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  • [00:00:36] * 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'
  • [00:00:36] * Set by KotH!~attila@erica.kinali.ch on Wed Jul 15 13:55:07 UTC 2015
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  • [00:46:52] <Ivy> I can't for the life of me get Arch ARM to work on BBB
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  • [03:23:17] <yates> it looks like my custom kernel build for a bbb-compatible board is generating a random mac address on every boot. any idea why? i thought it's supposed to take the address from the eFUSE.
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  • [03:23:45] <yates> wait, that may not be corect. nm
  • [03:28:11] <yates> yes, it is correct.
  • [03:28:23] <yates> any idea why? this is happening?
  • [03:32:54] <yates> any ideas, veremit?
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  • [04:17:55] <yates> anyone?
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  • [04:36:55] <yates> zmatt: you thought i was bad about staying on the channel? Ivy was in and out in 2 minutes!
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  • [05:14:30] <wen> join
  • [05:14:43] <wen> help
  • [05:16:28] * vagrantc hands wen a /
  • [05:19:03] <wen> when I do with this http://prosauce.org/blog/2013/2/11/embedded-trust-p2-u-boot-secured-boot.html,I move the mlo and u-boot.img to my beaglebone,but my beaglebone not work
  • [05:19:27] <wen> what wrong with my beaglebone black
  • [05:20:22] <wen> hand
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  • [05:35:52] <wen> help
  • [05:37:50] <wen> when I take tpm_nvdefine,it come Tspi_NV_DefineSpace failed: 0x00000001 - layer=tpm, code=0001 (1), Authentication failed
  • [05:38:10] <wen> who can help me
  • [05:38:35] <wen> thanks
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  • [05:48:37] <zmatt> wen: this is pointless, you cannot do secure boot on a bbb
  • [05:49:20] <zmatt> "secure boot" using an external TPM is only as secure as the connection between BBB and the TPM, which in this case is a trivial to attack i2c bus
  • [05:49:52] <zmatt> (and if you don't need security against attackers with physical access, you don't really need a TPM in the first place)
  • [05:50:56] <wen> but I want make beaglebone auto change PCR
  • [05:51:13] <wen> and now I can't get it
  • [05:51:46] <wen> I use cryptocape
  • [05:52:43] <zmatt> as for why it's not working or what that error means, I have no idea. but please realize that even if you get it to work, you will not have secure boot
  • [05:54:08] <wen> why?my cryptocape have a tpm
  • [05:55:18] * skhreze (~debian@user-94-254-224-115.play-internet.pl) Quit (Ping timeout: 250 seconds)
  • [05:57:17] <zmatt> like I said, you cannot achieve secure boot with an external TPM.
  • [05:58:16] <wen> ok,but how can I change the PCR
  • [05:58:54] <wen> my tpm_extend is not useble
  • [05:59:25] <zmatt> here's a summary of the issue I once emailed someone: http://pastebin.com/RJ0TAg2a
  • [05:59:34] <zmatt> and I have no idea why you can't extend the PCR
  • [06:00:02] <wen> ok,thank you for your help
  • [06:00:47] <zmatt> (someone = the cryptocape people actually)
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  • [06:01:54] <wen> my beaglebone does't have tpm_extend
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  • [06:03:43] <wen> forgive me,I can't open it
  • [06:04:00] <wen> can you help me?
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  • [06:07:11] <zmatt> no
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  • [06:12:31] <wen> thank you all the same
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  • [06:18:19] <zmatt> good luck with your effort to get not-actually-secure boot working
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  • [06:19:44] <zmatt> the cryptotronix tpm page mentions they had trouble getting it to work also, and the page you linked to is very old and involved ancient uboot and linux versions, so it will probably not be easy to get this stuff to work at all
  • [06:21:06] * TheoMurpse (~TheoMurps@cpe-72-191-48-158.satx.res.rr.com) has joined #beaglebone
  • [06:21:22] <CathyInBlue> Any attempt to secure a computer that does not store keys directly in the CPU is bound to fail.
  • [06:21:37] <zmatt> yep
  • [06:21:57] <zmatt> you can try to extend the boundary of "CPU" with lots of epoxy of course
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  • [06:23:01] <wen> ok
  • [06:23:27] <CathyInBlue> Otherwise, the keys must traverse an external bus at least once, whereby it is vulnerable to attack. Even then, data to be encrypted must traverse the bus one way and the same data encrypted must traverse the bus the opposite way, ultimately giving enough examples to discover the key.
