mnemoc 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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<mtaubert> hi
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<cybin> i've found the module hdmi_cec in drivers/video/sunxi/hdmi. is that what i need to get cec support for a20 based boards? how do i use that module after loading?
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<xshock> in the logs of this channel i have found references to Allwinner F1C100 chip, and someone named amx got some code running on it. Does anything have any information about F1C100 and where I should start digging about it?
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<ddc> F-series processors From 2007 to 2011, Allwinner introduced its F-series processors, F10, F13, F18, F20, F1E200, F1C100, F20. This series runs Allwinner's self-developed operating system Melis2.0, which is now mainly used in vehicle multimedia system, E-ink reader, Visual intercom system etc.
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<rellla> uh. A33 was new to me. is this kind of a Mali'd A31?
<rellla> ah ok. thanks rm. sounds promising.
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<rellla> oliv3r: release date august/14 ... :p
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<JohnDoe_71Rus> how do you find the test points for tx rx?
<libv> JohnDoe_71Rus: there's a full howto on that on our wiki
<libv> JohnDoe_71Rus: have you tried looking at it?
<JohnDoe_71Rus> libv: UART How to?
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<libv> yes
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<JohnDoe_71Rus> so test each pads
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<ssvb> oliv3r: are you in the office? running the reliability/overheating tests on the a10-lime now? ;-)
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<rellla> ssvb: does it make sense what i wrote about g2d bug?
<oliv3r> ssvb: i have built my setup!
<oliv3r> ssvb: but got cought up in work, as always
<ssvb> rellla: yes, to some extent
<oliv3r> but wait and see ssvb :p
<ssvb> oliv3r: thanks, looking forward to the exciting results :)
<oliv3r> busy installing ruby :(
<ssvb> oh, is it that difficult?
<oliv3r> well your cjpeg test needs ruby :p
<oliv3r> there
<ssvb> ruby should be already properly packaged in every self respecting linux distro
<ssvb> cool picture, you are indeed well prepared :)
<oliv3r> alternative power suppply :p
<oliv3r> also, ruby wasn't on fedora 19 :p
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<ssvb> oliv3r: is ruby really not available in fedora 19? https://ask.fedoraproject.org/en/question/28270/ruby-193-on-fedora-19/
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<ssvb> oh, or maybe these slowpokes did not bother to compile it specifically for arm?
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<oliv3r> i can install it via yum though
<ssvb> ok, go for it :)
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<oliv3r> did that :p
<oliv3r> but i forgot to add userspace governor
<hypno> -s 0x100000
<hypno> oops
<hypno> oliv3r: looks like some fun measurements. why are you doing them?
<oliv3r> need to know how hot the board gets when built in
<oliv3r> hmm, 55 C now after a reboot, but temp1 is still 86.7
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<cybin> how do i trigger hdmi_cec_task_loop()?
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<ssvb> oliv3r: it is also very interesting to check if different a10 boards can use the same calibration settings for the temperature sensor
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<oliv3r> ssvb: well the FLIR cam should be highly accurate
<ssvb> oliv3r: that's cool, one problem is that there is some difference between the case temperature (you are measuring this) and the junction temperature (the temperature sensor is likely measuring this)
<ssvb> but hopefully the Psi-JT value is small enough and can be ignored
<oliv3r> seems to correlate quite linearly though
<oliv3r> right, first the jpeg test
<ssvb> if we look at the tables from that article, Psi-JT is listed to be between 0.5 and 1.0 C/W (for 5 watts power consumption it would be 5 degrees difference at most)
<oliv3r> 1008 MHz ............................ FAILED
<oliv3r> heh
<oliv3r> 960 and lower works fine :)
<oliv3r> so i'll downclock as the first step
<oliv3r> we need to be 100% stable
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<ssvb> oops, so your lime behaves exactly as mine
<oliv3r> yeah
<oliv3r> even if this happens only 1/1024 times, it's 1 to many
<oliv3r> so 960 Mhz is the new default for our boards :p
<oliv3r> kinda explains why they might use that as a default clock for the A20 :)
<ssvb> these are the safe voltages for reliable operation of 'sun4i_poorlime' on the plot
<oliv3r> this is default vcc btw
<oliv3r> ssvb: you mean you are working on that? nice
<oliv3r> so running at v1.4 volt
<ssvb> the plot shows that the 'cruise' speed for a10-lime seems to be around 864MHz, after that point increasing the clock speed needs large increases of the core voltage
<hypno> what are your requirements for reliable operataions?
