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  • [00:00:39] * 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'
  • [00:00:39] * Set by KotH!~attila@erica.kinali.ch on Wed Jul 15 13:55:07 UTC 2015
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  • [03:43:53] * nyt yawns
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  • [04:18:05] <zmatt> morning nyt
  • [04:18:22] <nyt> night here ;) morning there?
  • [04:19:14] <zmatt> ah, well, timezones...
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  • [05:30:24] <zmatt> ....... the am57xx iodelay registers are not in the same order as padconf registers but are sorted by pin name (case-sensitive asciibetical order) -.-
  • [05:30:47] <zmatt> ok whichever TI engineer thought that was a good idea really needs to be slapped with a large trout
  • [05:32:40] <veremit> wait .. TI engineer WITH a good idea? .. really?
  • [05:33:02] <veremit> ok maybe that's a Bit harsh .. lol
  • [05:33:08] <veremit> its Monday morning .. bleh.
  • [05:35:11] <zmatt> actually the pin map is reasonably clean and consistent... amazingly the boundary scan cells are actually in the same order of the padconf registers ... well, reverse order, but that's normal. and ignoring the gaps of course due to some pads having padconf but not having boundary scan or vice versa
  • [05:35:34] <veremit> sounds reasonable
  • [05:35:42] <zmatt> and then came along iodelay
  • [05:36:08] <veremit> so you're unpicking the x15 already now?! :)
  • [05:36:23] <zmatt> which means first RMII_MHZ_50_CLK and Wakeup0-3 .. which are the only pins whose official name isn't all-lowercase, and then comes the rest of the pins
  • [05:36:44] <zmatt> https://docs.google.com/spreadsheets/d/1mSqEpV_BAUHfeNApytxHcGhgTZwypy564GyOr66Nphs/view
  • [05:39:38] <veremit> mm
  • [05:41:41] <zmatt> ETOOMANYMUXOPTIONS
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  • [05:51:20] <zmatt> I still need to try boundary scan "sample" on an am335x... afaik you're allowed to do that on a running system, and getting a near-instantaneous snapshot of all pins could be useful... for... something, probably
  • [05:51:53] <veremit> heh maybe
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  • [06:47:02] <pgeorge> Hi
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  • [10:04:30] <sanketnai> is there a way to use dev/mem file to access gpio in android os ?
  • [10:06:45] <av500> does /dev/mem exist?
  • [10:06:47] <av500> then yes
  • [10:07:25] <sanketnai> how?
  • [10:08:32] <sanketnai> when i try to access it through an android app via jni to c i get an error
  • [10:08:54] <sanketnai> indirect reference to 0x0000a0
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  • [10:14:55] <av500> does the same code work on linux?
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  • [10:31:33] <stt_michael> I'd imagine there would be a permission issue
  • [10:31:40] <stt_michael> ie. android won't let you
  • [10:33:30] <av500> maybe
  • [10:33:49] <av500> pastebinning some code and errors might have helped
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  • [11:21:12] <zmatt> stt_michael: then the dev simply wouldn't have existed I think
  • [11:21:51] <Rak_> I'm here to know the about IEC 61850 supported evaluation kits
  • [11:22:11] <zmatt> but people might overlook the need to be root (changing its perms doesn't work) and to open it with O_DSYNC and mmap it, not try read/write
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  • [11:24:45] <Rak_> can anybody help me to select beabgle board for IEC 61850 implementation
  • [11:25:38] <Rak_> I found it here http://www.ti.com/tool/TIDEP0019
  • [11:26:34] <stt_michael> hmm possibly
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  • [11:28:54] <zmatt> I should poke rcn-ee into including the modprobe.d and udev rules for uio... then all you need to do is add a DT node for the page(s) you want and voila, uio device appears
  • [11:29:11] <zmatt> safer than grabbing access to all of /dev/mem
  • [11:29:46] <zmatt> anyhow, afk
  • [11:30:31] <Rak_> Anybody could understand my need ?
