Turl 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
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<premoboss> someone tried openwrt on cubieboard A20?
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<bpiuser> Hi. Has anyone tried Linux 4.1 (any rc) on an Allwinner A20 board?
<bpiuser> I've been using 4.0 without problems. Now I tried 4.1-rc8
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<bpiuser> But even though the configuration is essentially the same, I ran in to a problem.
<bpiuser> My syslog gets spammed with messages over "clocksource hstimer"
<bpiuser> The messages look like this:
<bpiuser> Jun 20 04:32:59 BPI kernel: [ 7.536524] clocksource hstimer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 21718868714 ns
<bpiuser> It is also printed on tty1 when I connect the board to a HDMI screen (simple framebuffer)
<bpiuser> NiteHawk: Thanks: I already found that page, too. But CONFIG_GENERIC_CLOCKEVENTS is already enabled in my kernel.
<bpiuser> Well, I I don't know what "Use Tarball method by default" means here, but I assume it's not related to my issue... ?
<bpiuser> Apparently, I'm not the only one. If you google the meesage, you find a couple of sunxi (esp. cubitruck) users who seem to have these messages
<bpiuser> Do I have to change the clocksource manually or so?
<bpiuser> Or could it be that Linux 4.1 requires a newer U-Boot? (I use mainline U-Boot 2015.4)
<bpiuser> My board is a Lemaker Bananapi btw. Just in case anyone didn't get that from my screenname ;)
<NiteHawk> hmm. i don't think the u-boot should be involved with that. i'm running 4.0.5 with u-boot 2015.04, but haven't tried any 4.1 kernel yet...
<bpiuser> Yeah.. with 4.0.5 everything is good for me as well... but... let me just try something.
<bpiuser> Ok, that didn't help. I just checked if the default clocksource changes between 4.0.5 and 4.1-rc8. But it shows arch_sys_counter as the current clocksource for both kernels. Yet the messages seem to come from hstimer... weird.
<NiteHawk> dunno what's wrong there. the github issue points to a post to the linux arm-kernel mailing list, but the patches mentioned there seem to have gone into 4.1 already (https://git.kernel.org/cgit/linux/kernel/git/arm/arm-soc.git/log/drivers/clocksource/timer-sun5i.c)
<bpiuser> Hmmm.... Is timer-sun5i used on sun7i as well? I thought the only stuff reused on sun7i is from sun4i
<NiteHawk> i was wondering that too - but there's a CLOCKSOURCE_OF_DECLARE(sun7i_a20, "allwinner,sun7i-a20-hstimer",
<NiteHawk> sun5i_timer_init); at the end of that file
<bpiuser> I'm asking, since I have sun5i and sun8i architecture support deisabled in my config. So maybe I need to enable some sun5i stuff to get that working?
<bpiuser> I'll give it a try
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<bpiuser> Hmm... I'm recompiling now with sun5i arch support. But I doubt it will help because I noticed: even with sun5i arch support disabled, sun5i_hstimer is still selected... so this is turned on already.
<NiteHawk> yes, CONFIG_SUN5I_HSTIMER is responsible for that particular piece of code
<NiteHawk> you could try it the other way around and disable that, or alternatively remove the corresponding device node from the dts/dtb?
<bpiuser> But wouldn't that break cpufreq stuff?
<NiteHawk> good point - to be honest i have no idea
<NiteHawk> did you try if that message goes away when you disable cpufreq switching / set a fixed frequency?
<bpiuser> NiteHawk: I didn't before. but I just tried now. If I set the scaling governor to "performance" in rc.local, I still have a couple of these messages during bootup, but then they don't seem to popup anymore (obviously I haven't watched it for a long time now, but they are usually there immediately if I cause some load/activity on the system - which makes sense because in these cases cpufreq would increase the frequency within the s
<NiteHawk> yes, i would assume it's related to cpufreq transitions
<bpiuser> Could this be a bug that hasn't been discussed yet? Should I post to the mailing list?
<NiteHawk> interestingly i also found http://webcache.googleusercontent.com/search?q=cache:eEY4fhQu8JUJ:http://storage.kernelci.org/mainline/v4.0-10710-g27cf3a16b253/arm-multi_v7_defconfig%2BCONFIG_PROVE_LOCKING%3Dy/lab-tbaker/boot-sun7i-a20-cubietruck.html%2B%22clocksource+hstimer%22&gbv=1&hl=de&&ct=clnk - showing that this issue dates back to v4.0
<bpiuser> Yeah thats weird. The github page you linked also mentions 4.0.
<NiteHawk> i think it deserves further investigation, so bringing it up on the ML is probably a good idea
<bpiuser> I just don't know why I don't have that problem on 4.0 then.
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<NiteHawk> my impression is v4.0-10710-g27cf3a16b253 was a 'late' commit in the 4.0 series before moving to 4.1-rc0, so this issue might not have surfaces in the stable 4.0.5 yet
<NiteHawk> s/surfaces/surfaced/
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<bpiuser> Ok, so my recompiled kernel with sun5i support didn't help either.
<bpiuser> So, I guess I'll have to post to the mailing list.
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