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[00:01:02] * Topic is 'http://beagleboard.org/chat has a guide on how to ask questions and links to the logs | never ask to ask, just ask | be patient | pastebin a boot log | http://ahsoftware.de/Beaglebone_Black_Boot_explained.svg | http://beagleboard.org/latest-images | http://beagleboard.org/Support/bone101 | direct bonescript/node.js questions to #beagle-bonescript | books: http://bit.ly/bbb-books'
[00:01:02] * Set by KotH!~attila@erica.kinali.ch on Wed Jul 15 13:55:07 UTC 2015
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[00:01:17] <veremit> oh bugger .. missed him
[00:01:41] <zmatt> lol @ the name of this mailing list ... https://www.ietf.org/mailman/listinfo/dsfjdssdfsd
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[00:11:46] <zmatt> I do wonder why rcn-ee has a tendency to vanish like this
[00:12:03] <veremit> why he doesn't get have a bouncer...
[00:12:12] * vagrantc suspects it has something to do with work hours
[00:12:26] <veremit> yes thats quite obvious, and cutting himself off
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[00:15:12] <zmatt> wb rcn-ee
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[00:16:39] <veremit> ooo
[00:17:00] <veremit> lives close to work :D lol
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[00:17:46] <zmatt> bloooock.... lol, sorry, djb's fault
[00:18:48] <zmatt> (http://cr.yp.to/talks/2016.01.15/slides-djb-20160115-a4.pdf search for "Tor")
[00:28:28] <shevek> Is there any way to disable a cape? I need ttyO4 most of the time, but I also need to be able to switch it off.
[00:28:54] <veremit> peripherals aren't really designed to be dynamically turned on and off
[00:29:02] <zmatt> sure they are
[00:29:13] <veremit> zmatt; well perhaps you can advise
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[00:29:21] <shevek> I don't need to switch the port off, but I need to be able to use the pins as GPIO.
[00:29:24] <zmatt> drivers might not be, that's not the same as peripherals not being :P
[00:29:36] <veremit> zmatt: this ain't a micro :P~ that's very easy
[00:29:46] <zmatt> though using an overlay and unloading it should work
[00:29:57] <zmatt> (unless it doesn't and results in a kernel panic instead)
[00:29:57] <shevek> How do I unload an overlay?
[00:30:35] <zmatt> if you're using bone_capemgr then no idea, I only know the new configfs mechanism
[00:31:09] <shevek> Hmm, too bad. And if I write my own overlay, is it possible to do it in a way that it can switch between them somehow?
[00:31:32] <zmatt> unload one, load the other
[00:31:45] <shevek> I mean switch between pin functions.
[00:32:12] <zmatt> yes
[00:32:13] <veremit> echo <blah> > capemgr.slots
[00:32:45] <zmatt> veremit: you can't load two overlays with conflicting pins though, so you first need to unload the previous one
[00:33:10] <veremit> I'm sure the cape_mgr will balk :p
[00:33:26] <veremit> and there is a load/unload interface on capemgr
[00:33:37] <shevek> Yes, it does. And I have not found a way to unload a cape, except by rebooting.
[00:33:48] <shevek> There is? How does it work?
[00:34:05] <veremit> well .. it must be similar syntax
[00:35:01] <zmatt> I vaguely recall there is, but don't remember the details
[00:35:42] <maxbots|mtw> Hey folks, have a question. In the book "Exploring BeagleBone", the author suggests that you can "destroy" your beaglebone by removing power without shutting down. That sounds like hyperbole to me.
[00:36:02] <maxbots|mtw> Can you actually do physical damage, or is it just the possibility to corrupt the image?
[00:38:15] <zmatt> there is some minor concern of damage since it drops the supply rails to the cpu too fast and without regard to proper sequencing
[00:39:15] <zmatt> I mostly try to do clean shutdowns out of concern of the image though (I have seen fs corruption due to casual use of the reset button)
[00:39:56] <maxbots|mtw> So unlikely that there would be hardware damage, but not impossible
[00:40:38] <veremit> https://github.com/jadonk/validation-scripts/tree/master/test-capemgr
[00:40:43] <veremit> second half of that page
[00:40:52] <zmatt> right, and a clean shutdown isn't that clean either since the braindead tps65217 switches to battery power at the start of the powerdown sequence, regardless of whether a battery is present, leaving the system to run on caps during powerdown
[00:41:53] <maxbots|mtw> kk
[00:42:24] <veremit> shevek ^^ that page .. echo "-X" > slots
[00:42:24] <maxbots|mtw> And I assume the system is not smart enough to detect the loss of power and start shutdown automatically
[00:43:06] <zmatt> tps will initiate powerdown on detecting undervoltage, but it doesn't have time to do so
[00:43:32] <shevek> veremit: Thanks!
