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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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  • [00:05:53] <ds2> use the barrel connector for power
  • [00:06:40] <navaati> yeah… atm i don't have ideas anymore
  • [00:07:08] <navaati> i'll try the barrel connector at home, i'm at school and i don't have my alim right now
  • [00:07:32] <navaati> i don't have much hope it'll do any difference tho
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  • [01:01:56] <navaati> holy f*ck guys that was that !!!
  • [01:02:04] <navaati> now I can sleep in peace
  • [01:02:11] <navaati> thank all :)
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  • [02:25:50] <zmatt> navaati: once usb-boot gets enumerated by an rndis driver, it's indeed all over -- you'll be in usb-boot, it will no longer try other modes
  • [02:26:40] <zmatt> why on earth would you want uart boot mode instead of, say, usb-boot or ethernet boot?
  • [02:35:32] <myself> perhaps the PC you have ready access to is work-managed and you don't have access to install rndis drivers, but you have a uart you can use?
  • [02:37:11] <zmatt> well an uart on a PC itself is of no use since you need 3.3V TTL signalling rather than RS232 levels
  • [02:39:09] <zmatt> the ftdi cables typically *do* need an actual third party driver to be installed, rndis is built into windows (in fact invented by microsoft), and only needs "installation" in the same sense that a mouse needs installation.... then again, if you don't have admin rights you're not going to get usb boot to work anyway most likely
  • [02:40:22] <zmatt> doesn't uart boot take ages?
  • [02:41:44] * zmatt uses Ethernet boot when doing baremetal tests, and plans to use it for flashing BBBs
  • [02:42:36] * alexanderhiam_ is now known as alexanderhiam
  • [02:47:24] <zmatt> myself: actually, the rndis driver *is* installed on working on your host PC
  • [02:47:31] <zmatt> myself: it was preventing uart boot from working :)
  • [02:47:58] <zmatt> *install and working
  • [02:48:52] <zmatt> but as non-admin you're presumably not going to be allowed to run a BOOTP server
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  • [02:50:26] <zmatt> though, on linux, "BBBlfs" just uses libusb to perform the remaining exchange
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  • [02:51:47] <zmatt> which itself doesn't require special privilege since the user logged into a physical seat is normally allowed to access associated usb peripherals
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  • [02:52:34] <zmatt> possibly the same is true on Windows (I have no idea really)
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  • [03:26:02] <myself> hah, never underestimate the ability of a misguided Windows admin to make things difficult on their users.
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  • [03:26:40] <zmatt> uhuh
  • [03:27:56] <zmatt> I wouldn't feel any urgent desire to use a Windows system as host for BBB development in the first place anyway
  • [03:28:56] <myself> concur.
  • [03:29:02] <myself> but sometimes that's what's around
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  • [03:48:46] <zmatt> mostly windows PC around at work too, for linuxy things they either ssh to the designated "development" beaglebone, or to bob
  • [03:49:00] <zmatt> (bob, the builder, where a cross-compile environment is available)
  • [03:51:21] <zmatt> did you know you can actually enable focus-follows-mouse in Windows via regedit?
  • [03:52:11] <zmatt> (though some applications really don't interact well with it, including current versions of Visual Studio)
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  • [04:14:43] <Jd134> What are some good capes to use for bi directional motor control
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  • [06:48:45] <sachin> hjgh
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  • [06:52:09] <sachin> I just bought a BBB for learning Embedded linux and linux device drivers. I want to write a driver for UART in BBB, but as in x86 architecture the hardware used is PC16550d and its corresponding registers can be found in /proc/ioports, can anyone help me get started with information on hardware present for UART on BBB and how to check its corresponding address.
  • [06:52:43] <LetoThe2nd> sachin: sure, go read the am3XXX TRM. or the already existing uart drivers.
  • [06:53:27] <zmatt> sachin: of all possible choices of peripheral to practice on... I would not recommend the UART
  • [06:53:32] <zmatt> it is terrible
  • [06:53:54] <zmatt> the whole Ethernet switch subsystem is probably easier to configure correctly than an UART
  • [06:54:44] <LetoThe2nd> zmatt: hey, don't confuse reality with learning :)
  • [06:55:49] <zmatt> note that you can also practice using uio: that lets you map a peripheral into userspace and receive IRQs by reading from an fd
  • [06:56:22] <zmatt> then at least you know how the peripheral behaves before trying again in kernel space
  • [06:57:25] <zmatt> LetoThe2nd: the existing uart driver contains bugs
  • [06:57:30] <zmatt> the initialization procedure in the TRM also
  • [06:58:10] <zmatt> I don't blame them, the uart really is just horrible
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  • [06:59:33] <zmatt> especially since its register map morphs, with some registers whether other registers are visible or readonly
  • [06:59:35] <sachin> I have a sensor for testing which interfaces via UART i.e BNO05, So I just want to interface by writing a out of kernel tree driver module
  • [07:00:16] <zmatt> sachin: to get an impression, see this post (and probably the whole thread): http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/379360/1342615#1342615
  • [07:00:41] <sachin> A simple RX and TX communication just to get me started on BBB
  • [07:00:42] <LetoThe2nd> sachin: better write something userspace then. if its some serial protocol on top of an uart, putting it into the kernel is mostly pointless.
