I have soldered a 15 ohm power resistor between SYS_5V (P9.8) and DGND (P9.2). This increases SYS_5V load by 333mA. After three days of test I can confirm that random reboot frequency have not changed so it seems that the current load is not the problem.
BTW: I have found and unexpected TPS65217C behavior related to the USB power detection. I have posted this issue at http://e2e.ti.com/support/arm/sitara_arm/f/791/t/305879.aspx Best regards. El jueves, 21 de noviembre de 2013 20:52:39 UTC+1, lisarden escribió: > > I don't think that connecting a USB cable reduces the current load to the > PMIC because there are two different switches in the power path for the AC > and USB inputs. They can't be opened at the same time because the PMIC > can't be sure that two sources have the same voltage. If both switches are > opened then current can flow backwards to a weaker source IMHO. Probably > it's really a ground issue as Gerald said before > > > 2013/11/21 Maxim Podbereznyy <lisa...@gmail.com <javascript:>> > >> I doubt the issue is connected with the floating nRESET pin. If you have >> a look at the "Figure 1. Global State Diagram" at page 16 the PMIC always >> waits for 1 second after a *FAULT*. Please read the following: >> >> FAULT = UVLO || OTS || PGOOD low|| PWR_EN pin not asserted within 5s of >> Wakeup event. >> If no battery is present, OVP on AC input also leads to OFF mode. With >> battery present, device switches >> automatically from AC to BAT if AC is>6.5V and back to AC when voltage >> recovers to<6.5V. >> Device will remain in RESET state for at least 1s. >> >> UVLO = Under Voltage Lockout >> OTS = Over Temperature Shutdown >> OVP = Over Voltage Protection >> >> >> 2013/11/21 Lei Wang <lei...@gmail.com <javascript:>> >> >>> Thanks for sharing the captured trace. It is very helpful. I wonder if >>> you could further zoom in on the falling edge. I am really interested in >>> the order of SYS_5V voltage drop and SYS_RESETn voltage drop. >>> >>> Also I noticed in TPS65217 datasheet, if the nRESET pin is pulled low, >>> there will be a minimum 1s delay before the PMIC returns to Active state >>> (page 15). The nRESET pin is not connected on BBB. It should have an >>> internal pull-up resistor of 100k (supposed to an alway-on supply). TI's >>> engineer may have better insight on this. >>> >>> I did some measurement on the current consumptions of different Kernels >>> (showing below). As you can tell 3.8 Kernels do draw less current. >>> >>> *image* >>> >>> Angstrom (3.8 kernel) >>> >>> Android(3.8 kernel) >>> >>> Android(3.2 kernel) >>> >>> *clock (Hz)* >>> >>> 1G >>> >>> 1G >>> >>> 1G >>> >>> *Display type* >>> >>> HDMI >>> >>> HDMI >>> >>> HDMI >>> >>> *current (mA)* >>> >>> 290 >>> >>> 300 >>> >>> 375 >>> >>> >>> >>> >>> On Thursday, November 21, 2013 7:53:20 AM UTC-5, Antonio Cebrián wrote: >>> >>>> I have captured a BBB A5B random reboot with the oscilloscope (see >>>> attached image). >>>> >>>> Ch1 → VDD_3V3B (P9.4) >>>> Ch2 → VDD_5V (P9.6) >>>> Ch3 → SYS_5V (P9.8) >>>> Ch4 → SYS_RESETn (P9.10) >>>> >>>> This confirms that the random reboot is produced by 1 second SYS_5V >>>> fall. >>>> >>>> Best regards. >>>> >>>> >>>> >>>> 2013/11/20 <ance...