Re: [beagleboard] RE: [EXTERNAL] Re: Industrial Beagle Bone Black damages SD cards.
On 4/9/19 7:59 AM, Steffensen, Flemming [COMRES/SOL/AAR] wrote: The failing SD-cards are for the most part the consumer SanDisk Ultra A1 SDHC 16gb, but we also have a few Kingston industrial 8gb (SDCIT/8GB B0623-004.A00LFTS). They are bought through official distributors of the respective brands, and not likely to be fake, although we have not performed tests anywhere near as detailed as the one you link to. Talking with the distributer, I’m told that they internally have 0.08 % failure rate on the consumer SanDisk, and less than 0.00 % of the industrial Kingston. The datasheet for either card makes no promise in this regard, except 5 and 10 year warranty. I’ve asked for further details, if possible. I had the same problems until switching to SwissBit SLC SD cards, which are supposed to have aggressive power-up/power-down protection circuits. No problems since. Very expensive, but cheaper than in-field failures. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/1868d7f9-5cb8-385b-49a6-6100fe8c73bc%40avtechpulse.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Power - shutdown
On 05/02/2016 02:54 PM, Yiannis Papelis wrote: Very much agree with you - even though I don't want to use a battery, it seems more and more than a battery is a necessity for field use of the BBB, which would explain the existing connector. In my work, the solution was to use a read-only filesystem with a tmpfs overlay. I mount the boot and root partitions read-only, and configure /etc/sysconfig/readonly-root with READONLY=yes and TEMPORARY_STATE=yes. (This system runs Fedora.) Permanent file writes are not frequently needed, but the filesystems can be temporarily re-mounted as read/write when they are required. Also, I use a Swissbit SD card, which is more robust (and expensive) than normal SD cards, because it contains additional power-down protection. I haven't experienced any filesystem corruption since switching to this approach. I did use supercaps as pseudo-battery-backups for a while - the program would switch the filesystem to readonly as soon as a powerfail circuit was tripped - but the readonly+overlay approach is simpler and more robust in practice. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/577c2f3b-dc9c-184f-8e04-088aa602144e%40avtechpulse.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBone Black doesn't sometimes start. Only Power LED is on
On 08/13/2015 07:28 PM, Andrew Glen wrote: For what it's worth, I run hundreds of 24/7 unattended systems with the BBB. We have tested reboots into the tens of thousands, and with some work we are able to achieve zero failures. Off the top of my head here are the key platform specific things I do that you might want to look at: 1) Mod the h/w to avoid the Ethernet issue (from another post) (this may be fixed in the latest kernel, but we locked the s/w down a while back. Andrew, Could you elaborate on what hardware changes you made to fix the ethernet issue? - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: BBB power led blinking, revived after several power button presses
http://beagleboard.org/getting-started. I was happy to see, the programs on the website worked just fine on my board. Thus, I was able to conclude that strangely, my BBB board didn't like 5V external power source! The BeagleBone Black BlueSteel Basic seem to be extremely sensitive to the rise time of the 5V power supply at startup. 1 ms or longer is a problem, and it is not at all unusual for power supply to be slower than this. 200 us is reliable. See also: https://groups.google.com/forum/#!msg/beagleboard/aXv6An1xfqI/Vy9JxPRvIPwJ The original BeagleBone White, for whatever reason, did not have this issue. (Anyone know why?) I feed my raw power in through a voltage-controlled solid state relay circuit, and I get 100% reliable startups now. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Recommendation to boot / resume Linux in less than a second...
On 11/11/2014 09:19 AM, Jean-Pierre Poulin wrote: Hi all, many thanks for this insightful discussion. Q: Is systemd a viable option to optimize boot-time on ARM embedded platforms? (Given its steeper learning curve are the results worth the extra work / risk over 'init'?) I've attached the output of systemd-analyze plot plot.svg on my BBB system for your reference. My systems need to boot in 10 seconds or less, and that is easily achieved. There is really no reason not to use systemd, that I am aware of. (There is a lot of FUD about it, though.) - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Recommendation to boot / resume Linux in less than a second...