  • [07:01:14] <zmatt> although I later realized things can be simplified, especially if you don't give a shit about manual control of modem control signals (which is almost always true)
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  • [07:01:28] <zmatt> LetoThe2nd: well, the TTY layer does have a _lot_ of overhead iirc
  • [07:02:08] <LetoThe2nd> zmatt: which certainly will kick your ass with an orientation sensro... NOT
  • [07:02:29] <zmatt> LetoThe2nd: well, maybe he wants to poll it really fast? O:)
  • [07:03:21] <zmatt> or just wants to practice directly working with a peripheral
  • [07:03:33] <LetoThe2nd> long story short: reading uart peripheral docs can be interesting to learn, but is totally the wrong way here (IMHO)
  • [07:03:34] <zmatt> but the uart... aiai
  • [07:04:05] <zmatt> the TRM chapter of the UART is confusing and contains some very bad advice
  • [07:04:21] <LetoThe2nd> zmatt: sounds like real life, huh?
  • [07:04:26] <zmatt> I'm looking for my latest version of the simplified UART init procedure
  • [07:04:31] <zmatt> after init the UART is okay
  • [07:05:11] <zmatt> at least, as long as you don't do more than 8 consecutive posted writes, since that corrupts the FIFO pointer logic
  • [07:05:46] <zmatt> (inserting dummy writes fixes the problem, as does using DMA)
  • [07:06:00] <zmatt> luckily most UART code is slow enough to never notice this
  • [07:06:40] <zmatt> oh, and don't look at TI's StarterWare for guidance either, trust me.... http://e2e.ti.com/support/embedded/starterware/f/790/p/386753/1368322#1368322
  • [07:07:53] <sachin> I just wanted to write a serial driver to learn interfacing a peripheral and interrupt handling and later DMA
  • [07:08:01] <sachin> on BBB
  • [07:08:25] <LetoThe2nd> well, enough said then.
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  • [07:09:04] <sachin> So if anyone can point me to right direction for documents and datasheets to read, ill appreciate
  • [07:09:23] <LetoThe2nd> 0what is unclear about TRM?
  • [07:09:52] <zmatt> LetoThe2nd: the registers they forgot to list, for example
  • [07:09:58] <LetoThe2nd> and that a datasheet contains superfluous and sometimes misleading or wrong information is real life. better learn that too.
  • [07:10:28] <LetoThe2nd> e.g. reading a squeaky clean, stripped implementation is no learning effect.
  • [07:10:32] <zmatt> sachin: I found one version of my init procedure -> http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/351658/1237650#1237650
  • [07:10:43] <LetoThe2nd> (my $.02)
  • [07:10:56] <zmatt> LetoThe2nd: learning through the UART is cruel though
  • [07:11:18] <sachin> So what do you suggest me to start with?
  • [07:12:23] * LetoThe2nd would say adc in the iio.
  • [07:13:29] <zmatt> the adc might be a nice one... it doesn't require too much setup, and seems quite well-behaved
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  • [07:14:08] <LetoThe2nd> yeah. size is bearable, and the specific implementation is not a humonguous mess.
  • [07:14:27] <zmatt> dunno about the current driver, but then again I don't really understand IIO either
  • [07:14:51] * zmatt disabled IIO and programs the ADC from userspace, including EDMA to a circular buffer to always have the latest values available
  • [07:16:05] <zmatt> sachin: if you're really new to the am335x altogether, I suggest just browsing around and playing with things
  • [07:16:14] <zmatt> most of which can be done from userspace
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  • [07:17:18] <zmatt> I personally use GPIO, ADC w/DMA, and PWM from userspace
  • [07:18:04] <zmatt> for McSPI I'm conflicted between attempting to fix the driver or just tossing it and using it from userspace
  • [07:18:09] * kiwichris (~kiwichris@msc1401703.lnk.telstra.net) Quit ()
  • [07:18:20] <sachin> I am familiar with application level for most of the drivers in linux
  • [07:18:49] <sachin> I mean access the the drivers using C libraries.
  • [07:19:00] <zmatt> that makes you familiar with linux
  • [07:19:09] <zmatt> accessing the peripherals makes you familiar with the hardware
  • [07:19:17] <sachin> open(), read(), write(), ioctl() calls etc.
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  • [07:21:04] <zmatt> if you want a useful project: the current omap2-mcspi driver implements its own transfer_one_message method rather than using the standard one provided by spi.c
  • [07:21:16] <zmatt> thanks to which it doesn't support using GPIOs as chip-selects
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  • [07:22:30] <zmatt> it also does its own dma mapping even though afaict spi.c already offers to do that
  • [07:23:29] <zmatt> afaik fixing the driver mostly means tossing away a lot of code in omap2-mcspi.c that (poorly) duplicates the work done by spi.c
  • [07:23:37] <zmatt> but I may be wrong
  • [07:25:28] <zmatt> if you want to stick to your UART project: the last link I gave contains a functional init procedure.... after init, the UART is not *too* eccentric anymore
  • [07:26:07] <zmatt> apart from not being able to cope with too many consecutive writes to the FIFO (even if it has enough space)
  • [07:26:09] <sachin> Yes thanks I think ill stick to the UART.
