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<ssvb>
oliv3r: sorry, was a bit AFK during the last few days
<ssvb>
oliv3r: what did you want?
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<thecom>
hi there, i've a problem with my hackberry a10 using archlinuxarm. usb does not seem to work, hubs are listed by lsusb, but no devices are recognized if plugged in.
<Tsvetan>
now we have so powerful SoC/boards that can put them in such toys and make amazing things
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<nieuwbie>
hey. anybody is using gentoo?
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<Turl>
server looks completely down :(
<Turl>
not much I can do other than try to ping mnemoc
<ssvb>
Turl: is it regularly backed up?
<Turl>
I'm under the impression it is, but you'd need to ask mnemoc
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<ssvb>
Turl: it would probably make sense to have backups distributed among more than one person
<Turl>
ssvb: indeed
* ssvb
is just being paranoid and scared of the idea that linux-sunxi.org might be not coming back
<lukas2511>
are there any backups? :D
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<Turl>
hetzner was having outgoing DDOS problems hm.. maybe related
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<gzamboni>
ssvb i do a rsync of the files every day but i dont backup the database
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<dack>
anyone online have a CS918S?
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<libv>
dack: when our wiki is back up, please work the CS918S page
<dack>
libv: work? I don't have one, but was thinking about getting one. Just wondering what they were like. I looked at the cached copy of the wiki page and saw there wasn't much there.
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<libv>
dack: it's a31s so we have little actual support for it
<libv>
you're pretty much in chartered territory, and it would be nice if someone would go and properly works this SoC
<libv>
jsmirl seems only interested in throwing tons of questions to our ml
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<Zboonet>
I want to build an image for the A20-OLinuXino, can I use the HEAD revision or do I have to roll back in previous commit (git reset --hard) for building the u-boot and kernel ?
<libv>
this sunxi server being unavailable is becoming old :(
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<oliv3r>
ssvb: where are you! :(
<oliv3r>
libv: looks like all of mnemocs virtual machines went down
<ssvb>
oliv3r: I'm here, and I pinged you several hours ago
<oliv3r>
ssvb: i have many exciting and terrifying news things for you :p
<oliv3r>
you got a few minutes?
<ssvb>
yes, sure
<oliv3r>
ok i did a few days worth of temperature measuring :)
<oliv3r>
(all on a lime-4g)
<oliv3r>
i used a thermal camera, and today I started to use a thermocouple
<oliv3r>
while the camera is really good, i'm not sure how accurate the measured temperature is
<oliv3r>
so for one, with an ambient temperature of 23C, humidity of 65%, the internal temperature sensor measured 104.5C, the IR camera 90.0C and the thermocouple 79.0C
<oliv3r>
now this was on a lime that performed really really well, the IR camera was able to go upto 115C before the board finally crash the other day with an ambient temp of 30C
<oliv3r>
now, the biggest problem i have found so far, when we had a 30C ambient temp, none of the lime's would burn for longer then 15 minutes
<oliv3r>
all would overheat
<oliv3r>
i got a small 19mmx19mmx12mm heatsink with thermal tape on one, but that doesn't seem to help a whole lot
<oliv3r>
it does help, on a nother one, i glued a 22mmx22mmx22mm heatsink with thermal glue, which seemed to work quite well, but i haven't tested that one yet
<oliv3r>
so 1) the datasheet doesn't mention the junction to case temperature values or anything
<oliv3r>
2) can your lime run at full burn for prolonged time (and what temperature do you get?)
<oliv3r>
3) a20 seems to run 30% less hot (30% lower power requirement) but has a maximum of only 70C vs 85C of the a10 (according to the datasheet)
<oliv3r>
i did verify the thermocouple against a PT100 in boiling water and the thermocouple was spot on
<ssvb>
the whole idea is that the cpu clock speed should be throttled after reaching dangerous temperature
<oliv3r>
thinkpad <3
<oliv3r>
4) I did a whole lot of meauring (and will do more on a different board with the thermocouple this time) to get the temperature / die-diode profile
<oliv3r>
but I would have expected that since absolutly noone uses a heatsink (tablets etc) and the olimex even goes into a claustrophobic case
<oliv3r>
the a10 wouldn't ever get that hot
<oliv3r>
i don't have an image of the used heatsink :S
<ssvb>
basically, we need to 1) calibrate the temperature sensor, so that it reports reasonable results 2) implement emergency throttling, based on periodic monitoring of the temperature
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<ssvb>
if you want a reliable system here and now, you may consider downclocking your devices
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<ssvb>
oliv3r: absolutely noone uses a heatsink just because they don't care
<libv>
i think it might just be done using clipplanes
<oliv3r>
oh interesting
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<oliv3r>
yeah taht's absolutly something we could use when we start optimizing our engine
<oliv3r>
i think we will look at optimizing in about 6-12 months when the current version is deployed out in the field
<oliv3r>
libv: but we will not ship mali stuff, so we'd rely on lima
<oliv3r>
but wow, that stuff is REALLY fast
<oliv3r>
our slicer is far from that :(
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<libv>
slicing smells like a very straightforward gpu job
<oliv3r>
libv: yeah absolutly
<oliv3r>
our engine does a few more things of course, optimize the path, smooth lines etc etc, but the core is absolutly something we'd want to offload to the GPU
<ssvb>
oliv3r: if you don't mind destroying one device for the sake of science, you could try to increase the core voltage and check if the crashes at 85C disappear
<oliv3r>
i can do that :p
<oliv3r>
fex file + uboot changes right?
<oliv3r>
we can't do it dynamically
<ssvb>
not on a10
<oliv3r>
change to 1.5V?
<ssvb>
for a10 you need to patch the cpufreq table in the kernel sources
<oliv3r>
i got a testboard that has a small heatsink, so the 1.5V may hurt less
<oliv3r>
but it won't run stable at 1GHz either, 960Mhz (i'll know tomorrow, it should be still running)
<oliv3r>
ok i can do that, easy peasy
<oliv3r>
i'll try to remember tomorrow ):
<ssvb>
check the irc logs :)
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<ssvb>
unlike linux-sunxi.org they are still accessible :)
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<oliv3r>
:p
<oliv3r>
yeah but if i get too busy, i may forget :)
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<oliv3r>
sleep time now :)
<oliv3r>
nn ;)
<oliv3r>
got some charts done looks interesting
<oliv3r>
i don't get why the delta between sensor and case differge when the freq. rises though
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