Hi Mikkel, I am trying to follow Andrew's post as close as I can. The tree I am building from is git://git.denx.de/u-boot.git, the one provided in Andrew's post.
RESOLVED: > > Upon investigating the u-boot output we found we were facing the same > problem reported earlier in this thread by duckhunter: u-boot was detecting > spurious data on uart0 and entering the u-boot console on about 1/20 > power-ups. > > Rather than making any hardware mods I decided to reconfigured u-boot to > look for a specific key sequence before entering the u-boot console. To do > this I firstly downloaded and rebuilt u-boot following instructions here: > http://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-Bootloader:U-Boot. > > (Testing with the default config produced the same 'failure' rate) > I then modified '/include/config.h' in the u-boot source files, adding the > following: > > #define CONFIG_AUTOBOOT_KEYED 1 > #define CONFIG_AUTOBOOT_DELAY_STR "uboot" > > This now forces a user to enter the string 'uboot' before entering the > u-boot console, otherwise the device will boot up normally. > > Rebuilding with this configuration still gave the same failure rate > however. This is when I learned that the boot files on the eMMC flash are > still loading before jumping to the files on the sd card I am using. So > upon deleting the MLO file on the eMMC flash I had more luck. > > We setup a programmable power supply and a script looking at the output of > uart0 to detect whether the device had successfully booted or had become > stuck in u-boot, and then left it cycling power. We were then able to get > many hundreds of consecutive successful boots - we only stopped the test > because we decided it would probably never fail. > > So in the end it all came down to spurious data on uart0 - along with > disabling booting from the eMMC. (we could have simply reconfigured u-boot > on the eMMC in the same way, but disabling it drops a few seconds off the > boot time). > > > Thanks for all your help Gerald (and duckhunter). > > Regards, > Andrew Glen. > -- 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.
