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  • [00:00:29] * 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'
  • [00:00:29] * Set by KotH!~attila@erica.kinali.ch on Wed Jul 15 13:55:07 UTC 2015
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  • [01:06:53] <DLPeterson> does anybody know how to determine which pins are I2C on the elinux ubuntu image? I think SCL is P9_19, SDA P9_20, but want to confirm
  • [01:07:09] <DLPeterson> i guess it must be define in the device tree file somewhere
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  • [01:09:02] <zmatt> you can check device tree (decompile the dtb, find its source, or inspect the live version in /proc/device-tree )
  • [01:09:11] <zmatt> or check the actual pinmux
  • [01:09:24] <DLPeterson> how do you check the actual pinmux?
  • [01:11:35] <zmatt> /sys/kernel/debug/pinctrl/44e10800.pinmux
  • [01:11:59] <zmatt> the file "pins" contains the raw pinmux
  • [01:13:59] <zmatt> I have a spreadsheet with pin data aggregated from multiple sources, I personally find it useful -> https://docs.google.com/spreadsheets/d/1CK5c-Cs8G1RtzGo-J3VJsD9m5K-fp06AncgeYWsdjSU/edit
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  • [01:15:10] <DLPeterson> zmatt, thanks that is super helpful
  • [01:15:11] <zmatt> the Pinmux tab is generic for the AM335x, the BBB tab is the same table but customized for the BBB (e.g. hiding unusuable functions, showing which pins corresponding to expansion headers
  • [01:15:27] <DLPeterson> zmatt, in the pins file, are the pin numbers with respect to the AM3358?
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  • [01:17:04] <zmatt> the pin numbers are basically the only way to unambiguously identify IO pins of the Subarctic die (i.e. AM335x / DRA61x parts)
  • [01:17:16] <zmatt> they're also indices in the pinmux array in the control module
  • [01:17:49] <zmatt> so 0x44e10800 + 4 * (pin_number) is the address of the pinmux register
  • [01:19:35] <zmatt> for the BBB the most relevant tabs are BBB and BBB2, and possibly Boot and Elec
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  • [01:22:05] <zmatt> (apart from graying out unusable functionality, the BBB tab is a superset of the information found on the Pinmux tab
  • [01:22:08] <zmatt> )
  • [01:23:13] <DLPeterson> hmm
  • [01:23:32] <DLPeterson> do you know if i2cdetect actively probes the bus each time it is run
  • [01:23:33] <DLPeterson> ?
  • [01:23:41] <DLPeterson> or is it done on boot or something
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  • [01:24:07] <zmatt> I'm not sure how much auto-detection is done on the i2c bus, if any (other than by bone_capemgr)
  • [01:24:20] <zmatt> there's in general no reliable way to identify i2c devices
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  • [01:24:27] <DLPeterson> :)
  • [01:24:36] <zmatt> and attempts to probe may actually muck things up
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  • [01:25:49] <zmatt> generally you'd explicitly list the i2c devices on the bus via device tree
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  • [01:28:00] <zmatt> DLPeterson: btw, I did mention the i2c-2 mux: 04:14 < zmatt> note that you can also connect devices to i²c 2, which in a typical bbb device tree is already enabled and muxed to { P9.20, P9.19 } for cape detection
  • [01:28:58] <zmatt> what i2c device are you trying to use?
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  • [02:00:53] <DLPeterson> zmatt, I'm trying to use a Invensense MPU-6050, don't have a preference on which peripheral of the BBB; I have no capes
  • [02:01:30] <zmatt> do you happen to know if it has a kernel driver?
  • [02:01:51] <zmatt> as, it does
  • [02:06:51] <zmatt> see https://groups.google.com/forum/#!topic/beagleboard/hqqecmOjpTU for efforts to get the driver to work
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  • [02:11:47] <zmatt> sounds like the driver currently requires patches to work, and most people just use i2cdev from userspace
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  • [02:26:38] <zmatt> DLPeterson: sounds like the MPU-6050 also supports SPI instead of I2C
  • [02:31:26] <zmatt> oh, nm, that's the MPU-6000
  • [02:31:36] <zmatt> so you're stuck with i2c, too bad
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  • [04:51:41] <Guest29846> Hi
  • [04:52:29] <Guest29846> I want to know, Can I flash the emmc using tftp server?