  • [06:23:47] <zmatt> CathyInBlue: the latter is not true
  • [06:23:54] <CathyInBlue> No?
  • [06:24:17] <zmatt> no, that's called a known-plaintext attack and if a cipher isn't secure against them it's considered broken
  • [06:24:48] <zmatt> a TPM *is* useful to store keys and only allow use of them (but not copying them)
  • [06:25:48] <zmatt> e.g. if you store an SSH private key in that way, then if your system is compromised the attacker can use your private key but as soon as you cut him off (e.g. unplug network) he loses that access again
  • [06:26:29] * vagrantc didn't know botnets had gender
  • [06:26:32] <zmatt> of course such a thing is just called an authentication token
  • [06:27:00] <ds2> security by trying to hide things in a box is a waste of time
  • [06:27:23] <CathyInBlue> Security through obscurity.
  • [06:27:25] <ds2> security should be in the head of the users
  • [06:27:35] <zmatt> ds2: lol, that's never gonna happen
  • [06:27:56] <vagrantc> thank you trivially brute-forceable passwords.
  • [06:28:06] <ds2> then security will never happen either
  • [06:28:07] <zmatt> and sealing things in a box *can* result in real security benefits
  • [06:28:13] <zmatt> but you do need to understand their properties
  • [06:28:22] <CathyInBlue> Air gaps can be bridged.
  • [06:28:45] <wen> if I want use beaglebone and cryptocape to achieve secure boot,what shall I do?who can help me?
  • [06:28:56] <vagrantc> security isn't an event, it's a continual process of evaluation and risk and threat model mitigation
  • [06:29:30] <zmatt> wen: noone can help you achieve secure boot with an external TPM since it is impossible to achieve secure boot with an external TPM
  • [06:29:37] <ds2> pray to the diety of your choice
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  • [06:29:48] <zmatt> (assuming you mean a boot process secured against attackers with physical access)
  • [06:30:02] <ds2> or hope that luck favors you in getting quantum mechanics to line up for you :D
  • [06:30:18] <zmatt> it helps to start by clarifying for yourself what exactly you mean by "secure" ... secure what? against whom?
  • [06:30:42] <wen> ok
  • [06:30:55] <wen> thanks
  • [06:31:15] * vagrantc wants to keep a laptop secure against the chickens in the yard
  • [06:32:19] <zmatt> if your need security against physical attackers, your best bet is using an enclosure with tamper-detection that causes essential keys to be erased. if your design is custom then the first attack on it will hopefully fail, and since the attacker only gets to try once security is achieved
  • [06:32:59] <zmatt> this is especially true if the attacker doesn't expect such a mechanism is in place. if he/she does the problem gets much harder
  • [06:33:06] <vagrantc> yeah, but one of them can fly.
  • [06:33:07] <zmatt> (and dependent on the level of sophistication of the attacker)
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  • [06:35:20] <zmatt> you can also hope to keep the system secure once booted, even if physical access is subsequently gained. this is somewhere inbetween "reasonably doable" and "very very hard" depending on expected level of sophistication of the attacker
  • [06:36:22] <wen> if that,what shall I do
  • [06:36:37] <vagrantc> wen: that's a bit of a broad question...
  • [06:36:46] <wen> achieve system secure boot
  • [06:37:11] <zmatt> if you cannot even read, noone can help you.
  • [06:37:34] <wen> sorry
  • [06:39:10] <zmatt> clarify for yourself what your security goals are. do research. learn about how attacks work and security mechanisms fail in practice.
  • [06:40:31] <zmatt> in particular, until you understand why an external TPM connected by insecure means to the CPU can _never_ get you secure boot, there's no point in continuing.
  • [06:41:11] <zmatt> this particular security failure is a well known one and plenty has been published about it
  • [06:41:54] <wen> I think if link beaglebone with IIC,may be I can get it
  • [06:41:54] <zmatt> (some TPM-equipped platforms could be attacked by literally just bending a pin)
  • [06:41:54] * lektrik (~mayday_ja@69.156.55.47) Quit (Ping timeout: 256 seconds)
  • [06:42:41] <zmatt> we're going in circles now. I'm not going to waste any more of my time on you, sorry.