On 11/10/2014 03:37 PM, William Hermans wrote: systemd is supposed to make boot times even faster compared to the older / std debian init daemon. The problem I personally have with systemd, is that I'm oldschool Linux, know init fairly well, and can not find very good information about systemd on the web. systemd has a ton of documentation. Some useful bits: http://0pointer.de/blog/projects/blame-game.html http://www.freedesktop.org/wiki/Software/systemd/TipsAndTricks/ http://www.freedesktop.org/wiki/Software/systemd/ Using systemd-analyze plot plot.svg is hugely useful for identifying startup bottlenecks. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] BlueSteel-Basic gone?
Has the BlueSteel-Basic been discontinued? - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Why use C/C++ file I/O to access GPIO pins?
I've been playing with software and hardware for 30+ years, but I'm new to Linux and embedded Linux systems. The code snippets I've been able to find for GPIO access all seem use file I/O functions. I've never seen this approach before -- I'm accustomed to reading and writing processor registers. The file I/O approach seems strange to me, but I'm new here, and there's a /lot /that seems strange. You may be more comfortable using the GPMC bus for memory-mapped byte I/O, rather than the bit-wise GPIO interface. It's much faster too. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] gpio high on startup
On 08/07/2014 01:16 AM, Matt Pinner wrote: are the gpio pins always high during boot? See pages 17-49 of http://www.ti.com/lit/ds/symlink/am3359.pdf for the default states of each pin. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Maximum current on GPIO?
Now when I want to set a HIGH signal to that GPI, can I connect it with BBBs 3.3V directly Yes. or is a resistor needed in order to keep this 8 mA sink limit? No. (You must observe the 8 mA limit, but connecting a GPIO to the 3.3V or gnd rails will not require anything close to 8 mA.) -Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBoard SBC Goes OEM, COM Version Coming
On 06/18/2014 02:10 AM, Maxim Podbereznyy wrote: So from the article The BlueSteel-Basic is available for pre-order now at $55 and the full version is $55 at Digikey. What's the point? :) Well, the full version is only hypothetically available at DigiKey. The commercial board may allow CircuitCo to make a profit, and act as a incentive keep them in stock, which would be nice. Moreover does removing a couple of chips make this board industrial friendly? Less power is a win. Less complexity is a win. Possibly greater availability due to fewer exotic parts is a win. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] GPIO2_7, etc. (boot conflict?)
On 06/16/2014 07:49 PM, Lee Crocker wrote: find 6 other GPIOs if I don't have to, so is there some simpler way of making these not interfere with the boot process? I use a 3-state buffer driven by SYS_RESETn. The buffer is open during reset. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Can the BBB get damaged due to a hard power down?
I really donšt see how this can work. First, the supercaps are 2.5v so you No: http://www.digikey.com/product-detail/en/PHB-5R0V505-R/283-3520-ND/2770536 PMC wonšt like a short circuit, which the supercap is when it is fully discharged. I could go on, but this idea doesnšt make sense to me. Same is true of an uncharged battery. The charger circuit is current-limited. (I pull it up with a diode drop + 10 Ohms to a +5V rail also, for faster charging.) - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Can the BBB get damaged due to a hard power down?
Sounds cool and easy to implement hardware-wise. Can you share the code for that? Something like this: // use plain old open to avoid any buffering etc int enablefd = open(/proc/sys/kernel/sysrq, O_SYNC | O_RDWR); int trgfd = open(/proc/sysrq-trigger, O_SYNC | O_RDWR); // enable sysrq write(enablefd, 1\n, 2); close(enablefd); // sync disks write(trgfd, s\n, 2); // remount ro write(trgfd, u\n, 2); close(trgfd); // poweroff system (/usr/bin/systemctl poweroff -f); exit(0); As I mentioned, I use full data+metadata journaling on the filesystem, not just metadata. The only issue is that the system doesn't restart if power is reapplied before the supercap is fully discharged. You have to wait 10 seconds or so before a restart is possible. I'm not sure how to fix that. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Can the BBB get damaged due to a hard power down?