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  • [04:53:31] <Guest29846> Any one?
  • [04:54:38] <tbr> depends
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  • [04:55:28] <zmatt> you can, though I'm not sure anyone has a ready-to-go setup for that
  • [04:56:11] <zmatt> Guest29846: I've use netbooting for baremetal applications succesfully
  • [04:57:48] <zmatt> however that's just ROM directly netbooting the application
  • [04:58:33] <zmatt> for flashing you'd have ROM netbooting u-boot (hopefully you can build a sufficiently small version to avoid the need for an SPL)
  • [04:58:57] <zmatt> which would need to be preconfigured to netboot the kernel
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  • [04:59:31] <zmatt> and you'd need an NFS server hosting the root filesystem containing the eMMC flasher
  • [05:00:17] <zmatt> definitely a non-trivial exercise, though once setup it definitely yields a pretty chill way to (re)flash a BBB\
  • [05:00:48] <zmatt> I once made such a setup for a dm814x
  • [05:02:09] <zmatt> not for reflashing but just for kernel/bootloader development: edit & compile on my laptop, press reset button on the target which fetches the newly compiled version straight from my laptop
  • [05:02:26] <zmatt> (big bonus: unbrickable setup)
  • [05:02:29] * das (~das@225.5.80.79.rev.sfr.net) Quit (Ping timeout: 246 seconds)
  • [05:03:43] <zmatt> the simplest way to host BOOTP + TFTP btw is using dnsmasq
  • [05:03:52] <zmatt> much simpler than more descriptions I've seen on the net
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  • [05:16:03] <zmatt> note BTW that USB-booting works exactly the same as Ethernet booting, except via RNDIS
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  • [05:21:44] * zmatt hunts for the resistor he needs to verify his setup actually still works
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  • [05:30:33] <zmatt> Guest29846: my dnsmasq config for this purpose -> http://gerbil.xs4all.nl/dnsmasq-bbb.conf
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  • [05:34:29] <zmatt> that should take care of getting u-boot (or SPL if used) onto the beaglebone if you configure it for netbooting (pull sysboot0 up, pull sysboot2 down)
  • [05:34:49] <zmatt> the rest is left as exercise for the reader ;P
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  • [06:01:17] <Phani> Hi
  • [06:01:31] <Phani> Does beaglebone supports Android
  • [06:02:16] <Phani> when I did some googling - I saw the support for beaglebone with respect to Android started (and stopped) at Jelly bean
  • [06:02:25] <Phani> Is there any specific reasn for this?
  • [06:03:00] <Phani> All I wanted to know was will there be some support if start working on Andorid (JB) for beagle bone - If I get stuck?
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  • [06:10:10] <tbr> not from the people here at least
  • [06:10:33] <tbr> TI or one of its partners might have commercial support
  • [06:11:04] <tbr> there might be something like rowboat, but I don't know details
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  • [07:14:16] <zmatt> Phani: http://lmgtfy.com/?q=beaglebone+android
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  • [07:18:22] <gurki> thing is ... if you wanna go android, bbb prob is the wrong device for you
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  • [07:18:39] <gurki> no "real" gpu acceleration, just a single core... blah. whatever.
  • [07:18:40] <gurki> ^^
  • [07:18:44] <gurki> hes gone.
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  • [07:19:48] <zmatt> gurki: gpu works fine
  • [07:20:31] <gurki> like ... with acceleration, full hd and stuff?
  • [07:20:45] <gurki> i only ever used bbb for its ios ... id switch to raspi should i need gpu
  • [07:21:14] <zmatt> it has the same 3D GPU as, say, the OMAP 3 series
  • [07:21:25] <gurki> nice :o
  • [07:21:36] <gurki> i guess i got sth wrong here ...
  • [07:22:25] <zmatt> lcdc is a bit crappy as display subsystem, e.g. no compositing there so you need to do that in the gpu (or cpu, but that sounds less desirable)
  • [07:23:16] <zmatt> lack of video/camera input to be composited with other stuff makes that less of a problem though
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  • [07:24:21] <zmatt> no X support yet, but android doesn't use X anyway does it?