<ssvb> oliv3r: however if you read that discussion thread fro mthe linux-sunxi mailing list, we suspect that the A10-Lime PCB may just have an unusually high voltage drop on the power line between the PMIC and the SoC
<ssvb> oliv3r: because my Cubieboard1 and Mele A1000 with the same A10 SoC both passed this test at 1.4V and 1008MHz
<ssvb> oliv3r: if you can confirm that more than one A10-Lime consistently fail the test, then this is a pretty much good explanation
<ssvb> hypno: the plot from my link just shows the minimum core voltage needed to pass the cpufreq-ljt-stress-test test from https://www.mail-archive.com/linux-sunxi@googlegroups.com/msg04411.html
<ssvb> hypno: the blue (sun4i), orange (sun5i) and brown (sun7i) lines show the default cpufreq operating points, which are hardcoded in the linux-sunxi kernel sources
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<ssvb> hypno: the cyan line (the practical test results from my A10-Lime) going higher than the blue line (default sun4i cpufreq settings) means reliability troubles
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<ssvb> hypno: what kind of hardware do you have? are you interested to running some tests on it?
<oliv3r> ssvb: ok i got 8 lime's here, let me test them in turn
<ssvb> oliv3r: if you confirm the problem on more than one A10-Lime, then we might probably want to talk with Tsvetan and ask about the power line resistance on the A10-Lime PCB
<oliv3r> rgr
<oliv3r> testing it now
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<ssvb> the fix would be to just increase the core voltage to compensate the excessive voltage drop
<ssvb> which would also require us to tailor the cpufreq tables specifically for each device
<oliv3r> which would suck, better fix the pcb :p
<oliv3r> but where exactly is the voltage drop happening?
<ssvb> well, it's the elementary physics :) you have the wire between the AXP chip and the A10 chip used to supply power, and it has some resistance
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<oliv3r> hmm, this LIME does work at 1008
<ssvb> the voltage drop on this wire is the current multiplied by this resistance
<oliv3r> aye
<oliv3r> so the wire causes the voltage drop?
<wens> correct
<ssvb> the higher is the current (on heavy CPU load), the higher is the voltage drop on the wire, so the SoC is in fact getting less than 1.4V
<oliv3r> ah a PCB wire
<oliv3r> they should fix that in rev D
<oliv3r> but this lime works
<oliv3r> not sure if its temperature / PSU related
<oliv3r> i power via OTG now
<ssvb> well, just try it on more devices
<ssvb> in any case, if the test fails, this means that the device is unreliable in these conditions
<ssvb> or maybe somebody could run the test on more A10 based devices, it could be not A10-Lime PCB specific after all
<ssvb> I got 1 fail out of 3 Allwinner A10 devices
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* lioka has pair of hackberrys at home
<lioka> ssvb: interested ?
<ssvb> sure
<lioka> ssvb: do you have some howto somewhere ?
<ssvb> lioka: just this message in the mailing list - https://www.mail-archive.com/linux-sunxi@googlegroups.com/msg04411.html
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<ssvb> but it should be added to http://linux-sunxi.org/Hardware_Reliability_Tests
<oliv3r> git clone ssvb:cpuburn; ./cpufreq-cjbsomething
<oliv3r> :p
<ssvb> but first install git, ruby and libjpeg-turbo ...
<ssvb> and enable the userspace governor in the kernel
<ssvb> I see that this already sounds complicated enough to discourage people :)
<oliv3r> it builds libjpegturbo by itself :)
<ssvb> right
<ssvb> has it done this for you?