  • [07:26:19] <zmatt> try it out from userspace from
  • [07:26:22] <zmatt> *first
  • [07:26:40] <sachin> Yes
  • [07:26:45] * zmatt looks for the necessary device tree ingredient
  • [07:26:58] <sachin> I need the hardware information
  • [07:27:16] <zmatt> register map is mostly in the TRM
  • [07:27:34] <sachin> Whats a TRM?
  • [07:27:36] <zmatt> grab an omap4/5 TRM for the full register map
  • [07:27:43] <zmatt> Technical Reference Manual
  • [07:27:47] <sachin> Ok
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  • [07:28:04] <LetoThe2nd> zmatt: see why i backed out? :-)
  • [07:28:19] <sachin> Thanks a lot
  • [07:28:33] <zmatt> sachin: learn to download TRMs of related processors and cross-reference in case of confusion
  • [07:28:44] <zmatt> and don't assume the TRM is always right
  • [07:29:35] <zmatt> for the AM335x, I also recommend downloading the omap-L137 and/or omap-L138 TRMs, especially if you ever want to do anything with the LCDC
  • [07:30:17] <zmatt> the DM814x TRM is its closest relative, and has good info on the interconnects
  • [07:31:17] <zmatt> (the DM816x is a more distant ancestor, but one of the few that has a substantial chapter on the Debug subsystem)
  • [07:32:08] <sachin> I am new to device driver programming so pardon me if I ask anything stupid or my technical terminology is not upto the level
  • [07:32:24] <zmatt> but often the most detailed info can be found in OMAP (before omapgeddon) or Vayu documentation... you just have to filter out the info that's not relevant to you
  • [07:33:04] <zmatt> in case of the UART, the AM335x TRM register map is missing several registers
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  • [07:33:32] <zmatt> the TRMs of its siblings do mention them
  • [07:33:49] <zmatt> (the missing registers allow you to determine how much data is currently in the FIFOs)
  • [07:34:16] <zmatt> ignore the UART initialization procedure stated in the TRM, it's garbage
  • [07:34:48] <zmatt> and, general rule when working with any hardware: _check for applicable errata_
  • [07:35:24] <sachin> ok, thanks for the info
  • [07:35:39] <sachin> Ill note all of the above points
  • [07:36:09] <zmatt> for background info: the first thread I linked to (with the state-diagram) was the one where I was still figuring out the UART myself in parallel to helping someone
  • [07:36:42] <zmatt> so that affects especially earlier posts in that thread
  • [07:40:19] <zmatt> sachin: btw, if you want to use uio (which is a bit nicer than using /dev/mem, and also allows you to use irqs from userspace):
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  • [07:41:08] <zmatt> make sure CONFIG_UIO_PDRV_GENIRQ is included in the kernel (it is compiled as module in any not-too-ancient kernel from rcn-ee's repo)
  • [07:41:35] <zmatt> echo 'options uio_pdrv_genirq of_id=uio' >/etc/modprobe.d/uio.conf
  • [07:43:03] <zmatt> that lets you attach uio_pdrv_genirq to a peripheral by using compatible = "uio"; in device tree
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  • [07:43:31] <zmatt> make sure its register range starts and ends on a page boundary
  • [07:43:53] <zmatt> (since uio can't mmap() a portion of a page, obviously)
  • [07:45:12] <zmatt> by default uio devices are just numbered (/dev/uio0 etc) which is annoying, however recent 4.x kernels make it easy to have an udev rule create an alias based on a device-tree property
  • [07:46:03] <zmatt> for example you could put add uio-alias = "foo"; in the device tree node
  • [07:47:26] <zmatt> and e.g. add the udev rule:
  • [07:47:42] <zmatt> SUBSYSTEM=="uio", SYMLINK+="uio/%s{device/of_node/uio-alias}"
  • [07:47:51] <zmatt> now you got /dev/uio/foo
  • [07:47:53] <zmatt> ta-da
  • [07:47:56] <zmatt> :)
  • [07:50:00] <zmatt> sachin: also, I don't know how familiar you are with ARM Architecture, but it's useful to know that devices are normally mapped as Device-type memory in kernelspace, but annoyingly they are mapped "Strongly-ordered" when using /dev/mem or uio
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  • [07:52:18] <zmatt> this little difference makes writes to a device take 1 cycle in kernelspace (until you perform enough writes to fill up some fifo on route to the peripheral)
  • [07:52:34] <zmatt> versus about 150 cycles in userspace (the ping time to the peripheral)
  • [07:53:27] <zmatt> I'll now stop overflowing you with info :P
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  • [08:12:00] <sachin> zmatt: Thanks for all the info I really appreciate it
  • [08:12:50] <sachin> And I am new to ARM processor, worked with ARM controller but not with Processor.
