> > *I have been building embedded systems for a while now and I am > considering using the beaglebone (BBB) for an upcoming project, but I am > confused by everything I read regarding the shutdown requirements. As an > embedded system the only way to turn it off is to simply shutdown the power > with a switch, yet my preliminary research indicates that this is a no-no > as it may damage the BBB and/or corrupt the file system. I also read a lot > of comments regarding voltage on the pins after a shutdown; in my case, > very likely there will be a CAT5 cable with live activity connected even > after power down; assume the magnetics should protect the BBB, but just > checking.* >
This is true of any system running an OS that is not red only. If you unceremoniously yank the power, you're asking for trouble. *I have used quite a few micro controllers and various self-standing > systems, but am fairly new to the BBB - still mostly reading about it. Am > I missing something? How can a device meant to be used in embedded systems > not be tolerant of power loss and be so finicky about power?* > It sounds like you're missing a lot. It sounds like you've had a lot of experience with small micros, that run bare metal, but have have no, or limited experience with using an embedded OS. Then if you stop and think of the cost of this board, and what the goal of beagleboard.org was when the board was created. Perhaps then it become clear as to how / why we're where we are in this context. You can fix all of this yourself, using external hardware, and custom software. > > *By the way, I can see there is a battery backup circuit but I do not want > to use a lithium battery for safety/temperature/cost reasons. Using a > large capacitor also seems tricky as the shutdown may take a few seconds so > I don't see how that will work.* > > *Any suggestions would be greatly appreciated.* Use a super capacitor. On Mon, May 2, 2016 at 8:39 AM, Gerald Coley <ger...@beagleboard.org> wrote: > > > On Mon, May 2, 2016 at 10:36 AM, Yiannis Papelis <ypape...@gmail.com> > wrote: > >> I have been building embedded systems for a while now and I am >> considering using the beaglebone (BBB) for an upcoming project, but I am >> confused by everything I read regarding the shutdown requirements. As an >> embedded system the only way to turn it off is to simply shutdown the power >> with a switch, yet my preliminary research indicates that this is a no-no >> as it may damage the BBB and/or corrupt the file system. I also read a lot >> of comments regarding voltage on the pins after a shutdown; in my case, >> very likely there will be a CAT5 cable with live activity connected even >> after power down; assume the magnetics should protect the BBB, but just >> checking. >> >> I have used quite a few micro controllers and various self-standing >> systems, but am fairly new to the BBB - still mostly reading about it. Am >> I missing something? How can a device meant to be used in embedded systems >> not be tolerant of power loss and be so finicky about power? >> >> By the way, I can see there is a battery backup circuit but I do not want >> to use a lithium battery for safety/temperature/cost reasons. Using a >> large capacitor also seems tricky as the shutdown may take a few seconds so >> I don't see how that will work. >> >> Any suggestions would be greatly appreciated. >> >> -- >> 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/4b2dc307-631d-405d-88d6-7537adb3ac29%40googlegroups.com >> <https://groups.google.com/d/msgid/beagleboard/4b2dc307-631d-405d-88d6-7537adb3ac29%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > > Main reason for the shutdown process is the corruption of the Linux file > system. > > If you have power on any signal when the processor is shutdown, then you > are asking for trouble. > > > http://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pin_Usage > > > Gerald > > ger...@beagleboard.org > http://beagleboard.org/ > gcol...@emprodesign.com > > -- > 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/CAHK_S%2BergZ8%2BPd5zBdxsHqJDzQphgPXKXF0oayzjV1PVHPY8kw%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CAHK_S%2BergZ8%2BPd5zBdxsHqJDzQphgPXKXF0oayzjV1PVHPY8kw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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/CALHSORr%3DrehLFgTf6Ye6fT9FwurEiCeuL%2B0EXY6Vj6Myzr%3DQEw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