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  • [07:27:21] <zmatt> and dunno whether full HD is possible... it ran pretty smoothly on 1280x1024 but it didn't negotiate the (larger) true screen size as frame buffer size even though I think lcdc should support it
  • [07:27:34] <zmatt> iirc the hdmi framer imposed some restrictions
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  • [07:30:23] <gurki> thx for all that info :)
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  • [07:32:51] <zmatt> the official graphics SDK has a structure similar to https://github.com/powervr-graphics/Native_SDK ... but much older and almost no examples
  • [07:33:30] <zmatt> I've been considering trying to see if combining the am335x drivers with those OGLES/OGLES2 demos actually works
  • [07:33:34] <zmatt> should, I think
  • [07:36:05] <zmatt> other interesting experiments would be getting wayland running on it (for windowing) or in the opposite direction use it without fbdev (for lower overhead)
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  • [07:47:11] <zmatt> the rpi might still be nicer for graphics though, given that it's primarily a GPU (with an ARM core stuck to the side), dunno if anyone ever compared their abilities
  • [07:47:40] <zmatt> in both cases the limiting factor is probably software/driver support rather than the raw hardware capability
  • [07:48:28] <zmatt> at least the rpi gpu is documented (unlike the SGX)
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  • [07:56:12] <nyo_> guys, I have some weird stuff on connecting with serial line to beaglebone, actually the serial freeze after like 30 seconds. I have to close minicom and reopen it to get back to BBB shells. is this behavior normal?
  • [07:56:51] <nyo_> it does freeze also if I leave a command like top working..
  • [07:57:18] <nyo_> it's my 1st time using serial so if there is some behavior that I'm not aware..
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  • [08:00:19] <nyo_> hardware and software flows are off...
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  • [08:57:20] <nyo_> funny, the serial doesn't crash using windows, so it must be a driver / module problem
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  • [10:02:06] <hbg> Hi
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  • [10:45:39] <nyo_> it was the gnd pin, I think I solved my usb-serial issue with bbb :-O
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  • [13:12:38] <Australiabb> Hi, I tried using a rev B board (Angstrom) and had problems with running out of disk space when updating software. Does the rev C with Debian have the same sort of problem or is the extra 2GB of flash more than enough?
  • [13:13:16] <tbr> if you are concerned with space, use a large microsd
  • [13:14:07] <tbr> IMHO you only run into issues if you want the packages for everything and the kitchensink installed
  • [13:14:48] <Australiabb> Do you mean run from the SD instead of flash?
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  • [13:15:54] <tbr> yes
  • [13:17:18] <Australiabb> Is there a noticeable speed reduction when running from flash?
  • [13:18:02] <tbr> that will entirely depend on the characteristics of the sd card
  • [13:18:25] <tbr> there are some that are really good at random access, others "suck"
  • [13:19:14] <tbr> the advertized speed is in most cases irrelevant and has no correllation
  • [13:19:35] <samael> i'm interested it this, too. any advice on which uSD to use in order to reach the same performance of the internal eMMC?
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  • [13:21:54] <Australiabb> Do I boot from the SD card using the installer image, then resize the partitions, is that possible?
  • [13:23:24] <myself> Samsung EVO cards take top honors: http://thewirecutter.com/reviews/best-microsd-card/ and http://www.tomshardware.com/charts/microsd-cards-2014/-4-Random-Write-512-KB-MB-s,3483.html
  • [13:24:54] <myself> Wow. The performance disparity in Tom's review is almost inexplicable. That's just... wow.
  • [13:25:59] <myself> All the Transcend cards place in the top third, too.
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  • [13:34:07] <tbr> myself: keep in mind that those "tests" usually are for linear loads. like writing and reading images, video etc
  • [13:34:39] <tbr> I would /never/ base a buying decision on such a review. for reasons, see above.
  • [13:36:21] <myself> tbr: I picked the 4k random write test since that's usually closer to how a root filesystem gets used, and yes you're right, the results are very different than the sequential write test.
