Jan: I also had problems restoring and copying a BBB image for the Rev.C (4 GB eMMC) and the new larger Debian distributions, particularly if you have added additional code and updates to the distribution for your application.
I suspect that the existing instructions/methods assume smaller code and memory sizes. I have been successful duplicating a Debian 8 (jessie) that has had upgrades and my application code added to it on a Rev.C BBB. 1.) Use a uSD card larger than 4 GB. You will need something larger than 4 GB to save a 4 GB image using dd. I used 16 GB, but you can not go larger than 32 GB at this time. 2.) Install one of the Debian distributions on the uSD card. I chose bone-debian-7.7-console-armhf-2014-11-19-2gb.img 3.) If you examine the installation, it is using less than 2 GB of the card. Use Gparted to expand the partition size to the full size of the card. In my case, 16 GB, which gives me room on the card to hold multiple 4 GB ".img" files. 4.) Plug the uSD card into the BBB for which you want to copy the eMMC and apply power. The console distribution I chose boots straight onto the uSD card, without pressing the S2 button. If you use some other distribution, things may work differently. 5.) Sign in as 'root' and enter dd if=/dev/mmcblk1 of=/mnt/BeagleBoneBlack-eMMC-image-$RANDOM.img bs=10M 6.) Wait 9 minutes for the command to return to the command line. It takes about 2 minutes per GB to build the ".img" file. type sync. The completed file will be located at /mnt/ The ".img" file will be slightly less than 4 GB in size 7.) Shutdown this BBB, and plug the uSD card in the target BBB. 8.) Power up the target BBB and sign in as root, and type on the command line dd if=/mnt/BeagleBoneBlack-eMMC-image-NUMBER.img of=/dev/mmcblk1 bs=10M where NUMBER is the random number of the img that was generated in step (5). 9.) Wait 9 minutes for the command to return, sync, shutdown, remote uSD card and re-power the target. The target should now be a duplicate. Other thoughts: You can compress the "img" file on the BBB by xz BeagleBoneBlack-eMMC-image-NUMBER.img BUT it will take 2 Hours on the BBB to compress a 4 GB file, when booted on an uSD card. You are much better off moving the file to an external machine to compress it. You can do a SSH copy of the "img" file to an external (Linux) machine via the Ethernet connection by doing something like: scp root@192.168.1.200:/mnt/BeagleBoneBlack-eMMC-image-NUMBER.img /home/your-name/Images/ It will transfer at around 8 MB per second, if the BBB is otherwise idle. --- Graham == On Wednesday, November 26, 2014 8:19:30 PM UTC-6, janszyma...@gmail.com wrote: > > I was able to save the contents of eMMC as an *.img following this link > http://elinux.org/BeagleBone_Black_Extracting_eMMC_contents > <http://www.google.com/url?q=http%3A%2F%2Felinux.org%2FBeagleBone_Black_Extracting_eMMC_contents&sa=D&sntz=1&usg=AFQjCNGM_Ak68pR603ZNyLkvVfB48DSN2A> > > , > into 4GB FAT32 uSD card, no button pressing. After that I modified > autorun.sh as per instruction from the same side. > The restore on the same board doesn't hapen, however. Any hints? > Jan > > On Sunday, 23 November 2014 01:22:06 UTC+11, rspie...@gmail.com wrote: >> >> Just in case somebody finds it useful: >> >> The duplication has worked now! >> I did it according to first stack overflow answer and the reference here: >> http://elinux.org/BeagleBone_Black_Extracting_eMMC_contents >> <http://www.google.com/url?q=http%3A%2F%2Felinux.org%2FBeagleBone_Black_Extracting_eMMC_contents&sa=D&sntz=1&usg=AFQjCNGM_Ak68pR603ZNyLkvVfB48DSN2A> >> >> The preparation of the microSD card can only be done under a Linux >> environment - at least I did not manage to prepare it under Windows. >> The root file system was now 2GB in size - although the Rev C has 4 GB. >> Resizing was done exactly like in >> >> http://blog.asiantuntijakaveri.fi/2014/05/flashing-beaglebone-black-rev-b-2gb.html >> >> ----" >> What you want to do next is resize root partition to fill entire eMMC, >> otherwise you're leaving few hunded megabytes of capacity unused and rev B >> internal 2GB eMMC is already a bit on small side for full blown Linux >> install. Below steps will of course work for SD card rootfs as well. >> >> # Switch to root >> sudo su - >> >> # Delete and recreate root partition using entire disk >> # internal eMMC is called mmcblk0 now as we don't have any SD cards >> connected >> fdisk /dev/mmcblk0 >> # Delete partition #2 (type "d" and then "2") >> # Create new partition (type "n" and hit enter four times to accept >> defaults) >> # Write changes (type "w") >> >> # Reboot so new partition table gets read >> reboot >> >> # Login again as root and resize root fs >> resize2fs /dev/mmcblk0p2 >> >> "--- >> >> Works like a charm! >> > -- 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.