  • [08:25:22] <zmatt> sachin: a cortex-A processor is quite a different beast from a cortex-M (or older ARM7/ARM9 processors)
  • [08:25:26] <zmatt> :)
  • [08:28:35] * KotH finds it kinda cool, that there are arm9 uC's, with on-die ram and flash
  • [08:30:23] <KotH> ...now if nxp would learn something from st and give those beast some reasonable amount of ram, one could actually make use of that raw processing power
  • [08:31:10] <zmatt> there are two ARM9 cores in HDVICP2 aka IVA-HD
  • [08:31:38] <zmatt> instantiated in omap4/5, dm816x (3 instances), dm814x, am572x
  • [08:32:03] <KotH> does not surprise me
  • [08:32:07] <KotH> arm is everywhere
  • [08:32:26] <KotH> and it will become STANDARDS, ORDER, DECORUM in servers
  • [08:32:42] <zmatt> I guess they're either cheaper than or perform better than cortex-m for streaming data
  • [08:32:52] <zmatt> while avoid the timing uncertainty of the cortex-A
  • [08:32:56] <KotH> more memory bw
  • [08:33:16] <KotH> and they are cheap, if you already have licenses for the more advanced arm cores
  • [08:33:29] <zmatt> that will play a role no doubt :P
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  • [08:34:34] <zmatt> in iva-hd they're just used as "sequencers" though
  • [08:34:39] <zmatt> to manage the other components
  • [08:35:32] <zmatt> each core has 16 KB data TCM (space reserved for 32 KB)
  • [08:35:37] <zmatt> 32 KB instruction TCM
  • [08:36:20] <zmatt> and a connection to the SL2 RAM
  • [08:39:58] <KotH> i can top that!
  • [08:40:05] <KotH> the rpi has an arm9 core as usb controller!
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  • [08:43:18] <zmatt> SL2 is a beast... 256 KB (though it can be instantiated up to 512 KB in theory) interleaved over 8 memory banks, serves 18 initiators, everything 128-bit wide
  • [08:43:39] <zmatt> so that arbiter is an an 18-to-8 crossbar, 128-bit wide
  • [08:47:13] <zmatt> I think that might actually imply more data hauling capacity than the L3
  • [08:47:57] <KotH> sl2? l3?
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  • [08:48:38] <zmatt> SL2 is the shared L2 SRAM of IVA-HD (HDVICP2) components
  • [08:49:16] <zmatt> L3 ... have you never even *browsed* any docs on any TI SoC ? :P
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  • [08:50:11] <KotH> zmatt: only that of the am335x... and only superficially... to answer questions here ;)
  • [08:50:45] <zmatt> the am335x has an L3 interconnect too, it's the main interconnect between components
  • [08:51:19] <KotH> zmatt: do you know that i dont own any beagle*?
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  • [08:51:31] <zmatt> lol
  • [08:52:25] <zmatt> then get one you silly! they're fun
  • [08:52:59] <zmatt> or get the "toy car" shown on pages 14-15 of http://focus.ti.com/asia/download/2BJ_1-2.pdf
  • [08:53:03] <KotH> sorry, cannot afford them
  • [08:53:10] * KotH is a poor student
  • [08:53:18] <zmatt> (if you'd manage to get one of those, that would make you an epic god)
  • [08:54:19] <KotH> av500: get one of the toy cars shown on pages 14/15: http://focus.ti.com/asia/download/2BJ_1-2.pdf
  • [08:54:26] <KotH> av500: they are missing in your collection!
  • [08:55:27] <zmatt> see if they can swap out the DRA626 for a DRA628 while you're at it... dunno what features are missing in the 626 since not even a tech brief is available, but I'm sure you wouldn't want to miss out
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  • [08:56:18] <zmatt> actually, I might know... the slides show little or no sign of pruss or the pwmss instances, even though they know they're on that die
  • [08:57:13] <zmatt> (the DRA62x / DM811x is sort of a hybrid between the DM814x and the AM335x)
  • [08:57:48] <zmatt> never made became available for broadmarket though, only the automotive boys get to play with them
  • [08:58:08] <KotH> well.. just buy a couple million and you'll get them
  • [08:58:34] <KotH> but: how many people does TI currently have working on their SoC families?
  • [08:58:52] <KotH> they have been firing them for 3years straight
  • [08:59:24] <zmatt> avnet claims you can buy a DRA622 with minimum order quantity 1
  • [08:59:36] <nyo_> oh my god arduino is writed in java
  • [08:59:45] <zmatt> but that's a DRA622... who knows what might be missing
  • [09:02:41] <zmatt> KotH: I actually considered buying an evm811x to play with... but they're a bit expensive as a toy just to play with
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  • [09:08:09] <zmatt> it's a tragedy how TI has treated the 81xx series
  • [09:08:27] <zmatt> oh well, once the x15 comes out I'll probably forgive them instantly
  • [09:08:50] <zmatt> nyo_: ?
  • [09:10:03] <tbr> if it comes out. what's the current estimate for when they want to announce it?
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  • [09:20:36] <zmatt> "So I'm guessing that means that the Digi-Key listing with an estimated ship date of 11/2/2015 is not exactly solid yet?"
  • [09:20:40] <zmatt> Gerald> "It is as good as any. If TI supplies the parts, then that date can be met. I can't speak for TI."
  • [09:21:19] <zmatt> so they moved it again, to november
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  • [09:25:03] <zmatt> ok, afk for a bit
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  • [11:13:23] <nyo_> zmatt, I mean the IDE of arduino wants java :*
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  • [12:49:42] <Parduz> How can i know what's wrong witn a init.d/script? I tried to make X11vnc start but it don't work, and i don't know why
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  • [14:53:59] <owl-v-_> what's difference between bbw and bbb ?
