can be read out (more precisely than the A20's touchpad controller). No idea about H3's PMIC. But gaara talked about an A20 based Orange Pi (and most likely not about SoC but PMU instead).

matteobp · Published in 2015-7-21 16:27:23

bronco replied at 2015-7-21 16:04
Depends on the device you're using. And generally speaking: You won't be able to read out "CPU temp ...

Thanks for the good explanation. I have a Orange Pi Plus (H3 based), and it is ok for me to read the available temperature information (SoC or PMU).
This link is related only to CPU frequency (I already know it)
http://linux-sunxi.org/Cpufreq
but there is no info about temperature.