  • [13:36:44] <tbr> *nod*
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  • [13:37:55] <samael> also, there seems to be no specific/industrial products in those reviews, which could be interesting to see
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  • [13:41:43] <Australiabb> Is the Debian image running from an SD card compatible with the Rev B board? I couldn't find anything online about compatibility.
  • [13:42:21] <tbr> yes, I run one of the debian images on both a BBW and a BBB RevA5
  • [13:42:55] <tbr> just don't use a flashing image but a "normal" image
  • [13:43:40] <Australiabb> Thanks, I had no idea.
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  • [15:57:33] <jsabeaudry> What is responsible for the leds on the RJ45 connector?
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  • [15:58:04] <jsabeaudry> Every ~50 boots, those leds do not turn on
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  • [15:58:26] <jsabeaudry> ip link says eth0 is DOWN
  • [15:58:30] <nerienna> Phy issue I think
  • [15:59:04] * idwer_ is now known as idwer
  • [15:59:11] <jsabeaudry> dmesg whines every boot about the phy but I thought it was normal
  • [15:59:59] <nerienna> do you connect the RJ45 before or after boot?
  • [16:00:40] <jsabeaudry> before
  • [16:01:09] <jsabeaudry> I leave it connected, and I powercycle over and over again to repro
  • [16:01:33] <jsabeaudry> took me 43 tries yesterday and 57 today
  • [16:02:16] <jsabeaudry> Is all that stuff about the phy not found normal in boot? http://pastebin.com/pF2bZ893
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  • [16:04:56] <tbr> IIRC there are two interfaces and it doesn't find the second one. Or at least that's how I _guessed_.
  • [16:06:25] <zmatt> device tree erroneously enables the second one
  • [16:07:20] <zmatt> messages about mdio:01 are harmless
  • [16:07:38] <zmatt> the ones about :00 aren't
  • [16:07:49] <nerienna> but there was a hardware issue - somthing with a capacitor, if I remember correctly
  • [16:07:54] <zmatt> finding it on :02 is due to a bug that I thought was fixed
  • [16:08:07] <zmatt> nerienna: the true cause has never been determined with certainty
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  • [16:08:14] <zmatt> other than that the LAN chip
  • [16:08:22] <zmatt> may not be getting reset quite right
  • [16:08:46] <zmatt> (or maybe is buggy)
  • [16:09:53] <zmatt> https://groups.google.com/d/topic/beagleboard/9mctrG26Mc8/discussion is the topic about it
  • [16:10:11] <nerienna> yes, I have more than 10 beaglebones at work, some of them have the problem, others don't
  • [16:10:33] <zmatt> the LAN chip is apparently also sensisitve to ESD
  • [16:11:50] <zmatt> still, the cases where it results in phy address 2 (even though PHYAD1 has a pull-down at the cpu side, a pull-down at the PHY side, and an external pull-down ... how the fuck does the PHY manage to sample it high?) are reasonably easy to work around
  • [16:12:09] <zmatt> hardware (the MDIO controller) already scans all 32 phy addresses
  • [16:12:48] <zmatt> ideally the bootloader would then change the phy address to 0 (it's reconfigurable via a PHY register), but no such code has been written yet agaik
  • [16:13:01] <zmatt> instead PHY-search code was added to the kernel as a hack
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  • [16:13:52] <zmatt> properly resetting the PHY would also fix the problem, but you can't since its reset is tied to the global nRESET
  • [16:14:07] <myself> that's just an xacto blade away, though ;)
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  • [16:15:22] * zmatt looks at the PHY
  • [16:16:03] <zmatt> if you're comfortable disconnecting its nRESET and connecting it to a GPIO, and patching the bootloader to assert its reset for the dataspeed-specified minimum about of time, that go for it
  • [16:16:29] <zmatt> since by default the amount it is reset is... cutting it very close
  • [16:17:26] <zmatt> an easier alternative would be an external reset-hold circuit on the nRESET pin, accessible on the expansion header
  • [16:18:26] <zmatt> also remove one of the caps, or compensate with a heavier pull-up
  • [16:19:18] * Australiabb (3a077cb8@gateway/web/freenode/ip.58.7.124.184) Quit (Ping timeout: 246 seconds)
  • [16:20:16] <zmatt> since... https://groups.google.com/d/msg/beagleboard/9mctrG26Mc8/y0YOSrDKZgIJ
  • [16:20:31] <zmatt> https://17376924468624948387.googlegroups.com/attach/266cab04a0e46cb/power-on%20reset.png?part=0.1&view=1&vt=ANaJVrEazk4HtGdiEi2OYcy-Jg61BtC252zJzpGdnjHs5K8fj7ujPpxK9S7UqCwyTIt9rdiKdLQ0cghBUuvDE2vHpLggTtVSDDxGkDXnzwdrhU2sQGHQXls
  • [16:20:44] <zmatt> that red line is nRESET
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  • [16:21:06] <zmatt> not exactly the shape I'd personally want to see in digital signal
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  • [16:22:50] <jsabeaudry> zmatt, Wow thanks for all that info, glad to see we are not alone with that issue
  • [16:23:41] <jsabeaudry> zmatt, Currently reading through the thread about it, if I understand you correctly, there is no software patch available yet?