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  • [06:43:21] <wen> oh,thanks all the same
  • [06:47:23] <CathyInBlue> BeagleCore BCM1. Gnarly.
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  • [06:48:49] <zmatt> the usbarmory is interesting, it's a pity how little IO they pinned out however
  • [06:50:36] <zmatt> and it's way too expensive
  • [06:56:31] <vagrantc> and they're not pushing it to mainline :(
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  • [06:59:24] <zmatt> CathyInBlue: the beaglecore strikes me as bizarrely pointless
  • [06:59:39] <zmatt> if you still need to design a pcb around that thing, you might as well design one around the am335x itself
  • [06:59:57] <snowSTAFF> Hello everyone! General question: how working C code with assembly code? For example, i have a loop in C code, where i change the DATA RAM value.
  • [07:00:44] <CathyInBlue> It might be useful for a high-density, low-power, high-computational throughput cluster system.
  • [07:01:11] * mag__ (~mgreer@8.25.222.2) Quit (Ping timeout: 276 seconds)
  • [07:01:34] <zmatt> doubtful
  • [07:01:51] <zmatt> oh wow its IO also sucks
  • [07:02:02] <vagrantc> there are higher density cores for that
  • [07:03:29] <snowSTAFF> Why i asked: i want to know, assembler code executed for each value in C code or not?
  • [07:03:33] <zmatt> the advertised extensibility implies only one of the two ethernet interfaces is usable (and only at 100 Mbit), only one of the two USB ports, and only one of the three SD/MMC interfaces
  • [07:04:05] * vagrantc (~vagrant@unaffiliated/vagrantc) Quit (Quit: leaving)
  • [07:04:22] <zmatt> and I just ran out of tolerance for their horrible website to suffer browsing it any further
  • [07:05:01] <zmatt> ah wait only one of the two remaining SD/MMC interfaces, there's on-board eMMC
  • [07:05:15] <zmatt> still sucky enough
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  • [07:06:00] <ds2> the am335x isn't that bad of a processing block
  • [07:06:06] <zmatt> especially the fact they apparently failed to make it rgmii capable
  • [07:06:06] <ds2> takes some creativity
  • [07:06:59] <zmatt> ds2: it would not exactly be an obvious choice for a high-throughput parallel computational cluster though
  • [07:07:18] * arianepaola (~ariane@unaffiliated/arianepaola) Quit (Ping timeout: 250 seconds)
  • [07:07:38] <zmatt> sounds more like something you'd use keystones for
  • [07:11:26] <zmatt> more tea.
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  • [11:56:31] <snowstaff> Guys, how worked intterupt, if we use MOV 31.b0 35?
  • [11:56:42] <snowstaff> MOV 31.b0, 35
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  • [12:08:46] <snowstaff> Why 35?
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  • [12:14:34] <KotH> it's half way between 23 and 42
  • [12:17:59] <snowstaff> Is there something like a interrupts table for R31[29:0]?
  • [12:18:36] <snowstaff> i really dont understand, why 35.
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  • [12:24:22] <snowstaff> What is the connection between HOST-2 and 0x00100011 into R1.b0?
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  • [13:14:30] <alex_> hey guys anybody have any idea when the strawson robotics cape or thos beaglebone blue board, whatever they are calling it, is coming out? I have been waiting for like a year plus to get my hands on it after seeing a ti video with it.
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  • [14:15:56] <zmatt> KotH: lol
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  • [14:16:54] <KotH> zmatt: dont tell me you would have answered differently ;)
  • [14:17:45] <zmatt> I could have said RTFM, but snowstaff has been pointed to the TRM often enough already
  • [14:18:22] <zmatt> plus his questions rather frequently look like a word salad
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  • [14:27:20] <yates> it looks like my custom kernel build for a bbb-compatible board is generating a random mac address on every boot. any idea why? i thought it's supposed to take the address from the eFUSE.
  • [14:27:47] <yates> it's an am3352, if that makes a difference.
  • [14:28:47] <yates> i am finding the mac address via "ifconfig"
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  • [14:37:05] <yates> i see a place in u-boot, <u-boot>/net/eth.c, where that is set if eth_getenv_enetaddr_by_index() returns a zero mac address.