asked anyone at TI if it is OK to use the PMU like this? Perhaps you should post a question on E2E. From http://e2e.ti.com/support/power_management/pmu/f/200/t/185514.aspx: The battery charger should work fine with a supercap. You'll need to make sure the TS (battery temp sense) pin is at a proper voltage to allow charging. If the supercap does not have a temperature sensor, you can simply put a 10k resistor from TS to GND. If you are charging at 440mA, it will take 50 Seconds to reach full charge. What happens when the power fails before that 50 Seconds? I would recommend that you monitor the supercap voltage and wait until it is fully charged before opening any files. That is why I use full data+metadata journaling on the filesystem. If an unclean shutdown happens before the supercap is charged, the next boot-up will be delayed for several seconds as the filesystem is repaired using the full journal. That is annoying, but it is a minor cost for robustness. Mostly, the supercap is there to eliminate the need for the repair delay. It is an interesting concept, but I'm still skeptical if this can really work. Well, I do use it, so that's one data point. The other main alternative for bullet-proof power-fail robustness is to rely on on something like unionfs to provide a mix of read-only and read/write filesystems, but that's not so simple either. It's complex and not very well supported in general. Batteries have a fairly limited lifetime, so I don't consider that a practical solution (for me). I'm interested to hear how other people prevent corruption on power loss, though. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Can the BBB get damaged due to a hard power down?
On 05/28/2014 02:19 PM, William Hermans wrote: Batteries can be had that have a lifetime of 5+ years. Depending on the type of battery you use. Flooded lead acid ( for RE use ) can have a much longer life. Especially if the batteries are conditioned / charged properly. No doubt, but if I can avoid putting a battery in my product, I will. They will die eventually, they sometimes corrode in a horrible mess, and they require maintenance actions by the user. No thanks. :-) - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Can the BBB get damaged due to a hard power down?
A battery powered cape for a graceful power-down might be option. I don't have the knowledge to design/build one (relatively) easily. On the BeagleBone white, I use a 5F supercap on the battery terminals. When my hardware detects failing prime power it flags an input that my software watches for. My software then immediately uses the magic-sysrq to sync disks and remount as read-only, to protect the filesystem. The supercap provides just enough power/time to do that. Also, I use full data+metadata journaling on the filesystem (ext4). It's been very robust so far. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Commercial use of BeagleBone
On 05/22/2014 09:18 AM, Gerald Coley wrote: You can build it yourself. The white label program at CCO has been suspended until they get their production capacity increased. Ugh. Do you have any more information on that? Circuitco is totally unresponsive about the status of our various orders. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Commercial use of BeagleBone
On 05/22/2014 11:18 AM, Gerald Coley wrote: Michael, Did you get a response from CCO? Yes. Thank you! - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Availability - how come nobody has any BeagleBone Black to sell?
On 04/03/2014 05:26 AM, Drew Fustini wrote: For North America, the Embest BBone Black appears to be in stock for $45USD with qty 768: http://www.newark.com/element14/bbone-black/dev-board-am3358-mpu/dp/41X3868?ost=bbone+black+embest Is anyone selling an original BeagleBone (white, not black) equivalent? I have an order in with CircuitCo, but it is weeks overdue and they are not returning emails or phone calls. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: Availability - how come nobody has any BeagleBone Black to sell?
On 04/03/2014 09:11 AM, Anil Gupta wrote: As far as I know, Circuitco only takes orders from qualified distributors. Unless you are one, they won't entertain your order. No, that's not correct. They take orders from anyone who wants to use the boards commercially. Ordering from distributors for commercial purposes is frowned upon in the BB community, for obscure reasons. They have my order; they just aren't delivering in the promised timeframe. - Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