  • [16:23:49] <zmatt> there is one
  • [16:24:03] * nerdboy (~sarnold@gentoo/developer/nerdboy) Quit (Excess Flood)
  • [16:24:06] <zmatt> and it should be included in all kernels from rcn-ee afaik for quite a while now
  • [16:24:13] <zmatt> no bootloader-level patch yet though
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  • [16:25:04] <jsabeaudry> We are still running with 3.8.13-bone53, any idea how recent the kernel must be to get the patch?
  • [16:25:12] <zmatt> I'd still prefer to see a hardware patch, since if the PHY can missample that strapping option (again: it has internal pull-down in both PHY and AM335x, *and* external pull-down), it can missample anything
  • [16:25:18] * nerdboy (~sarnold@gatekeeper.gentoogeek.org) has joined #beagle
  • [16:27:26] <zmatt> and I suspect the problem is 1. the reset-time is borderline too short and/or 2. the reset signal shape is dubious, far too big a cap for its pull-up resistor
  • [16:28:58] <zmatt> jsabeaudry: is your problem consistently reproducible btw? because that would make an interesting test case
  • [16:29:32] * adibis missed the start of the conversation but it seems interesting
  • [16:29:52] <zmatt> adibis: it's about the ethernet PHY issue
  • [16:30:02] <zmatt> it sometimes missamples strapping options at reset
  • [16:30:06] <zmatt> somehow
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  • [16:30:38] <zmatt> I've done measurements and noticed the reset time is making a really close call w.r.t. the minimum specified in the datasheet
  • [16:31:09] * calculus (~calculus@gentoo/user/calculus) Quit (Ping timeout: 244 seconds)
  • [16:31:12] <adibis> minimum time for the rest of the values to stabilize?
  • [16:31:36] <zmatt> just minimum time specified for PHY nRESET to be low
  • [16:31:59] <zmatt> the phy doesn't require nRESET to be held low during/after power-on, it just requires one good proper reset before you start using it
  • [16:32:02] <adibis> how is there a software patch for this?
  • [16:32:10] <adibis> Or is it just for soft reset?
  • [16:32:22] <zmatt> by working around the misbehaviour that results from it
  • [16:32:40] <zmatt> which so far only appears to be PHYAD[1] being 1 when it should be 0
  • [16:32:52] <zmatt> hence the PHY appears at phy address 2 instead of 0
  • [16:32:52] <adibis> so just re-program the default options before first use?
  • [16:32:55] <jsabeaudry> zmatt, I seem to get it every ~50 boots or so, I wouldn't call it consistent :)
  • [16:33:13] <zmatt> they don't use that either, they just scan for the phyad and then use that afaik
  • [16:33:24] <zmatt> even though you can indeed reprogram (nearly) all strapping options
  • [16:33:55] <adibis> seems faster than scanning every time. (?)
  • [16:34:09] <zmatt> adibis: well it's done once at boot
  • [16:34:19] <zmatt> and otherwise would need to be done... once at boot
  • [16:34:28] <zmatt> also, the MDIO controller does the scanning
  • [16:34:40] <zmatt> (always, whether you want it to or not)
  • [16:35:44] <adibis> hmm - is the reset ciruit re-programmable or fixed hardware dependent?
