rellla changed the topic of #linux-sunxi to: Allwinner/sunxi /development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi - *only registered users can talk*
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<prefixcactus> does no cpufreq on R40 mean that there's no throttling either?
<prefixcactus> does no cpufreq on R40 mean that there's no throttling in mainline either?
<apritzel> prefixcactus: the CPU is running at a constant, presumed safe frequency
<prefixcactus> Can I be sure it really is safe?
<prefixcactus> or is it a case of chinese roulette?
<KotCzarny> if you are not sure, add heatsink and a fan
<KotCzarny> and stop worrying
<apritzel> prefixcactus: you can just put some load on it, and measure the temperature
<prefixcactus> That's where the question came from, actually
<prefixcactus> We got it to 102°
<KotCzarny> is that C or F ?
<prefixcactus> C
<KotCzarny> nice
<apritzel> prefixcactus: what is the frequency?
<prefixcactus> thing is, it's gonna sit on the roof of a tractor under the sun, so we can expect quite a bit more
<prefixcactus> apritzel: 1008M
<KotCzarny> you should definitely add hs+fan before mounting
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<apritzel> prefixcactus: how did you measure the temperature? using the internal sensors? or with a actual thermometer?
<prefixcactus> the former
<apritzel> not sure how accurate this is, there is a comment in the r40.dtsi: /* TODO: add nvmem-cells for calibration */
<wens> at least put a large passive heatsink on it
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<apritzel> prefixcactus: you can try to lower the frequency, by defining SYS_CLK_FREQ in U-Boot's .config
<apritzel> the A20 uses 912 MHz (the value should be dividable by 24 MHz), apparently the R40 inherited the 1008 MHz from the other sun8i chips
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