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  • [15:04:34] <agmlego> One is white, and one is black. They also use different SoCs, and they have differences in pins.
  • [15:05:00] <agmlego> owl-v-_: But I expect that typing "beaglebone white vs black" into Google will be far more instructive.
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  • [15:10:22] <Boned> I have a question, I'm trying to run a cpp program. But when I try to run it it says: "-bash: ./CVA: No such file or directory". I've copied the program from an other Beaglebone on which it did work
  • [15:10:30] <Boned> what am I doing wrong?
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  • [15:11:50] * agmlego gets out the crystal ball.
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  • [15:12:49] <agmlego> My guess is either a) something is wrong with $PATH on the afflicated bone or b) you failed to copy the permissions correctly or c) you fail to have the correct dynamic libraries installed.
  • [15:12:55] <agmlego> In order of likelihood.
  • [15:13:03] <agmlego> But this is a Linux thing, not a bone thing.
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  • [16:50:04] <Guest31571> hi how to use beagle_boneblack as web server
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  • [16:50:24] <Guest31571> what webserver to use
  • [16:50:29] <tbr> it has one preinstalled in the defaulte images
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  • [17:07:18] <owl-v-_> have you tried make your own os on bbb?
  • [17:10:16] <thurgood> ... why?
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  • [17:12:32] <owl-v-_> for fun.
  • [17:12:49] <owl-v-_> anyway, how do i stop at u-boot prompt?
  • [17:12:58] <owl-v-_> rather than booting an os?
  • [17:13:16] <agmlego> Fail to have an OS installed.
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  • [17:18:28] <myself> haven't done it, but I'm pretty sure you just send characters into the uart console during boot, if it sees one at the "hit any key to stop autoboot" step, it stops there and gives you a prompt
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  • [17:28:28] <veremit> just hit enter at the uboot prompt .. but you'll need to have a console connected at boot cf. serial
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  • [17:29:55] <natsukao_> hi
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  • [17:31:43] <owl-v-_> myself, veremit, minicom didn't send a character. I'm using 'screen' right now.
  • [17:31:50] <natsukao_> i got 42 led panel (on each panel are soldered 24 led's), each panel is 12 Volt and 2.4 watt
  • [17:32:17] <myself> owl-v-_: what serial adapter are you using, just curious?
  • [17:32:50] <natsukao_> which is the value in Ohm of the resistor to use for each led ?
  • [17:33:06] <owl-v-_> myself, one from sparkfun.com ftdi with 3V
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  • [17:33:53] <owl-v-_> natsukao_, one that does not burn led and the processor.
  • [17:34:04] <myself> you're seeing bootup messages, so that's good. Can't hurt to try a loopback test: remove the adapter from the bbb, wire tx to rx and send some characters in minicom/screen, see if they echo back
  • [17:34:50] <veremit> minicom has flow control on by default iirc
  • [17:34:53] <veremit> turn it off :D
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  • [17:39:05] <owl-v-_> veremit: what's the command line option for turning flow-control off?
  • [17:39:45] <veremit> I go into the options .. Ctrl-A-O
  • [17:39:50] <veremit> serial port setup
  • [17:41:13] <owl-v-_> veremit: no option like 'minicom -D /dev/tty.usb -b 115200' ?
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  • [17:41:23] <owl-v-_> btw, it's working
  • [17:41:54] <veremit> I don't think there's an option for it .. that I know of ..
  • [17:43:03] <veremit> once you've set it . I just save as default
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  • [17:56:25] <owl-v-_> what are the requirement for u-boot to boot a software? (ex:kernel)
  • [17:57:33] <myself> you're asking questions that're answered in the u-boot docs, why?
  • [17:57:49] <veremit> myself : most people can't be bothered to read docs
  • [17:58:00] <veremit> myself : or search the web
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  • [18:06:05] <mistawright> hi guys I have the latest debian image flashed to a microsd card and needed to see if gcc 4.9.2 is causing my segmentation fault woes. How can I go about downgrading to 4.8?
  • [18:08:03] <thurgood> have you tried apt-get ?
  • [18:09:10] <thurgood> should be able to remove the current version and install the specific one you want
  • [18:09:21] <mistawright> installing g++-4.8 that way was not sure if it would remove the existing g++/gcc at that point. Im used to using gentoo/archlinux and not too much of a fan debian based distros
  • [18:10:08] <veremit> build gentoo for it
  • [18:10:10] <thurgood> ah, dunno a whole lot about gentoo
  • [18:10:18] <veremit> shouldn't take more than a couple of days to compile ;)
  • [18:10:24] <thurgood> :/
  • [18:10:28] <zmatt> can gentoo cross-compile?
  • [18:10:37] <veremit> ofc
  • [18:10:46] <veremit> cross-tool-ng
  • [18:10:53] <veremit> builds its own tool-chain :D
  • [18:11:14] <veremit> just .. takes a while
  • [18:11:30] <zmatt> *can gentoo cross-compile from a working random linux system with a cross-compiler installed
  • [18:11:32] <mistawright> it can
  • [18:11:33] <zmatt> :P
  • [18:11:56] <veremit> zmatt : boot stick :P
  • [18:11:57] <mistawright> just never tried to get it working on the beaglebone black
  • [18:12:15] <veremit> I've seen guides for arm boards .. not sure whether it was the wandboard/pi/beagle ..