  • [16:36:02] <zmatt> people have noticed that adding more capacitance to nRESET makes the issue appear more consistently, maybe I'll try that if I find the time
  • [16:36:25] <zmatt> some aspects are programmable, but not really any useful ones
  • [16:37:30] <zmatt> the power-on-reset is generated by the PMIC
  • [16:37:49] <zmatt> which is reprogrammable, except the custom settings are lost when the PMIC enters OFF-mode
  • [16:38:24] <zmatt> the power-on sequence always comes from its EEPROM, and TI refuses to let customers reprogram that
  • [16:39:02] <zmatt> power-on-reset drives nRESET low, which is tied directly to the PHY
  • [16:39:43] <zmatt> there's also a big cap and small pull-up on nRESET
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  • [16:40:03] <zmatt> those people have fiddled with, apparently with successs
  • [16:42:05] <zmatt> hmmmmm
  • [16:42:08] <zmatt> I was thinking
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  • [16:42:32] <zmatt> because adding capacitance making the problem worse while removing capacitance making it better really puzzled me for some time
  • [16:42:47] <zmatt> the chips may however have different thresholds
  • [16:43:00] * mythos (~mythos@unaffiliated/mythos) Quit (Ping timeout: 264 seconds)
  • [16:43:49] <zmatt> big enough capacitance might perhaps mean the PHY is taken out of reset first, then the AM335x which subsequently asserts its reset-hold circuit causing the PHY to be reset again, but waaaay too briefly
  • [16:44:23] <myself> and it's possibly that second blip that causes the bug?
  • [16:44:42] <zmatt> the PHY needs something like a 25 ms reset pulse iirc
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  • [16:45:53] <zmatt> the AM335x generates 250 ns reset pulse
  • [16:46:05] <myself> I'm not familiar with "reset-hold circuitry", that seems like it would complicate things
  • [16:46:13] <zmatt> though actually the cap would stretch that again
  • [16:46:29] <myself> only if the pulldown is stiff enough to discharge the cap
  • [16:46:40] <zmatt> assuming... that
  • [16:47:07] <zmatt> we really need a scope capturing this when it goes wrong
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  • [16:47:59] <zmatt> I pondered whether it would help for software to detect a cold reset, reconfigure the reset-output pulse of the AM335x and execute a warm reset
  • [16:48:10] <zmatt> but the max configurable reset pulse is 255 cycles @ 24 MHz
  • [16:48:26] <zmatt> which is still only 10 microseconds
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  • [16:49:48] <zmatt> the PHY actually requires 100 μs as minimum nRESET input time
  • [16:50:03] <zmatt> and power supplies need to be stable for at least 25 ms at that time
  • [16:50:46] <myself> huh, jkridner's not on right now. I was gonna say, I'd love to help scope *all* the things if he's got a board handy that exhibits the problem reliably
  • [16:51:46] <zmatt> I wonder if the warm-reset pulse even resets the PHY at all
  • [16:52:31] <zmatt> but, the PHY is wonky anyway
  • [16:52:35] <myself> I wonder if there's anything from the PHY we could monitor to independently confirm that
  • [16:52:39] <zmatt> see this post about something that happened to me https://groups.google.com/d/msg/beagleboard/9mctrG26Mc8/UwgD7xbEllYJ
  • [16:52:48] <zmatt> phy reset you'll notice if you have link
  • [16:52:50] <zmatt> link leds go out
  • [16:52:58] * jedahan (~textual@subtle/user/jedahan) Quit (Quit: My Mac has gone to sleep. ZZZzzz…)
  • [16:53:09] <zmatt> and then on again due to autonegotiation
  • [16:53:23] <zmatt> which also means the link partner will log the link down-up
  • [16:53:31] <zmatt> unfortunately, u-boot *also* resets the PHY
  • [16:53:36] <zmatt> the kernel yet again resets the PHY
  • [16:53:58] <zmatt> presumably to try as hard as possible to confuse the link partner :P
  • [16:54:12] <jsabeaudry> hahahah
  • [16:54:38] <zmatt> crap I really need to do shopping before the stores close
  • [16:54:44] <jsabeaudry> What is the repo for a kernel that contains the patch, https://github.com/RobertCNelson/linux-dev seems to still be at 3.8.13-bone53
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  • [16:55:32] <zmatt> it should be included all recent kernels including the ancient 3.8.x series... the versions are mentioned somewhere in the forum thread
  • [16:56:24] <zmatt> it was solved a short time after "bone47"...
