Hello All, I am also having this problem - with a bench top power supply set to 5V and 5A, plugging into the barrel connector with no SD card inserted, so running the default Angstrom image from flash, the device will fail to boot at least 1 in 20 tries. A similar failure rate was observed on my two other boards.
I noticed a new board revision has been a released - the A6. The list of revisions included a reference to fixing a random glitch in the SYS_RESETn signal. Could this possibly address the problem I have been seeing - I would be more than happy to buy more boards if this is the case. Regardless of the new release, I have tried various experiments to find a 100% reliable way of making the A5C board boot, as follows: 1) Hold reset button, connect power, release reset button after ~1 second. 2) Connect power, press and hold reset button, then release after ~1 second. 3) Hold Power button, connect power, wait till power led goes off, then release power button. All of these also failed at varying rates, but all showing at least one failure out of 40 tries - which is unfortunate as I am building a custom cape that will have access to the reset and power signals, so I there was some sure fire way of making it boot this would have been fairly easy to include in my design. Any further info would be greatly appreciated. Regards, Andrew. On Saturday, 28 September 2013 10:04:06 UTC+12, [email protected] wrote: > > Same problem here, its showing up in 2 ways. The Beagle Board Black has a > power control IC that is sensitive to 5 volt rise time and has frozen up > under short brownout situations..in fact, I can freeze it up at will by > dropping out 5 V for about 100mS, it will lock up with 3.3 volts turned off > even though the 5 volt input is good. Removing the 5 volt input for more > than 1 second restores normal 3.3 Volt power and all is good. The other > way..I'm still investigating, it refuses to boot about 1 in 20 tries for > reasons that are so far unknown. In this instance I have power supply > monitoring instruments all over this board, and the power supply controller > is working even when the lockup occurs. So I'm mainly interested in the > situation where the blue lights are on but the board is not booting. We are > running a port of Debian Linux. > > > On Wednesday, July 31, 2013 5:48:54 PM UTC-4, [email protected] wrote: >> >> Hi guys, >> >> we have a problem with our Beagle Bone Black (A5C). We are using Ubuntu >> Raring 13.04 armhf v3.8.13-bone21 (2013-06-14) on the eMMC (no SD Card). >> The Beagle Bone is placed in a case and we have connected it to a DC power >> supply. Sometimes (I would say every 5 to 10 times), when we are plugging >> in our power supply, the BeagleBone powers on (Power LED is on), but >> nothing more happens (none of the other four LEDs is on). If we are now >> removing the power supply and putting it in again, the BBB starts normally. >> I guess the power supply is strong enough: 5A@5V. >> >> Thanks for your help in advance. >> >> Regards, >> duckhunter >> > -- 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 [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