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  • [12:08:24] <zmatt> veremit: aaaand another column added to my spreadsheet for *yet another* pin numbering used in the control module... -.-
  • [12:10:47] * agmlego|brigid is now known as agmlego
  • [12:11:54] <zmatt> seriously, how hard can it be to pick *one* way to number pins (zero-based, thank you) and use that consistently, argh
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  • [12:40:57] <roland> Hei,
  • [12:42:03] <roland> I am trying to read the analog inputs of my beaglebone, but I don't get useful values out of them. I. e. that for example AIN1 stays at 0 regardless of input voltage, AIN5 prints twice the input voltage, AIN0 fluctuates at 1800. How can I fix that, or what could be the reason for that behaviour?
  • [12:42:08] <roland> Thanks!
  • [12:43:34] <tbr> roland: make sure the pins are muxed properly. Also make sure to NEVER exceed 1.8V input
  • [12:44:14] <tbr> there is probably some virtual cape for that. IIO or sthg
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  • [13:23:43] <roland> @tbr: the max. input atm is <500 mV
  • [13:23:58] <roland> how do I make sure that the pins are muxed properly?
  • [13:24:14] <tbr> which kernel are you using?
  • [13:24:46] <roland> 3.8.13-bone50
  • [13:25:43] <roland> any newer kernel available?
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  • [13:33:51] <tbr> on that kernel you should be able to just insert the virtual cape
  • [13:34:24] <tbr> I'm sure a search, perusing the intertubes search engine of your least distrust, will yield some results on enabling BBB ADC and IIO
  • [13:35:49] <roland> well, I did that, and in the slots-file I can already see the io-virtual cape, but it does not change anything
  • [13:37:47] <tbr> I'd use the 1.8V ADC vref to poke all pins and see if that raises the value to around 4096
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  • [13:45:38] <roland> Well, if I am doing that, then I get the result (tested for AIN1 and AIN5): AIN1: Instant shutdown, AIN5: 1800
  • [13:46:23] <roland> Edit: The other way round, AIN5: Instant shutdown, AIN1: 1800 constant
  • [13:50:00] <tbr> that sounds weird
  • [13:50:10] <tbr> do you have anything else connected to the board?
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  • [14:05:05] <roland> @tbr: No, plain BBB, booted from µSD
  • [14:06:30] * idwer (~irc@unaffiliated/idwer) Quit (Ping timeout: 240 seconds)
  • [14:08:31] <stt_michael> zmatt, arm chips are fun eh?! ;P
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  • [14:27:14] <zmatt> stt_michael: "arm chips" ? :P
  • [14:28:33] <av500> arm chips sounds like the result of a tragic accident
  • [14:30:14] <rcn-ee> do they come with "dip"?
  • [14:31:11] <jkridner> hi zmatt
  • [14:31:32] <av500> jkridner: zmatt: fight!
  • [14:31:46] <zmatt> about?
  • [14:32:07] <jkridner> I'm not sure about Gerald's strategy on this one...
  • [14:32:17] <jkridner> or about what is fixed in PG2.0.
  • [14:32:19] <av500> jkridner: zmatt: can't we make a compromise?
  • [14:32:30] <av500> put the resistors, but only solder on one side?
  • [14:32:34] <jkridner> good to ask that on the list and have me ping some of the other TI folks on the list.
  • [14:34:40] <zmatt> jkridner: even though ethernet switch reset isolation has been officially defeatured, my experience is that you can get nearly the same effect simply by avoiding PHY resets
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  • [14:35:24] <zmatt> it just got tangled up with the whole turn-every-reset-into-POR thing
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  • [14:38:26] <zmatt> at the same time, if the current scheme has been well-tested then changing it to something less well-tested may perhaps not be worth the risk... I don't know...
  • [14:40:20] <zmatt> it seems straightforward when I originally hit the "send" button :P
  • [14:40:24] <zmatt> *seemed
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  • [14:44:10] <zmatt> jkridner: also, if you happen to come across the person responsible for not giving the iodelay registers the same order as the padconf registers, but instead sorting them *by pin name*, can you slap him/her with a trout for me? ;P
  • [14:45:15] <zmatt> afk for a bit, i'm getting pulled into a meeting -.-
  • [14:45:17] <jkridner> zmatt: hopefully they'll understand it is "from the community" :-)
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  • [15:19:13] <abferm> Anyone here use qemu to emulate the bone black? I'm trying to get it set up and am failing miserably
  • [15:20:37] <tbr> abferm: you can only sortakinda emulate the ARM core, all the other peripherals are not available
  • [15:21:49] <av500> what tbr said
  • [15:21:53] <av500> you can emulate the CPU core
  • [15:22:29] <abferm> I'm looking at linaro's fork of qemu, and they have a beagle target. I want to validate my software stack. I have a setup for mocking peripherals.
