#linux-sunxi on 2021-04-07 — irc logs at freenode.irclog.whitequark.org

2018-08-03 10:18 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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09:01 <prefixcactus> does no cpufreq on R40 mean that there's no throttling either?

09:01 <prefixcactus> does no cpufreq on R40 mean that there's no throttling in mainline either?

09:02 <apritzel> prefixcactus: the CPU is running at a constant, presumed safe frequency

09:08 <prefixcactus> Can I be sure it really is safe?

09:08 <prefixcactus> or is it a case of chinese roulette?

09:08 <KotCzarny> if you are not sure, add heatsink and a fan

09:09 <KotCzarny> and stop worrying

09:13 <apritzel> prefixcactus: you can just put some load on it, and measure the temperature

09:14 <prefixcactus> That's where the question came from, actually

09:14 <prefixcactus> We got it to 102°

09:14 <KotCzarny> is that C or F ?

09:14 <prefixcactus> C

09:14 <KotCzarny> nice

09:16 <apritzel> prefixcactus: what is the frequency?

09:16 <prefixcactus> thing is, it's gonna sit on the roof of a tractor under the sun, so we can expect quite a bit more

09:16 <prefixcactus> apritzel: 1008M

09:16 <KotCzarny> you should definitely add hs+fan before mounting

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09:19 <apritzel> prefixcactus: how did you measure the temperature? using the internal sensors? or with a actual thermometer?

09:19 <prefixcactus> the former

09:25 <apritzel> not sure how accurate this is, there is a comment in the r40.dtsi: /* TODO: add nvmem-cells for calibration */

09:30 <wens> at least put a large passive heatsink on it

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09:40 <apritzel> prefixcactus: you can try to lower the frequency, by defining SYS_CLK_FREQ in U-Boot's .config

09:41 <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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