  • [16:56:30] <zmatt> according to rcn-ee
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  • [16:57:07] <jsabeaudry> zmatt, ok, I'll spin it for a 100 times with bone70 once I find the code for it
  • [16:57:26] <zmatt> apt-get install?
  • [16:57:45] <jsabeaudry> Oh, I got the binary, I'm looking for the source
  • [16:57:58] * panto_ (~panto@ix-13-15.mse1.L78-London.as6453.net) Quit (Client Quit)
  • [16:58:04] <zmatt> https://github.com/RobertCNelson/linux-stable-rcn-ee/releases
  • [16:58:21] <zmatt> for 3.8 series you'll probably need to scroll back waaaay back
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  • [16:59:54] <zmatt> since those releases aren't part of any head, it doesn't seem to automatically pull the tags for it
  • [17:00:03] <zmatt> maybe explicitly fetching with --tags fixes that
  • [17:01:07] <zmatt> git fetch origin 3.8.13-bone70 should also get you the release as FETCH_HEAD (from which you can then make a branch)
  • [17:01:46] <zmatt> (or replace "origin" by whatever the name you give this repo as remote)
  • [17:01:50] <jsabeaudry> great! Many thanks!
  • [17:02:06] <zmatt> note also that 3.8.x is ancient history
  • [17:02:15] <zmatt> consider moving to 4.1.3 :P
  • [17:03:18] <zmatt> -bone72 actually seems the latest 3.8.13
  • [17:03:31] <samael> is the 4.1 able to mananage dt overlay made for capemgr?
  • [17:03:49] <zmatt> 4.1 has both bone_capemgr and proper mainlined overlays
  • [17:04:27] <zmatt> (i.e. I disable bone_capemgr in my kernels and DTs to free up the relevant pins since we don't use any standard capes, still have overlays using the new mainlined mechanism)
  • [17:06:32] <zmatt> the new configfs mechanism also doesn't require bullshit CAPE-metadata when loading a custom overlay \o/
  • [17:07:40] <samael> good. next question then: is there some documentation to help morons like me to migrate from .dts made for capemgr to this phantasmagoric proper mainlined mechanism? :)
  • [17:08:42] <zmatt> same dtbos are accepted -- any metadata (properties of the root node) is ignored
  • [17:09:34] <zmatt> the minimal overlay source code is now: /dts-v1/; /plugin/; / { target = <&foo>; __overlay__ { /*...content...*/ }; };
  • [17:10:00] <zmatt> target-path = "/path/to/node"; is allowed as alternative to targeting by label
  • [17:10:21] <zmatt> loading:
  • [17:10:28] <zmatt> make a subdir (any name) in /sys/kernel/config/device-tree/overlays
  • [17:10:38] <zmatt> Inside it you will find three files: dtbo, path, and status. You can either write the path of the dtbo file to path, or write the contents of the dtbo file to dtbo. Assuming no error occurs, the status will change from unapplied to applied.
  • [17:11:37] <zmatt> It is possible to (attempt to) unapply an overlay by removing the corresponding directory you created. It is even possible this will succeed without kernel panic. You can (currently) only remove overlays in reverse order you added them, not remove one from the middle of the stack.
  • [17:12:29] <zmatt> note that targeting by label (as before) requires the main DT to be compiled with symbols (cmdline option -@), but that's the case for all standard DTs
  • [17:12:40] <samael> sounds exciting. and what is the equivalent of the old `cat $SLOTS`? should i just take a look at the subdirs in there?
