The first order was to design a reasonable active cooling solution. I designed a simple stand to hold a fan directly under the SOC and memory. In trying to minimize the effect on the current design, I decided to keep the height as low as possible. Reusing an existing HK OEM heatsink fan seemed like a good starting point since there aren’t to many fan choices that are thinner and I had one available. OpenSCAD FIles and stl
20190311 Odroid-N2 Fan Stand_v1.zip
20190312 Odroid-N2_Fan_Stand_v1.0.1.zip The fan could still be about 3-4mm closer to the heatsink while lowering the overall stance of the design by the same amount. The extra height may allow a regular 40mm x 10mm fan to fit, which was my intent. As most people know, the actual thickness of a 40mm x 10mm fan can vary from one manufacture to another and the height will most likely need to be adjusted accordingly based on the fan chosen. A small hole drilled next to the rj-45 connection allows the fan wires to be cleanly passed through the case to the fan connector. This is important because I want to take a look at how the enclosed case top effects heat retention. This has been one of the areas of discussion at other forums and an interest to me. It’s nothing a drill can’t solve but lets find out if it’s a problem first. Almost all of the tests I have seen so far for the N2 have been shorter tests of minutes to approximately an hour. I would also like to do some long run multi-day tests to try and push the N2 to its limit.
Once everything was assembled and running, I started to examine what setup and control there was on the N2. I did find 2 thermal zones with 4 trip zones each:
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hominoid@odroid-n2:/sys/devices/virtual/thermal/thermal_zone0$ cat trip_point_0_temp 65000 hominoid@odroid-n2:/sys/devices/virtual/thermal/thermal_zone0$ cat trip_point_1_temp 75000 hominoid@odroid-n2:/sys/devices/virtual/thermal/thermal_zone0$ cat trip_point_2_temp 95000 hominoid@odroid-n2:/sys/devices/virtual/thermal/thermal_zone0$ cat trip_point_3_temp 110000 hominoid@odroid-n2:/sys/devices/virtual/thermal/thermal_zone1$ cat trip_point_0_temp 60000 hominoid@odroid-n2:/sys/devices/virtual/thermal/thermal_zone1$ cat trip_point_1_temp 75000 hominoid@odroid-n2:/sys/devices/virtual/thermal/thermal_zone1$ cat trip_point_2_temp 85000 hominoid@odroid-n2:/sys/devices/virtual/thermal/thermal_zone1$ cat trip_point_3_temp 110000
I then tried:
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$ sudo apt install lm-sensors $ sudo sensors-detect # sensors-detect revision 6284 (2015-05-31 14:00:33 +0200) # Kernel: 4.9.162-18 aarch64 # Processor: (//) This program will help you determine which kernel modules you need to load to use lm_sensors most effectively. It is generally safe and recommended to accept the default answers to all questions, unless you know what you're doing. Some south bridges, CPUs or memory controllers contain embedded sensors. Do you want to scan for them? This is totally safe. (YES/no): YES modprobe: FATAL: Module cpuid not found in directory /lib/modules/4.9.162-18 Failed to load module cpuid. Silicon Integrated Systems SIS5595... No VIA VT82C686 Integrated Sensors... No VIA VT8231 Integrated Sensors... No AMD K8 thermal sensors... No AMD Family 10h thermal sensors... No AMD Family 11h thermal sensors... No AMD Family 12h and 14h thermal sensors... No AMD Family 15h thermal sensors... No AMD Family 16h thermal sensors... No AMD Family 15h power sensors... No AMD Family 16h power sensors... No Intel digital thermal sensor... No Intel AMB FB-DIMM thermal sensor... No Intel 5500/5520/X58 thermal sensor... No VIA C7 thermal sensor... No VIA Nano thermal sensor... No Lastly, we can probe the I2C/SMBus adapters for connected hardware monitoring devices. This is the most risky part, and while it works reasonably well on most systems, it has been reported to cause trouble on some systems. Do you want to probe the I2C/SMBus adapters now? (YES/no): YES Sorry, no supported PCI bus adapters found. Sorry, no sensors were detected. Either your system has no sensors, or they are not supported, or they are connected to an I2C or SMBus adapter that is not supported. If you find out what chips are on your board, check http://www.lm-sensors.org/wiki/Devices for driver status.
1. Is there a kernel driver loaded by default or available yet?
2. What HW is represented by thermal zone 1 and thermal zone 2?
3. Are all 4 thermal trip points used for each thermal zone?
4. Is the fourth trip zone for thermal shutdown?
5. Is or will /sys/devices/platform/pwm-fan be used and if not what then?
Once I get everything configured and running, I’ll start some testing. Almost there...