We are dealing with the same issue - we found another complaint of the same thing, in which the user identifies phantom characters on the UART during startup causing the board to go into u-boot. If you don't have a display attached or a serial connection available, u-boot looks a lot like a solid power LED and nothing else. link to that thread: http://andicelabs.com/2014/07/beaglebone-black-boot-issues/
That user apparently was able to modify u-boot to look for a certain character instead of any keystroke. In the limiting testing I've done, it seems that the problem also doesn't occur if you have a serial connection hooked up to UART0. I'm now experimenting with jumping the RX line of UART0 to 3.3v, and so far haven't had the issue again. On Wednesday, June 3, 2015 at 6:27:26 AM UTC-7, [email protected] wrote: > > Hi guys, > > I am facing the same problem (power LED on, user LED off and board not > booting). > > It only happens occasionally. I wrote a script that reboots the board > every 60s (using "shutdown -r now") to reproduce. > > I then installed the "MLO" and "u-boot.img" files that are available in " > https://www.dropbox.com/sh/98xacnk466xfpza/uTlii1hrsg"; but the problem > still happens occasionally. > > I am not sure though I installed "MLO" and "u-boot.img" correctly - > exactly which folder do these files have to be copied into? > I found existing "MLO" and "u-boot.img"files in "/opt/backup/uboot" so I > copied the new files to that location. Or do I have to copy them to > "/boot/uboot" instead? > > Sorry if this seems to be a silly question - I am still quite new to the > BBB and have been struggling with several issues. This issue is one of > them; eth0 occasionally not connecting after reboot if static IP settings > is another one (but that will be a separate post). > > Thanks for all help; I am a bit in a desperate situation as my system > (based on BBB) will be installed in an unattended environment where power > failures are possible - so it is crucial that the boot rate is 100.00%! > > Regards > Ivan > -- 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/d/optout.