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  • [14:47:40] <tfeldmann> Hello, I'm working on a embedded device and I want to display a simple shutdown message like in the old windows days - something like "It's now safe to shut down the device". Do you have any idea how to solve this?
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  • [15:06:54] <tfeldmann> Hello, I'm working on a embedded device and I want to display a simple shutdown message like in the old windows days - something like "It's now safe to shut down the device". Do you have any idea how to solve this?
  • [15:07:29] <tbr> repeating your question frequently decreases your chances for an answer
  • [15:07:35] <tfeldmann> Sorry.
  • [15:08:36] <veremit> graphical or text
  • [15:08:49] <veremit> perhaps you can investigate Plymouth for graphical.
  • [15:08:53] <veremit> <= out
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  • [15:09:56] <tbr> essentially you can throw anything at the framebuffer, just need to make sure you halt and don't power off, etc. plymouth is probably a more orderly way to do that
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  • [15:11:24] <zmatt> yates: weird, but no idea
  • [15:12:05] <tfeldmann> Hm, I'm a beginner with BBB, where would I configure this? I tried following the steps in https://groups.google.com/forum/#!topic/beagleboard/DhMw7cMkimk, but I don't see a splash screen.
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  • [15:12:23] <zmatt> yates: the authoritive source for the MAC address is indeed the control module
  • [15:12:45] <tfeldmann> A simple text would be enough
  • [15:13:25] <zmatt> tfeldmann: assuming X (or any other app writing to the framebuffer) has been killed you can just write a raw 16-bit color image to /dev/fb0
  • [15:15:02] <zmatt> (if the display resolution is fixed and you prefabricate the image it's a simple matter of cat shutdown-image >/dev/fb0 )
  • [15:16:07] <tfeldmann> Ok, sound good! And where would I put the line  cat shutdown-image >/dev/fb0?
  • [15:16:48] <zmatt> ok maybe I should have read what you asked before answering... since showing it after the system has halted is obviously a bit trickier
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  • [15:18:22] <zmatt> the most obvious thing that comes to mind is to make the shutdown procedure 1. terminate all apps and services 2. remount the root fs as readonly 3. sync 4. display the message 5. halt
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  • [15:19:27] <zmatt> that will require some diving into how the shutdown procedure is normally done by systemd
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  • [15:20:13] <zmatt> I know fedora (which is the native home of systemd) actually performs a "reverse pivot" at shutdown, effectively reentering the initramfs environment
  • [15:20:20] <zmatt> that would be a very elegant solution
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  • [15:21:59] <zmatt> but, why do you want this instead of just powering off?
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  • [15:22:30] <zmatt> since actually killing external power is not really completely safe until a genuine poweroff has been done
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  • [15:23:14] <zmatt> since it causes the cpu voltage rails to go down improperly sequenced
  • [15:23:52] <yates> hmm.
  • [15:23:52] <tfeldmann> Ah, ok - I did not know this. I want to do it like that because the BBB is connected to some external hardware, which needs to be shut down prior to powering off the bbb and whole system.
  • [15:24:23] <zmatt> there's no way to make the BBB control the power to that external hardware?
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  • [15:24:57] <tfeldmann> No, they are both connected to the same hardware power switch, which instantly cuts power
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  • [15:25:26] <zmatt> that sounds like asking for trouble indeed
  • [15:26:02] <zmatt> I'm guessing the external hardware is driving signals to the BBB ?
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  • [15:27:24] <zmatt> the easiest solution may be to insert some buffer that's powered from the BBB's 3.3V and tolerant of its inputs being driven while unpowered
  • [15:28:53] <zmatt> or for slow signals use open drain / open collector outputs and pull ups to the BBB's 3.3V
  • [15:30:55] <zmatt> in general making the setup tolerant of independently powering up/down the two units would be my recommendation... trying to power them up/down simultaneously is virtually impossible to achieve in practice and will likely result in undesirable currents flowing during power-up/down that may adversely affect long-term reliability even if it seems to work at first glance
  • [15:32:01] <zmatt> or, if the external unit is tolerant of unannnounced power cut, have its power gated by the BBB
  • [15:32:45] <tfeldmann> Thank you for your help. I think I'm looking into the systemd shutdown routine for the message or just do a regular poweroff and explain it to the users. I'll look into gating the power by the BBB.
