Paul, If I'm not mistaken, emmc has priority over the sd card during normal boot.
On Friday, April 17, 2015 at 3:03:17 PM UTC-7, Paul Larson wrote: > > I'm trying to do automated testing of some new images on BBB. The current > solution I'm looking at is to keep a stable image on the emmc (default > debian image at the moment, but I'm not *too* picky here), and use it to > flash the new image on the sd card, then trigger a reboot into the new > image. I cannot assume at any time that the new image I'm flashing to the > sd works well, or even boots at all, so I need a way to get back to the > image on the emmc. > > Fortunately, I've got pretty good access to network controllable relays > and power. So I can automate the process of powering off the device, > instrument the s2 button with a relay, and even check in uboot that s2 is > pressed and force booting to the sd card. The problem I'm having is that > for some reason, even when I boot without pressing s2, it winds up booting > the image that's on the sd card - I suspect maybe because it finds a > uEnv.txt there when searching the mmc? I've also noticed that I cannot > saveenv when I boot from the emmc and get into uboot there, but I can when > I boot with s2 held and boot into the uboot from my image on the sdcard. If > I set things in the environment and save them from there though, they don't > show up in printenv when I boot off the emmc. > > So that was a bit of a mouth full... if I were to distill it down to a > single question - is there a something I can do to the debian or ubuntu > image running off the emmc to ensure that when s2 is *not* pressed, it will > boot the image on the emmc regardless of what's on the sd card? > > Thanks, > Paul Larson > -- 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.