  • [15:25:06] <tbr> essentially any qemu-arm should work if you just want to boot userspace and don't have any peripheral dependencies
  • [15:25:32] <tbr> but nothing beats real hardware for testing
  • [15:25:44] <abferm> I keep getting this error...
  • [15:25:45] <abferm> qemu: fatal: Trying to execute code outside RAM or ROM at 0x402f0400
  • [15:26:40] <tbr> no idea
  • [15:26:58] <abferm> Yeah, we will be testing on hardware before anything goes out the door. I just wanted a quick way for our developers to test changes at their desk.
  • [15:28:24] <tbr> a BBB is what 40$ 50$? now account for slowwwwness of qemu. what is your break even per employee of providing them with 1, 2, 3 boards in a pool or 1 per person. ;)
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  • [15:33:30] <mdp> now account for bugs in the qemu bbb i/o model..
  • [15:34:09] <mdp> now account for gaps you must write sw to fill in the qemu bbb i/o model..
  • [15:34:31] <tbr> instant break even!
  • [15:35:34] <mdp> our developers test changes on x86 on their devel box..write portable code..and go to h/w next
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  • [15:41:53] <abferm> The reason we want to emulate is the ease of jumping back to a clean image.
  • [15:42:13] <tbr> NFS-root?
  • [15:44:09] <zmatt> abferm: 0x402f0400 is internal RAM
  • [15:44:35] <zmatt> 0x402f0400 - 0x4030ffff specifically
  • [15:45:29] <zmatt> you can probably declare to qemu that there be RAM there, but that's still only a miniscule part of the work of emulating an am335x
  • [15:46:17] <zmatt> a simple qemu-user + chroot environment doesn't suffice for your purpose I suppose?
  • [15:46:37] <tbr> at any reasonable rate, we've probably together spent more engineering time discussing this issue than a whole fleet of BBBs is worth by now ;)
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  • [15:47:39] <abferm> Yeah... I think I've found a solution. Going to try building a docker image with qemu-user-static injected into it.
  • [15:47:50] <zmatt> abferm: tbr's suggestion of nfsroot is also a good one
  • [15:48:49] <zmatt> or something with an overlayfs or so
  • [15:48:55] <tbr> and if you want to rapidly test kernels, load them via serial, but with sthg like 1MBaud
  • [15:49:25] <zmatt> wouldn't that still be much slower than using tftp?
  • [15:52:35] <tbr> in case of AM335x that could be true. I was thinking of av500's setup for OMAP1/3/4 etc which didn't have ethernet
  • [15:52:43] <zmatt> ah
  • [15:56:35] <mdp> yup, I just use a pristine nfsroot and clone those and have the benefits of real h/w
  • [15:58:05] <mdp> tbr, usb cdc ether works just as well
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  • [16:57:37] <Zsolt--> hello
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  • [17:01:46] <Zsolt--> I've a question about BBB. I've put together a system with two DC motors. The application works fine, the issue is when I'm turning on the BBB: during the booting phase the PWM signals are going high and the motors are running on full velocity. I've set up a relay that should enable and disable the pwm channels, but unfortunately the relay control pin has a same behaviour.
  • [17:02:38] * IrishGringo (~chatzilla@2601:586:c200:6eaa:523:a6fd:d54a:69d2) Quit (Ping timeout: 246 seconds)
  • [17:02:58] <Zsolt--> once the bootup is done, the PWM (and the relay controller pin) is behaving as I want. Same goes for powering off: once the system shuts down, at a certain point the PWM goes to high until the board powers down.