* ssvb thought that fedora was one of the first distros to switch to libjpeg-turbo
<lioka> ruby. ohnoez
<ssvb> why not? it's a nice universal programming language, very useful for fast prototyping
<ssvb> I'm actually seriously considering to switch to mruby, because it allows to build static programs with no dependencies
<oliv3r> ssvb: it did, v 1.3 something
<oliv3r> python!! :p
<ssvb> meh
<ssvb> python typically needs more code to do the same job compared to ruby, and python also has weird indentation rules
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<ssvb> at least this was my impression when I made the choice between these two languages :)
<oliv3r> :p
<oliv3r> ssvb: the failed lime is a revA
<oliv3r> the working (so far) lime's are lime-4gb revC
<ssvb> oliv3r: ok, mine is also revA, maybe Tsvetan has already fixed this issue :)
<ssvb> do you have any other revA boards?
<hypno> ssvb: informative, thanks
<hypno> ssvb: i have an unused cubietruck (A20) i'm planning to fiddle with
<hypno> i'm more of an hardware guy so i don't know too much of which stability test sw's for linux is any good for actual usage
<hypno> i just remember from when i used to overclock computers a thousand years ago that most stress test softwares either didn't load the hardware enough or handled errors too well
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<hypno> so i am a but wary of using stress tests for evaluating clock and vcore settings
<hypno> bit|
<hypno> "
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<oliv3r> ssvb: nope, the revA board was an old freebe
<oliv3r> i never used it until now :p
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<lioka> ssvb: it would be nice to put back original governor, btw
<ssvb> lioka: you are right, thanks
<ssvb> got any results?
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<lioka> ssvb: nope, not at home currentry
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<wens> mripard: for some unknown reason, I'm getting 2 copies of _some_ of your at91 patches
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<mripard> wens: you don't want to know the reason ... :)
<oliv3r> ssvb: so far 4 LIME-4G revC have passed the test
<oliv3r> mripard: you made a pboboo!
<ssvb> oliv3r: ok, so far looks like only revA boards are defective
<oliv3r> yep up to 6 now
<ssvb> do you have any revB?
<oliv3r> nope
<oliv3r> maybe olimex can run this test and see what's up with several rev A, B and well not C boards
<ssvb> I have also checked the schematics for revA, revB and revC for the ZQ resistors, and they are different everywhere!
<oliv3r> i noticed that with an SD card, it's very easy to test
<oliv3r> just log in, run test, log out, swap sd, repeat
<oliv3r> well the jpeg decode test fails due to l2 cache problems no?
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<ssvb> well, the L2 cache is the component that apparently fails, and it likely fails because of the insufficient core voltage, and the voltage is likely insufficient because of the voltage drop on the power line between A10 and AXP
<oliv3r> wens: how is USB OTG power going IN to the board?
<oliv3r> does that go through the AXP?
<wens> oliv3r: through the AXP, and some bypass channel (through a diode) for 5v power to stuff like sata and usb
<wens> i feel like i've memorized the layout :|
<ssvb> A10-Lime revA (SZQ=330ohm, ZQ=237ohm), A10-Lime revB (SZQ=430ohm, ZQ=430ohm), A10-Lime revC (SZQ=330ohm, ZQ=330ohm) - everything is different!
<wens> mripard: about ahb1 needing to be clocked from pll6 for dma, i remember a series for default clock parents in dt?
<wens> maybe that would work, though i don't know if the series was merged or not
<oliv3r> wens: in that case, on the LIME layout :p; there's 5VEXT that goes into the ACIN of the AXP
<oliv3r> and the USB, SATA etc line is called 5V
<ssvb> oliv3r: looks like we have a big trouble for the DRAM settings calibration on A10-Lime :(
<oliv3r> i shorted out 5V_E to connect 5VEXT and 5V together
<mripard> wens: no, it's not merged yet iirc
<oliv3r> ssvb: how so?
<oliv3r> ssvb: each board is different, so should be treated as individual boards
<ssvb> oliv3r: the ZQ calibration resistors are all different and deviate from the 240ohm DDR3 standard
<ssvb> oliv3r: the DRAM settings tuned for revA would work poorly on revB/revC, and the other way around
<oliv3r> so each board needs its own ram tunings then
<oliv3r> so A10-OLinuXino-lime does not exist!
