So it ended up being ridiculously easy- thank you for all your work, Robert!
I just switched the two if statements in the CONFIG_BOOTCOMMAND definition in am335x_evm.h (u-boot/include/configs) so that mmc dev 1 was attempted first. Now I have this u-boot.img on my eMMC and the original on the SD card. Now I can leave the SD card in there and only boot from it when I hold down S2 :) Best, Louis On Sunday, March 23, 2014 10:24:01 AM UTC-4, Louis Thiery wrote: > > Ah finally got my toolchain to work with these instructions: > http://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-Bootloader:U-Boot > > The u-boot.img I compiled out of there works just fine - so now let's see > what happens when I hack it :D > > On Saturday, March 22, 2014 12:46:51 PM UTC-4, Louis Thiery wrote: >> >> Jumping in a little late perhaps but my concern is slightly relevant to >> the discussion here. >> >> Nelson desribes the boot order: >> >> bootrom loads MLO from eMMC (if that fails it moves to microSD) >> MLO loads u-boot.img from eMMC >> u-boot.img first looks at microSD for uEnv.txt, reads that file in. >> >> I'd like to reverse that last step and make it to default to uEnv.txt >> from the eMMC. >> >> But I have no idea how to modify u-boot.img. What should I be reading? >> >> Or is there a u-boot.img that exists already that will allow me to boot >> off of the eMMC even if the flasher uSD is present (which I understand is >> the HW default)? >> >> Thanks, >> Louis >> >> On Friday, March 7, 2014 11:12:13 PM UTC-5, Loren Amelang wrote: >>> >>> My long but successful "learning experience" is reported in: >>> https://groups.google.com/forum/#!topic/beagleboard/zNtdwtPf2Q8 >>> >>> Definitely not simple, but possible... Without making any changes to >>> the eMMC installation! >>> >>> On Monday, February 17, 2014 10:17:22 PM UTC-8, Loren Amelang wrote: >>>> >>>> Robert, >>>> >>>> My BBB absolutely must default to booting from the uSD. I know I >>>> could short the boot switch, or move pull-up/down resistors, or create a >>>> hardware switch gated from reset, but I don't want to lose hardware >>>> compatibility with other BBB boards, or give up the option of manually >>>> booting from eMMC occasionally. The code you suggest here sounds perfect - >>>> but I'm not positive what to do with it. From the formatting of the text, >>>> I >>>> suspect it is intended to be compiled into a new u-boot.img and MLO image, >>>> but I'm not sure how to do that. >>>> >>>> Before I spend hours learning how, is there a chance I could just >>>> insert the basic ideas into my uEnv.txt as "mmcboot=mmc dev 0; if mmc >>>> rescan ; then ..."? It does look like uEnv.txt is read before the mmcboot >>>> command runs... >>>> >>> >>> >> -- 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.