  • [17:12:44] <zmatt> yep
  • [17:13:38] <zmatt> hopefully ls -U also gives you the order
  • [17:13:45] <samael> thanks a lot. will try it asap
  • [17:14:13] <zmatt> I'm afk for a bit
  • [17:15:52] <samael> remember: chocolate and beer!
  • [17:15:56] <samael> :)
  • [17:19:32] <jsabeaudry> Is there a karma bot here?
  • [17:19:49] <jsabeaudry> +1 zmatt
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  • [18:38:14] <zmatt> :D
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  • [22:37:34] <navaati> hi
  • [22:38:43] <navaati> I'm trying to boot a bone black from the serial (really boot from the rom code, not chainload from an uboot or anything).
  • [22:39:54] <navaati> the section 6.7.2 page 58 of the system reference manual says that on pressing the button near the sd card port, the boot order should be spi -> sd -> usb -> uart
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  • [22:40:11] <navaati> however i still see the messages from my (broken) mlo on the emmc
  • [22:40:13] <navaati> any idea ?
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  • [22:42:30] <thurgood_> have you tried blowing away the mlo on eMMC
  • [22:42:54] <navaati> well i can't since i can't boot
  • [22:43:11] <navaati> (i can't use sd for some reason)
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  • [22:43:54] <thurgood_> how long are you holding the boot button?
  • [22:44:36] <navaati> from before i reset the board to after the broken's mlo messages appear
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  • [22:44:46] <navaati> ah, however i only tried with hot reset…
  • [22:44:58] <thurgood_> hot reset does not work
  • [22:45:11] <thurgood_> need to pull power completely then reapply power
  • [22:45:58] <navaati> ok, i'm, err, trying to try at the moment (my kermit seems stuck)
  • [22:47:21] <navaati> right, the mlo messages don't appear. nothing else appear (the doc talks about some CCCC letters), but thanks, that seems better already
  • [22:47:56] <thurgood_> try with an sd... after doing a hard reset
  • [22:52:40] <navaati> as i said, i have an sd but nothing to flash it
  • [22:53:05] <navaati> (and tbh i'm not exactly sure my sd does work)
  • [22:53:51] <thurgood_> oh...
  • [22:54:11] <navaati> mmmh i tried to send a mlo through the xmodem protocol after cold-booting with the button pressed, but it does nothing
  • [22:54:36] <navaati> maybe there is some timeout for the spi and usb steps to fail
  • [22:54:47] <thurgood_> USB SD readers are pretty cheap if you don't have one in your system
  • [22:55:11] <thurgood_> can probably pick one up for 5-10 dollars
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  • [23:04:06] <navaati> yeah, but not tonight (1am here) and mostly being able to boot custom stuff solely over uart (read: without physical sd card swapping) is interesting for factory and maintainance and this kind of stuff
  • [23:04:09] * jsst (~jsst@kbl-mdb5926.zeelandnet.nl) Quit (Ping timeout: 252 seconds)
  • [23:04:22] <navaati> but that would be the reasonable thing to do, sure :)
  • [23:04:46] <navaati> i'll continue reading the am335x doc, thanks for the cold boot trick !
  • [23:07:15] <thurgood_> ok
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  • [23:23:48] <navaati> "The ROM code will ping the host 10 times in 3s to start x-modem transfer.", ok i just need to be crazy fast…
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  • [23:35:16] <ds2> Mmmmmm xmodem
  • [23:35:25] <ds2> wonder if it will also do xmodem-1024
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  • [23:46:32] <navaati> it apparently *is* xmodem-1k mode
  • [23:47:09] <navaati> see section 25.1.8.5.2 of the big fatass am335x 4000-ish pages doc
  • [23:50:17] <navaati> still xmodem does not react when i bootup the board…
  • [23:54:10] <ds2> sysboot setup right?
  • [23:57:09] <navaati> ds2, do you mean the values of the pins ? i guess, it's beaglebone black engineers choice, not mine ^^
  • [23:57:21] <ds2> yes
  • [23:57:24] <ds2> read the schematics
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  • [23:59:00] <navaati> according to the bbb doc, the lower bits of sysboot, with the button down, are 11000b
  • [23:59:35] <navaati> leading to a boot order of spi -> sdcard -> usb -> uart