<oliv3r> it is A10-OLinuXino-lime-revA, B and C
<wens> oliv3r: the lime doesn't seem to have that bypass
<oliv3r> wens: be more specific?
<oliv3r> cause I shorted out those blobs on my lime :p
<oliv3r> but i cna't use USB OTG for power, I think
<oliv3r> which is acceptable
<oliv3r> ssvb: all 8 revC boards run fine
<wens> i have no idea what blobs you shorted out
<wens> let me get my patches out and i'll get back to you
<oliv3r> no rush
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<wens> ok, so there is no direct connection from OTG vbus to +5V on the lime
<wens> however, axp output is connected to a boost converter, which would output +5V for you if you're using the battery or otg
<wens> you probably won't have enough power to run a sata disk over otg through the axp though
<wens> axp limits current through vbus to 900mA by default
<wens> and that's assuming your source doesn't limit it
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<ssvb> oliv3r: can you check the current draw for the "lima-textured-cube + cpuburn-a8" test with your lab power supply?
<ssvb> oliv3r: and compare with the voltage/current, reported by the AXP
<oliv3r> ssvb: tomorrow! :p
<ssvb> oliv3r: ok :)
<oliv3r> i just solderd a revC board just now
<oliv3r> so ican connect it via my alternate power supply method
<oliv3r> i do'nt wanna test and waste time on the revA
<oliv3r> it has to be downclocked, so it's not valid for us any lnger
<oliv3r> wens: if you look at that image i linked
<oliv3r> wens: i removed FET1 and FET2
<oliv3r> and shortened 5V_E and 5V_SATA_PWR
<oliv3r> and feed power in via the sata power connector
<oliv3r> so if I do not connect that, and feed power in via the OTG, it looks like that no longer works, which is ok any maybe expected
<oliv3r> just don't understand why
<oliv3r> ssvb: all 8 revC boards pass the test
<wens> oliv3r: the image has a really low resolution :(
<oliv3r> really?
<wens> anyway i have the pdfs for the lime
<oliv3r> looks pretty big here? press the zoom?
<oliv3r> but look at the purple line mostly/only
<oliv3r> and at what the orange line points at :)
<oliv3r> the red lines just show what is removed
<wens> nope, small as hell
<oliv3r> is like 1280x1024 at least here
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<oliv3r> opening via the site even
<wens> mine is 180x177
<oliv3r> sounds like some weird thumbnail
<oliv3r> heh, its .png and the content is jpeg
<oliv3r> wget pulls it in though
<oliv3r> firefox renders it normally though
<oliv3r> so does chrome
<oliv3r> if i download it via wget, rename it to jpg, eog shows the proper res too
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<oliv3r> ssvb perfect 5V in, 0.3 amps idle
<oliv3r> running jpeg test @ 1008 mhz is 0.48 amps
<oliv3r> i'll do the rest in a table withtemps tomorrow
<wens> well according to the board designs, you really didn't have to do that
<wens> but it's possible exten wasn't enabled, thus you're not getting boosted 5v from ipsout
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<wens> but then you wouldn't have 3.3v either
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<oliv3r> i don't follow, but i gotta catch a train
<oliv3r> talk to oyu later
<oliv3r> maybe scrollback to see my earlier screenies to see what i did (with the heat camera shots)
<wens> the pages are still small, maybe the service doesn't like me
<wens> anyway, bedtime, talk tomorrow
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<lioka> ssvb: 1056 and up skipped, 1008 and down all ok
<ssvb> lioka: looks good
<ssvb> technically, you can unlock higher clock frequencies via something like "echo 1008000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq" (use a higher clock frequency instead of 1008)
<ssvb> just to see where it fails :) or don't do this if you don't like the idea of overclocking for testing purposes even for a short period of time
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<lioka> ssvb: out of around ten runs: 1152 alwais fails within 1-5 dots, 1104 all ok
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