@gmail.com> >>>> >>>> After reading the Jakub thread the new conclusion is that this seems to >>>>> bee a hardware related problem (related to PMIC). This may explain why >>>>> changing kernel or changing CPU frequency doesn't resolve the problem >>>>> (only >>>>> minimizes it). >>>>> >>>>> I will test the Jakub hardware workaround (external MOSFET) in my own >>>>> system. >>>>> >>>>> About your questions: >>>>> >>>>> - I'm using a BBB A5B with a custom cape that includes: a LVDS >>>>> converter for a LCD, a resistive touchscreen, a MAX3232 converter for a >>>>> RS232 port and a buffer for some push buttons. >>>>> >>>>> - I have recompiled the TI 3.2 kernel (from LINUXEZSDK-BONE v06.00) to >>>>> include the proper LCD initialization. >>>>> >>>>> - The system runs a Qt application with CPU load below 10%. The CPU >>>>> works all time at default 1 GHz frequency. >>>>> >>>>> - I have two identical systems under test and I got one reboot each 2 >>>>> to 3 hours but some days both systems work without reboots for 10 to 15 >>>>> hours. >>>>> >>>>> >>>>> Best regards. >>>>> >>>>> >>>>> El miércoles, 20 de noviembre de 2013 19:33:26 UTC+1, Lei Wang >>>>> escribió: >>>>> >>>>>> It seems that Angstrom 3.8 kernel is more robust. But I couldn't >>>>>> confirm that it will resolve the random reboot issue. I haven't done >>>>>> long >>>>>> term testing. I remember seeing someone also has problem with it. It >>>>>> could >>>>>> be just that kernel is more optimized which draws less current. >>>>>> >>>>>> Limiting the CPU frequency only made BBB random reboot less often. I >>>>>> can confirm that. I believe it is also related to the current draw. The >>>>>> slower the clock the less the power is drawn from PMIC. >>>>>> >>>>>> By plugging in both DC power and USB cable (mini connector), it >>>>>> increases the PMIC current capacity. PMIC has two power paths (AC->SYS >>>>>> and >>>>>> USB->SYS), which reduces the stress placed on a single path (AC->SYS). I >>>>>> am >>>>>> suspecting the PMIC thermal shutdown causes the random reboot. Please >>>>>> take >>>>>> a look at the other thread I mentioned in a previous post. Jakub >>>>>> suggested >>>>>> putting in a Mosfet to bypass VDD_5V to SYS_5V path after boot up. >>>>>> >>>>>> BTW, could you tell me what is your setup besides using TI prebuild >>>>>> kernel? Are you driving a HDMI display or a LCD cape? what else do you >>>>>> connect to the BBB? >>>>>> >>>>>> Thanks, >>>>>> >>>>>> Lei >>>>>> >>>>>> >>>>>> On Wednesday, November 20, 2013 12:28:36 PM UTC-5, >>>>>> ance...@gmail.comwrote: >>>>>>> >>>>>>> I confirm that I have the same issue with a BBB A5B using TI 3.2 >>>>>>> kernel. >>>>>>> >>>>>>> After reading the full thread I guess that the posible workarounds >>>>>>> are: >>>>>>> >>>>>>> - Using Angstrom 3.8 kernel. >>>>>>> - Powering the BBB from USB. >>>>>>> - Limiting the CPU frequency. >>>>>>> >>>>>>> Can anybody confirm it? >>>>>>> >>>>>>> Best regards. >>>>>>> >>>>>>> >>>>>>> El martes, 12 de noviembre de 2013 15:37:07 UTC+1, Lei Wang escribió: >>>>>>>> >>>>>>>> I have similar issue. I have (2) versions of BBB (A5A and A5C). >>>>>>>> They both randomly reboot themselves while I am running TI prebuilt >>>>>>>> BBB >>>>>>>> android image (from a couple hours to ten to fifteen hours). When I >>>>>>>> plug in >>>>>>>> the USB (DC is still powered) for logging with logcat, the reboot >>>>>>>> issue >>>>>>>> seems to disappear. >>>>>>>> >>>>>>>> I don't have problem with BBB Angstrom image (based on 3.8 kernel). >>>>>>>> I don't have problem with Andrew Henderson's android image (based on >>>>>>>> 3.8 >>>>>>>> kernel) either. >>>>>>>> >>>>>>>> Another issue is that when I run TI BBB android image, the clock >>>>>>>> randomly