[00:43:41] <zmatt> for reference, this shows a shutdown: http://elinux.org/File:Bbb-c-3v3u-shutdown-dc5v-hdmi.png
[00:43:44] <maxbots|mtw> How long do the caps keep it active after power loss?
[00:43:46] <veremit> not sure whether that really works .. but hey
[00:43:46] <zmatt> vs cutting power: http://elinux.org/File:Bbb-c-3v3u-powercut-hdmi.png
[00:44:06] <maxbots|mtw> thx zmatt
[00:45:26] <zmatt> (this is actually a slightly patched bbb, but I'm not sure whether I have any useful pics of an unpatched one... I don't expect a big difference)
[00:45:58] <shevek> Hmm yes. The kernel doesn't like it, as predicted.
[00:47:00] <zmatt> mind that if you have multiple overlays loaded, you can only unload them in reverse order... you can't remove one from the middle of the stack
[00:47:55] <shevek> Ok, that's good to know.
[00:54:16] <shevek> Hmm, it doesn't seem like I can unload the top of the stack either; the board just crashes. :-(
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[00:55:38] <zmatt> yeah not all drivers are too fond of runtime changes to the device tree
[00:56:09] <zmatt> what kernel version are you running?
[00:58:10] <shevek> 3.8.13-bone71.1
[00:58:41] <zmatt> ah, an ancient kernel, that probably also doesn't help
[00:59:28] <shevek> I suppose it doesn't. I would like to avoid upgrading though, but I can if I have to.
[01:00:16] <shevek> (The reason is I want to put this on many boards, and upgrading all of them would take a lot of time.)
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[02:09:56] <kremlin> hi -- does anyone know where the official device tree compiler source is? everything on github seems to be a fork
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[02:36:49] <wmat> kremlin: git clone git://git.kernel.org/pub/scm/utils/dtc/dtc.git
[02:37:18] <wmat> kremlin: http://www.devicetree.org/Device_Tree_Compiler
[02:37:34] <kremlin> wmat: thanks!
[02:39:07] <veremit> wmat: does that one work, I had a feeling there was a patch needed .. and hence rcn-ee's version ?
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[02:40:24] <wmat> veremit: no idea, just providing the official dtc source as asked
[02:40:32] <veremit> wmat: okies :D
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[02:44:07] <kremlin> it ended up being installed as part of the bb.org-overlays repo
[02:47:27] <veremit> yea mighta found its way to /opt possibly
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[02:47:41] <kremlin> that is where it *usually* is but im using the minimal debian image
[02:47:56] <kremlin> and it seems to lack it + some other things it probably shouldn't lack
[02:48:08] <veremit> ah rn's eewiki site? or another?
[02:48:26] <veremit> the console image is pretty bare
[02:48:54] <kremlin> rcn-ee one
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[02:49:01] <veremit> unfortunately there isn't a lot of 'middle ground' its everything or nawt. Although he did say where his build script was once ...
[02:49:07] <kremlin> it comes with curl and wget but not file or make..
[02:49:11] <veremit> you could tweak that and rebuild one
[02:49:24] <veremit> apt-get install file make <etc>
[02:49:30] <kremlin> i know that :P
[02:49:35] <veremit> hehehe
[02:49:47] <kremlin> it just seems odd to include wget/curl but not `file`
[02:50:47] <veremit> oh wow .. nailed it .. https://github.com/RobertCNelson/omap-image-builder
[02:51:28] <veremit> I guess it depends what you use regularly
[02:53:06] <kremlin> `file` is pretty up there in usage :)
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[02:53:20] <veremit> can't say I've used it .. but I'm no guru/hacker :P lol
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[03:00:08] <kremlin> `man` is missing too
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[03:03:05] <veremit> nooo .. I won't have it ..
[03:03:16] <veremit> thats daft!
[03:03:44] <veremit> althouguh .. trimming out the man pages too .. thats gonna be a small image .. lol ..even if they're bzipped
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[03:07:14] <kremlin> not really
[03:07:16] <kremlin> # du -sh /usr/share/man
[03:07:19] <kremlin> 16M /usr/share/man
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[03:21:28] <veremit> crikey lol
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