  • [18:12:18] <zmatt> and I think gentoo nowadays even have some prebuilt binaries for the lazy fucks
  • [18:12:19] <mistawright> tried archlinux but failed with my distcc cross compile attempts and gave up
  • [18:12:34] <zmatt> mistawright: maybe yocto is something for you?
  • [18:12:38] <veremit> ah yea you don't wanna cross-compile with distcc .. unless you're very careful how you set it up
  • [18:12:50] <veremit> its possible .. but SO many gotchas
  • [18:13:11] <mistawright> veremit, this was with setting it to use a compiler to build arm binaries. cant remember if it was using the linaro toolchain or something
  • [18:13:13] <veremit> and yea .. fyi .. I haven't tried :D
  • [18:13:28] <veremit> I was lazy .. have always used debian/linaro/RN's images :D
  • [18:13:39] <veremit> one day I'll do it "the gentoo way"
  • [18:14:00] <veremit> but yea .. sucks compiling all the stuff on anything shy of a imx6-quad imho.
  • [18:14:22] <veremit> certainly wouldn't on a single-core 800mhz/1ghz .. too f** slow
  • [18:14:31] * zmatt cross-compiles mostly everything
  • [18:14:35] <veremit> hence pre-built distro's win for me.
  • [18:15:00] <zmatt> even for tiny projects cross-compiling and rsync'ing it over is faster than compiling locally
  • [18:15:11] <veremit> zmatt : well that's a no-brainer
  • [18:15:17] <mistawright> lol
  • [18:15:20] <zmatt> (I should probably get off my lazy ass and setup NFS to remove the rsync step)
  • [18:15:28] <veremit> zmatt : yup
  • [18:15:41] <veremit> stick to nfs3 .. :p
  • [18:15:49] <veremit> its piss-easy
  • [18:16:12] <veremit> you can even nfs-boot ...
  • [18:16:24] <veremit> ahem .. bootp
  • [18:16:36] <veremit> best way for development
  • [18:17:39] <zmatt> yeah bootp/tftp is something I already use for baremetal dev
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  • [18:31:11] <mistawright> what device do I need to mount from my beaglebone black to edit the uEnv.txt of the boot partition of the emmc?
  • [18:31:37] <mistawright> I dont have my serial cable to figure out why this dtb is causing it not to boot from the emmc
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  • [18:34:29] <veremit> get one.
  • [18:34:34] <veremit> :P
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  • [18:39:41] <limbrik> Running the beagleboard 4.1 kernel, should I have something at /sys/bus/i2c/devices/0-0024/input? In search of the mythical tps65217_pwr_but...
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  • [18:43:14] <zmatt> veremit: one thing about nfs is that I worry a bit about security... I know we have at least a few managed switches, maybe I should see if I can isolate things a bit
  • [18:43:16] <linitrofe> Hi
  • [18:44:15] <zmatt> veremit: of course preferably each beagle would authenticate to kerberos, but well...
  • [18:44:18] <zmatt> :P
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  • [18:44:35] <agmlego> NFS and security probably ought not be in the same sentence... ;-P
  • [18:44:52] <zmatt> agmlego: that's not quite true with nfs4 anymore afaik?
  • [18:45:30] <zmatt> agmlego: but that's why plan B would be an isolation wall from the rest of the company network
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  • [18:46:35] <veremit> just run it on a separate network & switch .. peasy. Dual lan boards are easy enough to come by
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  • [18:47:08] <veremit> zmatt .. is the tps on the i2c?
  • [18:47:10] <zmatt> veremit: yeah, but still it's suboptimal
  • [18:47:16] <zmatt> veremit: of course it is
  • [18:47:20] <veremit> compromises :p
  • [18:47:21] <zmatt> veremit: i2c 0
  • [18:47:23] <agmlego> zmatt: NFSv4 is better, but only if you configure it to refuse to talk anything lower.
  • [18:47:56] <zmatt> agmlego: I see no problem with that
  • [18:48:10] <agmlego> Just not often configured out of the box that way.
  • [18:48:14] <veremit> I should crack nfs4 some day ..
  • [18:48:24] <veremit> just probably not this year.