  • [17:03:59] <Zsolt--> any idea how can I enable and disable the relays in a safe and controlled way? I've been looking for the SYS_RESET and SYS
  • [17:04:30] * Vasco_O is now known as Vasco
  • [17:04:51] <Zsolt--> PWR pins, but it's not that I'm looking for
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  • [17:17:20] <agmlego> sure, use a really controller that uses inverted logic.
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  • [17:23:22] <Zsolt--> what do you mean by that? I would like to know if there is an logic signal that I can use to determine if the BBB is ready to be used.
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  • [17:25:48] <zmatt> Zsolt--: the pins have default internal pull-up/down that varies per pin. you can override it with an external pull resistor to your desired default value
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  • [17:29:22] <Zsolt--> Right, I have set the pin up for pulldown, which would keep the signal low. But it seems, during the bootup the device tree is not read immediatelly, but a bit after...
  • [17:29:25] <agmlego> Zsolt--: yes; whichever pun your application changes the state of.
  • [17:29:55] <Zsolt--> I can try to use an external pulldown
  • [17:30:06] <agmlego> no need.
  • [17:30:06] <Zsolt--> any recommendation for the value?
  • [17:30:44] <agmlego> just use a relay controller which is off when input if high, then drop the pin low in your application.
  • [17:31:45] <zmatt> agmlego: except then it'll view a powered down BBB as "on"
  • [17:32:20] <agmlego> eh.
  • [17:32:23] <agmlego> acceptable.
  • [17:32:54] <Zsolt--> a workaround might be if I drive the logic with the BBB-s 5V output, and if the BBB is powered down, then the logic is not working :P
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  • [17:33:30] <Zsolt--> but I dont like this way...
  • [17:33:35] <Zsolt--> seems hacking
  • [17:33:36] <zmatt> Zsolt--: if possible, an additional "enable" signal that defaults to low would also use
  • [17:33:45] <agmlego> yeah, given the lack of info in the request, i assumed that lack of power was not a concern.
  • [17:33:48] <zmatt> a pulldown seems like the simplest solution though
  • [17:34:26] <Zsolt--> ok, so any recommendation for the pulldown value?
  • [17:34:55] <zmatt> Zsolt--: if you want an overview of the default state of the pins on the expansion header: see the P9 and P9 tabs of my spreadsheet: https://docs.google.com/spreadsheets/d/1CK5c-Cs8G1RtzGo-J3VJsD9m5K-fp06AncgeYWsdjSU/view
  • [17:35:10] <zmatt> (the H or L near the center)
  • [17:35:20] <zmatt> hmm, lemme check
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  • [17:37:49] <zmatt> it seems 10K may suffice to override the internal pull
  • [17:38:22] <zmatt> using a lower value like 4.7K or 1K shouldn't be a problem either
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  • [17:39:08] <stt_michael> <= also veremit: zmatt
  • [17:39:32] <stt_michael> right .. off the clock .. bbl .. a-la veremit :p
  • [17:39:33] <Zsolt--> ok this will be a lame question. I understand the pullup and pulldown for inputs, but does this work for outputs as well?
  • [17:39:47] <zmatt> stt_michael: that's confusing!
  • [17:39:52] <stt_michael> I think you mean open-collector ...
  • [17:39:59] <zmatt> Zsolt--: while in reset, none of the pins are outputs
  • [17:40:05] <stt_michael> zmatt, its simple .. thisis my work nick .. veremit is my alter-ego :p
  • [17:40:20] <stt_michael> right .. going, gone.
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  • [17:40:45] <Zsolt--> right, but after the reset I need to use it for outputs
  • [17:40:54] <zmatt> Zsolt--: once you get to the point of configuring a pin as output, the pull becomes irrelevant (well, it'll consume a bit of power if you drive opposite to the pull)
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  • [17:41:14] <Zsolt--> right, OK
  • [17:41:52] <Zsolt--> thanks for the google docs, this is very useful. Now I try to move the relay controller pin to a "free" one.
  • [17:42:40] <zmatt> if you use a pin with an "L", those should remain low until they are configured by device-tree
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  • [17:45:22] <zmatt> (the pins labeled ZL or ZH are floating during reset but have internal pull-down / pull-up enabled respectively immediately when reset is released)
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  • [18:19:53] <Zsolt--> the pulldown resistor works
  • [18:21:02] <Zsolt--> but now I see another "issue". Once I insert the 5V power, there is a very-very low period of time, when the motors starting to run
  • [18:21:20] <Zsolt--> and then they are off. Can this be something aroun the SYS_RESET line?