jumps forward 2^17 seconds. This happens on both of my BBB >>>>>>>> boards. >>>>>>>> The problem goes away when I run Angstrom or Andrew's android. >>>>>>>> >>>>>>>> I suspect it has something to do with the processor, DDR3 (BBB: >>>>>>>> AM3359 1GHz + 512MB DDR3), the configuration, or apply workaround of >>>>>>>> errata. We have an AM335x EVM kit (AM3359 720MHz + 256MB DDR2). I also >>>>>>>> loaded TI prebuilt android image. I have run it for several months. It >>>>>>>> is >>>>>>>> rock solid. I never had problem with it. >>>>>>>> >>>>>>>> Here are the links to my other posts in regarding to this issue. >>>>>>>> https://groups.google.com/forum/#!category-topic/beagleboard >>>>>>>> /advanced/5qSJ4dQdar4 >>>>>>>> http://e2e.ti.com/support/embedded/android/f/509/t/297726.aspx<http://www.google.com/url?q=http%3A%2F%2Fe2e.ti.com%2Fsupport%2Fembedded%2Fandroid%2Ff%2F509%2Ft%2F297726.aspx&sa=D&sntz=1&usg=AFQjCNFNp-bsLCgqLguXpYlSGbA7sSnOaQ> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Thursday, October 31, 2013 6:32:16 PM UTC-4, Illutian Kade wrote: >>>>>>>>> >>>>>>>>> And now the board won't power on from the Debug Port, but will >>>>>>>>> form the DC jack. At this point I'm about to say "fuck this shit". >>>>>>>>> >>>>>>>>> On Saturday, October 5, 2013 7:12:06 AM UTC-4, Illutian Kade wrote: >>>>>>>>>> >>>>>>>>>> Has anyone experienced their BBB rebooting at random? >>>>>>>>>> >>>>>>>>>> It was running solid for two days straight and this morning it >>>>>>>>>> just keeps rebooting. This last time the power light even went out. >>>>>>>>>> >>>>>>>>>> *I've checked and all cables are secured. The entire setup is >>>>>>>>>> running of a PFC UPS; so power fluctuations shouldn't be an issue. >>>>>>>>>> >>>>>>>>>> *CPU doesn't seem to be under load; ~20% utilization >>>>>>>>>> >>>>>>>>>> *I've done a total unplug-let-sit and restart >>>>>>>>>> >>>>>>>>>> *From what logs I've looked through (message and kern.log) the >>>>>>>>>> board does a total restart and loses even the date (goes form Oct 5 >>>>>>>>>> to Aug >>>>>>>>>> 26) >>>>>>>>>> >>>>>>>>>> *I've not made any changes other than unplugging the Syba C-media >>>>>>>>>> USB sound card and transferring it back to my main computer after I >>>>>>>>>> wake up >>>>>>>>>> (BBB is doubling as a media player) >>>>>>>>>> -This has worked for a grand total of 'uptime' 2 days and some >>>>>>>>>> odd hours with no issues. >>>>>>>>>> >>>>>>>>>> ..I really hope this doesn't mean the board is defective :\ >>>>>>>>>> >>>>>>>>>> OS: Debian Wheezy (BBB-eMMC-flasher-debian-7.1-2013-08-26.img) >>>>>>>>>> Power: AC Adapter >>>>>>>>>> (http://www.adafruit.com/products/276<http://www.google.com/url?q=http%3A%2F%2Fwww.adafruit.com%2Fproducts%2F276&sa=D&sntz=1&usg=AFQjCNEvq3gmvP89fzs-F5q-Np8TKs0UdA>) >>>>>>>>>> >>>>>>>>>> [specifically recommended by Adafruit] >>>>>>>>>> >>>>>>>>> >>>> -- >>> 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...@googlegroups.com <javascript:>. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> >> >> -- >> LinkedIn - http://www.linkedin.com/in/maximpodbereznyy >> Company - http://www.linkedin.com/company/mentorel >> Facebook - https://www.facebook.com/mentorel.company >> > > > > -- > LinkedIn - http://www.linkedin.com/in/maximpodbereznyy > Company - http://www.linkedin.com/company/mentorel > Facebook - https://www.facebook.com/mentorel.company > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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