  • [18:48:37] <veremit> too much other crap lol
  • [18:49:25] <zmatt> agmlego: I rarely blindly trust out-of-the-box config
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  • [18:53:11] <zmatt> can't I use just smb as rootfs? ;-)
  • [18:53:45] <limbrik> I should add that the tps65217 is there at i2c/devices/0-0024, everything works including soft poweroff, just no trace of an input subsystem. Not sure if something is missing from the driver or just my config
  • [18:54:18] <zmatt> limbrik: what do you mean by soft poweroff and by input subsystem
  • [18:54:31] <zmatt> poweroff requires cooperation of the RTC
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  • [18:55:44] <zmatt> (there's also seqdown but the docs make it clear it's for debugging purposes and I never dared to use it)
  • [18:56:11] <limbrik> zmatt: I'm seeing references online to there being an input/input0 node in sysfs for tps65217_pwr_but... I probably don't have the terminology exactly correct there
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  • [18:56:57] <zmatt> oh, dunno, I can imagine it could produce an input device but no idea which kernels might do that, or whether this requires specific device tree config
  • [18:57:41] <limbrik> zmatt: Soft poweroff is working, which I know initiates from the rtc_omap driver, but just evidence that the tps65217 is working correctly as well I guess
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  • [18:59:14] <zmatt> ah
  • [18:59:28] <zmatt> (completely insane construction btw imho)
  • [18:59:54] <zmatt> no way to shut down other than by scheduling an rtc alarm 1 second in the future to take care of it
  • [19:02:47] <zmatt> I have no input device for the power button either
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  • [19:06:09] <zmatt> good point since i want to receive PMIC irqs too.. I'm gonna take a closer look
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  • [19:16:15] <limbrik> zmatt: Thanks for taking a look. It appears that in drivers/mfd/tps65217.c, the 3.8 branch has an interrupt handler which is entirely missing in 4.1. So maybe the functionality just never made it in
  • [19:16:27] <zmatt> iirc the irq handler was also quite buggy
  • [19:16:53] <mistawright> what device is the boot partition of the emmc on the beaglebone black?
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  • [19:17:34] <zmatt> mistawright: that's a more complicated question than you think
  • [19:17:45] <zmatt> emmc doesn't really require a boot partition
  • [19:18:13] <zmatt> or well
  • [19:18:23] <mistawright> zmatt, I was hoping to edit my uEnv.txt that is causing my board to not boot without having to flash the emmc
  • [19:19:44] <zmatt> for u-boot emmc is mmcdev 1
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  • [19:20:26] <mistawright> if booting through the microsd card how would it be represented? I do not see a /dev/mmcdev
  • [19:20:39] <limbrik> mmcblk1p1?
  • [19:20:46] <zmatt> represented where?
  • [19:21:25] <zmatt> just for clarity, boot consists of several phases
  • [19:21:40] <mistawright> i figured I could boot debian from microsd to fix the emmc boot issue
  • [19:21:48] <zmatt> MLO (aka SPL), u-boot, kernel+initrd+dt, root filesystem
  • [19:22:26] <mistawright> limbrik, that was the correct device thanks
  • [19:22:28] <zmatt> if you have a recent u-boot, you can also enter usb mass storage mode
  • [19:22:37] <zmatt> then the bbb appears like an USB stick
  • [19:22:47] <zmatt> very convenient for fixing config mistakes
  • [19:23:24] <mistawright> zmatt, how do you do that. sounds like a lifesaver
  • [19:23:35] <zmatt> you have a console cable?
  • [19:24:09] <zmatt> interrupt boot (by pressing a key when it says to) to enter the u-boot cmdline
  • [19:24:14] <zmatt> then: ums 0 mmc 1
  • [19:24:40] <zmatt> ("ums 0 mmc 0" would turn the beaglebone into an SD card reader)
  • [19:24:40] <mistawright> thanks. I'll remember that next time i have an issue like this
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  • [19:27:52] <zmatt> hmm, can you perform manual i2c transactions to a device (like the pmic) that also has a kernel driver or will the kernel object?
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  • [20:41:44] <ds2> 9
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  • [21:05:36] <veremit> you can, of course, power on with the 'boot' switch held to boot from uSD card
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  • [21:50:59] <zmatt> veremit: or connect a pulldown resistor to P8 pin 43
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  • [21:55:59] <veremit> same diff :p
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  • [21:56:14] <endoped> anyone know why lshw gives a bus error on debian wheezy?
  • [21:57:06] <veremit> doesnt exist on my debian box
  • [21:57:34] <zmatt> exists as package
  • [21:57:47] <veremit> ah so it does...
  • [21:58:22] <zmatt> endoped: probably because it probes the hardware in scary low-level ways and didn't bother to install a signal handler to catch the resulting bus errors
  • [21:58:37] <zmatt> but I've never used lshw (or heard of it before today) so that's just a guess
  • [21:59:12] <veremit> spews a bunch of crap out
  • [21:59:17] <veremit> mostly not very helpful imho
  • [22:00:27] <zmatt> no bus error here either
  • [22:00:49] <veremit> uname -a, zmatt ?
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  • [22:01:11] <zmatt> endoped: you realize wheezy is _really_ old right?
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  • [22:01:20] <veremit> 3.12-0.bpo.1-amd64 #1 SMP Debian 3.12.9-1~bpo70+1 (2014-02-07) x86_64 GNU/Linux
  • [22:01:30] <veremit> best debian vintage
  • [22:01:48] <veremit> as opposed to regular debian vintage jessie
  • [22:01:51] <zmatt> I mean, when debian themselves call it "obsolete" ...
  • [22:02:05] <veremit> only one step behind 'stable' ;)
  • [22:02:17] <zmatt> Linux bb938 4.1.2-bone12-dd1 #3 Tue Jul 21 17:45:02 CEST 2015 armv7l GNU/Linux
  • [22:02:33] <zmatt> huh, armv7l ... why the hell does it think that
  • [22:02:45] <veremit> thik that's right .. its not arm5
  • [22:02:49] <veremit> nor 9
  • [22:02:56] <zmatt> it's armv7
  • [22:03:01] <endoped> zmatt: no i didn't realize that. I just downloaded the lastest image from beagleboard.org
  • [22:03:22] * thurgood (~thurgood@67-198-113-218.static.grandenetworks.net) Quit (Remote host closed the connection)
  • [22:03:34] <veremit> Linux beagleblack 3.13.6-bone7.2 #1 SMP Fri Mar 21 03:59:54 GMT 2014 armv7l GNU/Linux
  • [22:03:36] <veremit> thats mine
  • [22:03:39] <zmatt> unfortunately I don't know who's responsible for that
  • [22:03:41] <veremit> ye olde kernel of olde
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  • [22:04:14] <endoped> didn't realize jessie was stable now.
