I was also driven crazy by the issue initially, but after fixing it I have seen zero issues relating to the boot sequence getting stuck.
The problem my solution refers to is noise on the uart causing u-boot to enter its terminal. Like when you boot up a PC and press F12 (or some other key) to enter the bios menu, u-boot looks for any input on the uart to break out of the boot sequence and enter the 'u-boot menu'. The fix involves two steps. Firstly, u-boot can be recompiled to look for a specific character sequence (instead of any input) before entering the u-boot terminal. The files Guillermo linked to are for this effect. This solves the problem of random noise causing the boot sequence to stop at u-boot, unless some miracle the random noise spells out your specific character sequence, which I for one am happy to allow for as a possible corner case. Secondly, the boot sequence of the processor looks at the eMMC first for an MLO file to boot with. So by deleting the MLO file on the eMMC you stop the processor trying to boot from there. By simply copying the same boot files to the eMMC you'll also solve the problem, I just thought it better to have nothing there. Regards, Andrew. On 6 May 2014 02:47, <t...@maaiveld.nl> wrote: > Hi, > > Thanks a lot to all of you guys for this effort... > > I have been stuck for weeks with 50+ beagle's that wouldn't reboot (or > startup) 1/10 times... > It is driving me crazy... > > Do I really assume correctly that all that is needed to fix this is replace > the two files? > No flashing or otherwise "enabling" the changes? > > I'm testing with one of them now and sofar it's coming back every time, but > I have no idea how to really check if the changes did "stick" > (they're all in a remote location) > > Thanks, Tony > > > On Wednesday, April 23, 2014 5:36:11 PM UTC+2, gagu...@stratia.net wrote: >> >> Hello, >> Basing on the correct answer of Andrew Glen,I attach the link of the >> compiled files to avoid the boot problem, you just need to replace the >> original files "MLO" and "u-boot.img" on eMMC and SD card, sorry for my bad >> english, regards: >> >> https://www.dropbox.com/sh/98xacnk466xfpza/uTlii1hrsg >> >> El miércoles, 31 de julio de 2013 16:48:54 UTC-5, duckhunt...@gmail.com >> escribió: >>> >>> 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 a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/aXv6An1xfqI/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > beagleboard+unsubscr...@googlegroups.com. > 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. For more options, visit https://groups.google.com/d/optout.
