From: <dmitryp...@gmail.com> Reply-To: <beagleboard@googlegroups.com> Date: Wednesday, December 4, 2013 at 1:50 PM To: <beagleboard@googlegroups.com> Subject: [beagleboard] How to make BeagleBone black boot off SD card
> Good afternoon, > I don't understand how to determine whether the BBB is booting off the SD card > or booting off the internal flash. > Here's what happened, I installed a 4GB image from getting started section > onto my SD card > This was the first image here: > http://beagleboard.org/latest-images > > > Initially I powered on by holding the button next to SD card, It booted and I > could tell it was not the internal image, because it did not have the demo > applications. > > Next, I tried hitting the reset button to see if it will boot off the SD card > again, nothing happened and I could not connect to the BBB any more. I scanned > all ports and it was not available. > > I tried resetting and holding down the button again, but it would not boot off > the SD card. > > Only when I take out the SD card the BBB boots into the original installation. > > Does anyone know what may have caused this? This is a brand new SD card, and I > doubt I had damaged it by resetting the BBB. > > As far as I understand there are 3 booting options, > 1. There is booting off internal NAND which only has 70mb (or is this only a > partition > 2. > 3. Booting off SD card > 4. "If using BeagleBone Black and the image is meant to program your on-board > eMMC, you'll need to wait while the programming occurs. When the flashing is > complete, all 4 USRx LEDs will be lit solid. This can take up to 45 minutes." > > What I don't understand is how to select how the device boots. How can I make > it boot off the SD card every time? How do I prevent it from writing to the > NAND? I want to prevent damaging anything by overwriting the NAND and only > work within an SD Card. > > Wouldn't it have been easier to install a jumper to select which memory the > device boots from? Please refer to my porting from earlier today which explains how u-boot selects the device to boot from. In essence. If the SDCard is present, it will attempt to boot from the SDCard FAT partition. If the SDCard isn¹t present, it will boot from the eMMC FAT partition (the linux filesystem is on the EXT4 partition). Regards, John > > Thanks, > -- > 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/groups/opt_out. -- 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/groups/opt_out.