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  • [18:30:16] <Zsolt--> nvm
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  • [18:38:25] <zmatt> random tip: always make very sure that the BBB and whatever you connect to it have a good ground connection
  • [18:38:46] <zmatt> to each other
  • [18:38:56] <zmatt> (not necessarily to actual ground)
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  • [18:45:20] <Zsolt--> thanks for the answers, the thing seems working
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  • [20:00:34] <zmatt> heh, funny, it appears emif is actually perfectly capable of supporting 4 GB on a single rank... there's just the minor problem that although JEDEC defined memories with the required geometry, nobody makes them
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  • [20:01:27] <zmatt> otherwise the am572x could in principe support the full 8 GB even though the second rank is defeatured
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  • [20:02:46] <zmatt> (a dm814x could too, that's where I did my little test, but it would be a bit inconvenient to have to constantly change your DMM mappings to be able to access all of it through the 2 GB address space window you have available)
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  • [20:20:49] <zmatt> nm that, a few manufacturers do make them (1Gx8 single-rank)... just a bit expensive
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  • [21:33:40] <dhirc> Has anyone tried the new TI SDK 2.00.00 image on the BBB? I am having some issues with a usb soundcard reliability. I am using speaker-test to test and can not hear any audio. Any ideas?
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  • [22:13:00] <dhirc> Has anyone tried the new TI SDK 2.00.00 image on the BBB? I am having some issues with a usb soundcard reliability. I am using speaker-test to test and can not hear any audio. Any ideas?
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  • [22:15:32] <BeagleJohn> Hello all. I'm trying to get to Debian on my brandnew BBB. With my BBB connected to my router, I try to connect to the BBB. After hitting enter, Debian asks for a pw and tells me the pw but when I try to type it in, nothing shows on my PC screen when I type.
  • [22:16:51] <BeagleJohn> That is, I'm successful up the the point of typing in the pw but it doesn't show on PC's screen and eventually I get a timeout from putty.
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  • [22:17:26] <BeagleJohn> So is there a trick to entering the pw to get Debian running?
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  • [22:26:55] <rcn-ee> BeagleJohn, make sure you ares using the correct user name too...
  • [22:27:00] <BeagleJohn> Actually, instead of timeout of putty on my BBB, I eventually get "Connection closed by remote host"
  • [22:29:33] <BeagleJohn> So cannot enter the pw to get going with Debian. I found an entry in Google groups that someone had a similar problem that was fixed after he flashed the new Debian to his eMMC. Maybe that'll work.
  • [22:30:58] <BeagleJohn> Oh, rcn-ee: I missed your message. What is the correct user name? I was using debian:local as the user name. I think that showed up when I first tried it.
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  • [22:31:30] <rcn-ee> BeagleJohn, user=debian
  • [22:31:47] <rcn-ee> debian@ip or debian@hostname.local
  • [22:32:56] <BeagleJohn> Oh, my, three possible user names?
  • [22:33:25] <rcn-ee> BeagleJohn, three? there's only one...
  • [22:35:05] <BeagleJohn> I get confused easily, as I'm a newbie at bbb and Linux. But rcn-ee, you said debian, debian@ip or debian@hostname.local. Sorry, I'm confused.
  • [22:35:31] <rcn-ee> BeagleJohn, @ = at... debian at <ip address>... (or hostname..)...
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  • [22:39:04] <BeagleJohn> rcn-ee, Sorry, no comprendo.
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  • [22:45:24] <BeagleJohn> Ah, I think it's running now. I should have typed in "root" as the user. That was told to me in the book "Getting Started with BeagleBone" by Matt Richardson.
  • [22:45:47] <BeagleJohn> So hopefully ok now, at least until I run into Linux problems.
  • [22:46:08] <BeagleJohn> Thanks, rcn-ee, for attempting to help me. Bye for now.
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  • [22:58:15] <ds2> rcn-ee: have you considered quilt?
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