  • [22:04:36] <veremit> jessie isn't #official# on bealg eyet afaik
  • [22:04:55] <zmatt> veremit: weird version... usually people stick at 3.8.13 or 3.14.48
  • [22:04:57] <veremit> yea lshw doesn't work on my beagle
  • [22:05:06] <veremit> zmatt : RN's old kernel build
  • [22:05:26] <veremit> he's up to 4.1 I thikn .. this was built AGES ago
  • [22:05:32] <zmatt> that's not very specific, RN is a fountain of kernels
  • [22:05:42] <veremit> precifsely :D
  • [22:05:43] <veremit> hehe
  • [22:05:58] <zmatt> https://github.com/RobertCNelson/linux-stable-rcn-ee/releases
  • [22:06:12] <veremit> Fri Mar 21 03:59:54 GMT 2014 is the clue
  • [22:06:14] <zmatt> I normally run debian stretch myself
  • [22:06:29] <veremit> unstable? or testing?
  • [22:06:36] <zmatt> stretch is testing
  • [22:06:44] <zmatt> so that's suitable for production use
  • [22:06:45] <veremit> ah just regular old debian lol
  • [22:07:03] <zmatt> my own bbb runs sid
  • [22:07:05] <veremit> no .. testing is not deemed 'production' .. thats why its called 'testing' lol
  • [22:07:11] <zmatt> it's debian
  • [22:07:25] <veremit> unstable is about the only desireable flavour of debian really
  • [22:07:28] <zmatt> "unstable" is "usually works, and not too old"
  • [22:07:32] <veremit> cos its remotely current
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  • [22:07:58] <zmatt> "testing" is "not too ancient, and stable"
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  • [22:08:14] <veremit> no .. Stable is stable. The names and conventions are quite clear
  • [22:08:32] <zmatt> "stable" is "wait wtf, this version of make is so old it doesn't even understand the syntax of my makefiles?!"
  • [22:08:47] <veremit> https://www.debian.org/releases/
  • [22:09:06] <zmatt> I'm familiar with debian's view :P
  • [22:09:17] <veremit> they're about one generation behind :)
  • [22:09:38] <zmatt> even sid often contains old crap
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  • [22:09:58] <veremit> hence better to run ubuntu/gentoo/anything else
  • [22:10:16] <veremit> jessie is like running windows 7
  • [22:10:26] <veremit> testing ... 8 and 10 .. unstable ;)
  • [22:10:56] <zmatt> I assure you none of my debian systems resemble any version of windows ;-)
  • [22:11:10] <zmatt> and indeed I've been long intending to try some other distro
  • [22:11:17] <veremit> get cracking
  • [22:11:25] <veremit> gentoo isn't hard .. just have to compile everything
  • [22:11:47] <veremit> kubuntu if you want out-the-box (I hate unity)
  • [22:12:07] <veremit> arch/mint/etc lots of flavours
  • [22:12:08] <zmatt> I'm not going to touch ubuntu
  • [22:12:13] <veremit> lol yeahno
  • [22:12:15] <zmatt> arch I once tried, didn't like
  • [22:12:45] <zmatt> I once tried fedora since quite a few innovative things that I liked seemed to be coming from that corner
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  • [22:13:33] <zmatt> the insanity of yum was one of the things that chased me away, but afaict things have improved greatly on that point, maybe I should give it one more chance
  • [22:14:05] <veremit> got a centos vps that confuses me a lil
  • [22:14:54] <zmatt> the initial "where the fuck is everything / how the hell am I supposed to do this here" phase is an annoying barrier
  • [22:15:17] <zmatt> I'm just very used to debian
  • [22:15:46] <zmatt> at the same time, I know that's just an initial phase to be overcome
  • [22:16:26] <veremit> yes ..
  • [22:16:36] <veremit> thre are better linuxes
  • [22:16:49] <veremit> I just use it for laziness and convenience on my arm boards
  • [22:18:09] <zmatt> nixos has an interesting philosophy
  • [22:18:15] <zmatt> I don't know if that translates to a usable system
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  • [22:23:16] <veremit> lol
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  • [22:25:40] <zmatt> but I like the idea
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  • [22:46:13] <GenTooMan> hmmm I thinker their is a Gentoo Arm distro. However gentoo is too deynamic for something with a solidstate drive as it tends to use the disk a lot.
  • [22:49:01] <veremit> there is, and yes on the disk too.
  • [22:53:12] <GenTooMan> You mean the LiveDVD?
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  • [23:01:36] <veremit> I mean gentoo is reliant on regular disk access for compiling/updating/etc
  • [23:01:46] <veremit> but there definitely is a gentoo arm variant
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