  • [15:33:39] <zmatt> note that a poweroff of the BBB is not permitted if the external device is driving a high signal into the BBB
  • [15:34:11] <tfeldmann> It isn't. Just a RS232 connection
  • [15:34:27] <zmatt> "high" as in logic high
  • [15:34:45] <zmatt> which an uart signal (which is presumably what you meant) is by default
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  • [15:35:19] <zmatt> unless you're only using the console port of the BBB, which has an isolation buffer integrated
  • [15:36:06] <zmatt> (actual RS232 involves voltages that would instantly fry the BBB)
  • [15:37:34] <zmatt> in general the voltage on an IO pin may not exceed the IO supply voltage by more than 0.3V-0.5V (check datasheet to be sure), this is true of most ICs
  • [15:37:36] <tfeldmann> Sry, I'm using a UART signal to a Arduino Due, so it's 3V3
  • [15:37:50] <zmatt> when powered down the IO supply voltage is 0V
  • [15:38:08] <zmatt> hence you may not drive a 3.3V signal into the BBB at such time
  • [15:39:13] <zmatt> power domain crossings are a headache :P
  • [15:40:33] <tfeldmann> Ok, good to know! So I have to change that part of the design.
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  • [15:41:10] <zmatt> this isn't really BBB specific though, most likely the arduino due also will not tolerate its inputs being driven while unpowered... although some ICs do allow it (but as explicit featuer)
  • [15:41:15] <zmatt> *feature
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  • [15:43:19] <tfeldmann> Yep, thought so, too. But if they are both connected via uart - which one do I power down first? ;) Or is it enough to simply close the serial connection before powering down the arduino?
  • [15:44:38] <zmatt> one solution would be to arrange for the arduino to go into reset whenever the BBB does
  • [15:44:51] <zmatt> that disables all output drivers
  • [15:45:33] <zmatt> or better yet, kill arduino power when BBB nRESET is asserted, since at that time the BBB isn't driving any outputs either so the arduino may be safely powered off
  • [15:46:05] <zmatt> actually either solution should work equally well I think
  • [15:47:48] <zmatt> if one device is unpowered, the other should be unpowered or in reset
  • [15:48:46] <zmatt> you can of course also manually force pins to be tristated using software, but that's more effort then asserting reset
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  • [15:50:02] <zmatt> if you're lucky, a well-placed schottky diode might do the trick even
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  • [15:51:17] <zmatt> I'm assuming here the arduino has an externally accessible reset pin, active low
  • [15:51:34] <tfeldmann> Currently looking into this… where would you place the diode?
  • [15:51:45] <zmatt> (I don't know anything whatsoever about the arduino due beyond what I quickly glanced from the first google hit)
  • [15:52:12] <zmatt> first maybe check whether the arduino due's cpu tolerates its input being driven while unpowered
  • [15:53:27] <tfeldmann> The Due features this CPU: http://www.atmel.com/Images/Atmel-11057-32-bit-Cortex-M3-Microcontroller-SAM3X-SAM3A_Datasheet.pdf
  • [15:53:59] <zmatt> or well, maybe the reset solution is actually easiest...
  • [15:54:51] <zmatt> that would be from the arduino's nRESET to the BBB's, hence when the BBB nRESET is driven low, the arduino is taken along
  • [15:55:21] <tfeldmann> Yes, sounds good
  • [15:55:31] <zmatt> but in all cases you need to carefully look at what's actually happening at power-up and power-down
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  • [15:57:08] <zmatt> and yes that's annoying, and work, and easy to mess up (the BBB itself also has some minor suboptimalities in that regard)
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  • [15:58:03] <zmatt> ideally everything would be powered from a single big power supply rail, but unfortunately that's often not practical
  • [15:59:11] <zmatt> the BBB itself already has two 3.3V supply rails (with some associated issues, especially in earlier revisions)
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  • [16:04:36] <tfeldmann> Thank you very much for your help. I'm looking into this right now.
  • [16:05:58] <zmatt> good luck
  • [16:06:03] <tfeldmann> Ty!
