It's not clear to me: why when both eMMC and SD present and contains u-boot (both in raw mode), the CPU decides to boot from eMMC. Is there a way to default to SD? The Technical Reference mentions a timeout, or am I missing anything? Of course, the latest u-boot (in eMMC) does check for SD presence and switches to it, but if I have many BBBs with preinstalled old stuff, I have to press S2 to force booting from SD every time.
On Monday, December 8, 2014 at 9:13:22 AM UTC-7, RobertCNelson wrote: > > On Sat, Dec 6, 2014 at 1:24 AM, <ricky...@gmail.com <javascript:>> > wrote: > > Yes, a lot of things on Linux looks like voodoo magic, and so many > > mysterious codes lying everywhere :) > > > > That said, can you point me to the place where I can learn how that was > > done, and the complete boot mechanism of the BBB? I am trying to learn > the > > boot process(among other things) of the BBB but there are just so much > info > > lying around, some are outdated and some are conflicting. Also does that > > mean I can no longer access or see these two files? Is there a place > where I > > could download the source for the image? > > Page 4934 (mmc raw mode) > > http://www.ti.com/lit/ug/spruh73k/spruh73k.pdf > > > I read your instructions at: > > > > > https://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-SetupmicroSD/SDcard > > > > > and saw that you have only made one partition on the SDcard with both > the > > kernel and file system, and before you format the card you've dd'ed both > the > > MLO and u-boot.img to it. Is this how that was done? And I thought that > was > > a mistake, silly me :) > > Do you you notice how we create a 1Mb hole on the front of the drive > via sfdisk? After that point, the order of dd'ing the bootloader or > mkfs.ext4 the partition doesn't really matter.. > > > I have learned a lot from what you have posted on the web, thank you for > > your work and I look forward to seeing more "Products" from you. Too bad > > there is not a centralized location where we can learn all these for the > > BBB. > > Well there is this mailing list. > > Regards, > > -- > Robert Nelson > http://www.rcn-ee.com/ > -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/d3f55ed0-f142-4d41-8ac3-68dc1199819f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
