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, [email protected]: >> >> 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 >>> >>> >>> >>> 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) >>>>> [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. 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