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  • [16:35:59] <deb___> I have a beagleboard REV c
  • [16:36:03] <deb___> from 2009
  • [16:36:26] <deb___> Can I get all the kernel images
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  • [17:13:50] <twoten> Hi, I have qt creator installed on my BBB - debian Jessie - and when I run an example I get a run time error "failed to open OMAP_MUX: Permission denied"
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  • [17:14:09] <twoten> I don't want to run qt creator as root, but do I have to?
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  • [17:52:46] <d3k0s> Just downloaded the latest debian image for bbg and running it from sdcard, but cannot access via 192.168.7.2, instead theres another ip but thatone doesnt seem to publish the start.html page either (probably due services not being up?)... any ideas or am i missing out a newbie thing here?
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  • [18:03:27] <yates> d3k0s: do you have the usb connected?
  • [18:03:59] <yates> are you powering over usb?
  • [18:04:49] <yates> what happens if you just put x.y.z.w into your browser (instead of x.y.z.w/start.html)?
  • [18:05:45] <d3k0s> yeah, going over usb
  • [18:06:01] <d3k0s> just ip gives connection refused
  • [18:06:36] <yates> are you holding the boot switch down before plugging in the usb?
  • [18:07:10] <d3k0s> i did it first time, got long lights on and when they died i released
  • [18:07:33] <d3k0s> but now, when initiating bbg, im not holding it down no
  • [18:07:41] <d3k0s> seems to boot straight from sdcard
  • [18:07:55] <yates> d3k0s: you need to do it everytime time if you want to ensure it boots from the sdcard
  • [18:07:56] <d3k0s> removing sd, its booting from emmc
  • [18:08:21] <yates> without the boot switch pressed, it FIRST tries to boot from emmc
  • [18:08:28] <yates> with the boot switch pressed, it FIRST tries to boot from sdcard
  • [18:09:05] <d3k0s> okay, does it still matter even if not holding user btn and it seems to boot from sd ?
  • [18:09:19] <yates> how do you know it's booting from sd?
  • [18:09:58] <yates> could be booting from an old image on mmc.
  • [18:10:05] <d3k0s> when bbg is up, im still able to screen into it (am on mac) and im able to access it
  • [18:10:32] <yates> ok, well none of that changes what i have stated to you.
  • [18:11:07] <d3k0s> okay.... am holding userbtn down now
  • [18:11:22] <d3k0s> led1 &2 are blinking intesively
  • [18:11:50] <yates> give it about a minute and see if you can access the web server
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  • [18:13:20] <d3k0s> yeah... ill see now, only led1 is blinking now, the led2 has stopped
  • [18:15:02] <d3k0s> still same
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  • [18:15:19] <d3k0s> 192.168.7.2 gives err-connectio-refused
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  • [18:15:53] <d3k0s> tho screening to it gives Debian GNU/Linux 8 beaglebone ttyGS0 BeagleBoard.org Debian Image 2016-01-24 Support/FAQ: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian default username:password is [debian:temppwd] The IP Address for usb0 is: 192.168.7.2 beaglebone login: debian
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  • [18:17:14] <d3k0s> apache2 is up but seems to be confed towards /var/www and network/interfaces seems to be setting up 192....7.2
  • [18:21:44] <d3k0s> this is network setting on osx http://d.pr/i/1cGRm
  • [18:21:56] <d3k0s> seems to conf another ip, still unreacable
  • [18:22:20] <d3k0s> added test index.html in /var/www/html but cant reach it either
  • [18:26:13] <d3k0s> c9 is unreachable as well :/
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  • [21:05:26] <yates> d3k0s: i'm confused. it looks like everything is fine to me if you can get a prompt.
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  • [22:13:33] <Ownasaurus> hello beagle community, my /sys/class/uio is empty, but on an old OS i was able to access uio0 to read the address of the PRU shared memory, etc. i was hoping somebody could help me regain this functionality. i am happy to provide any information needed
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  • [22:44:49] <Ownasaurus> Hello, is anybody available there to assist with a beaglebone black PRU issue?
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  • [23:12:30] <ds2> zmatt: yes, keystone has better raw processing power but depending on how your model it, the Am33's aren't too far. I am thinking of all the resources such as the GPU.
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  • [23:58:10] <dbroin_> Hi everyone! I am trying to build a linux image with buildroot. I have some problems to get a LCD working. I am using a Chipsee LCD. Could you tell me something about needed drivers, kernel patches, place to look for some information? I am kind of lost :(