Rough exact steps . . .
*On X86 development machine:*
william@eee-pc:~$ cd backup/
william@eee-pc:~/backup$ wget
https://rcn-ee.com/rootfs/bb.org/testing/2016-06-19/console/BBB-blank-debian-8.5-console-armhf-2016-06-19-2gb.img.xz
william@eee-pc:~/backup$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 149.1G 0 disk
├─sda1 8:1 0 9.3G 0 part /
├─sda2 8:2 0 1K 0 part
├─sda5 8:5 0 2G 0 part [SWAP]
└─sda6 8:6 0 137.8G 0 part /home
sdb 8:16 1 29.8G 0 disk
└─sdb1 8:17 1 29.8G 0 part
william@eee-pc:~/backup$ xzcat
BBB-blank-debian-8.5-console-armhf-2016-06-19-2gb.img.xz | sudo dd
of=/dev/sdb
3481600+0 records in
3481600+0 records out
1782579200 bytes (1.8 GB) copied, 500.677 s, 3.6 MB/s
*On Beaglebone:*
*Backup eMMC:*
william@beaglebone:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
mmcblk1boot0 179:16 0 2M 1 disk
mmcblk1boot1 179:24 0 2M 1 disk
mmcblk0 179:0 0 14.7G 0 disk
`-mmcblk0p1 179:1 0 1.7G 0 part /
mmcblk1 179:8 0 3.6G 0 disk
|-mmcblk1p1 179:9 0 96M 0 part
`-mmcblk1p2 179:10 0 3.5G 0 part
william@beaglebone:~$ ls
am33xx-pruss-uio.dts dev remove-modules.sh temp
william@beaglebone:~$ cd dev/
william@beaglebone:~/dev$ ls
C beaglebone_cleanup bonejs dtb-4.4-ti dtb-single javascript misc
test-dts
william@beaglebone:~/dev$ mkdir backup-emmc
william@beaglebone:~/dev$ cd backup-emmc/
*This is an NFS share, so will take a while.*
william@beaglebone:~/dev/backup-emmc$ time sudo dd if=/dev/mmcblk1
of=./2016-07-27-emmc_backup.img bs=1M
[sudo] password for william:
3688+0 records in
3688+0 records out
3867148288 bytes (3.9 GB) copied, 451.522 s, 8.6 MB/s
real 7m36.950s
user 0m0.252s
sys 1m5.144s
william@beaglebone:~/dev/backup-emmc$ sudo halt
*At this point remove the sdcard from the x86 dev machine, and place into
the Beaglebone. Then toggle the power button.If you have a serial debug
cable connected to the beaglebone, you can watch the progress of the
flasher. This should finish very quickly. Once the LEDs all go solid, the
board is in the process of shutting down. Let all LEDs go off, and stay off
before removing the sdcard and attempting to boot from eMMC. Once booted
from eMMC on the Beaglebone you can login via the serial debug terminal. Or
you can login via ssh.*
debian@beaglebone:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
mmcblk0boot0 179:8 0 2M 1 disk
mmcblk0boot1 179:16 0 2M 1 disk
mmcblk0 179:0 0 3.6G 0 disk
`-mmcblk0p1 179:1 0 3.6G 0 part /
debian@beaglebone:~$ uname -r
4.4.12-ti-r31
debian@beaglebone:~$ cat /etc/dogtag
BeagleBoard.org Debian Image 2016-06-19
*Knowing the contents pf /etc/fstab will be helpful at this point. Although
I plan on mounting the eMMC as device namenot by UUID. So I may as well
double check that this will work by changing it now.*
debian@beaglebone:~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
UUID=a84daf59-1ce7-4cf8-af6f-b50652ab71a9 / ext4
noatime,errors=remount-ro 0 1
debugfs /sys/kernel/debug debugfs defaults 0 0
debian@beaglebone:~$ mount |grep mmcblk
/dev/mmcblk0p1 on / type ext4 (rw,noatime,errors=remount-ro,data=ordered)
debian@beaglebone:~$ sudo nano /etc/fstab
Change to:
# /etc/fstab: static file system information.
#
/dev/mmcblk0p1 / ext4 noatime,errors=remount-ro 0 1
debugfs /sys/kernel/debug debugfs defaults 0 0
debian@beaglebone:~$ sudo reboot
*At this point you'll likely see some errors about fsck having issues with
various disk properties. These should besafe to ignore. Now would be the
time to make additional changes if you wish to save the contents of the
eMMC forfuture use. Personally, I need to mount and nfs share so I can now
backup the eMMC via dd.*
debian@beaglebone:~$ sudo nano /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.254.167
netmask 255.255.255.0
gateway 192.168.2254.254
debian@beaglebone:~$ sudo ifdown eth0
debian@beaglebone:~$ sudo ifup eth0
debian@beaglebone:~$ sudo apt-get update
debian@beaglebone:~$ sudo apt-get install nfs-common rpcbind
debian@beaglebone:~$ mkdir dev
debian@beaglebone:~$ sudo mount -o v3 192.168.254.162:/home/william/share
/home/debian/dev
debian@beaglebone:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 10M 0 10M 0% /dev
tmpfs 99M 4.3M 95M 5% /run
/dev/mmcblk0p1 3.5G 367M 3.0G 11% /
tmpfs 247M 0 247M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 247M 0 247M 0% /sys/fs/cgroup
192.168.254.162:/home/william/share 136G 51G 79G 39% /home/debian/dev
*hmmm, a lot of work to do on this image. So maybe I'll bypass doing a
backup.*
debian@beaglebone:~$ sudo halt
[ 4676.329564] reboot: System halted
Switched back to sdcard:
william@beaglebone:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
mmcblk1boot0 179:16 0 2M 1 disk
mmcblk1boot1 179:24 0 2M 1 disk
mmcblk0 179:0 0 14.7G 0 disk
`-mmcblk0p1 179:1 0 1.7G 0 part /
mmcblk1 179:8 0 3.6G 0 disk
`-mmcblk1p1 179:9 0 3.6G 0 part
william@beaglebone:~$ ls /
ID.txt boot etc lib media nfs-uEnv.txt opt root sbin sys
uEnv.txt var
bin dev home lost+found mnt node_modules proc run srv tmp
usr
william@beaglebone:~$ ls /media/
william@beaglebone:~$ sudo mkdir /media/rootfs
william@beaglebone:~$ sudo mount /dev/mmcblk1p1 /media/rootfs/
william@beaglebone:/media/rootfs$ sudo rm -rf /media/rootfs/
william@beaglebone:~$ ls /media/rootfs/ /* Crickets . . . */
*Switched to x86 dev machine:*
william@eee-pc:~$ ls cleanup/downloads/linux-images/
bone-debian-7.7-console-armhf-2014-11-19-2gb.img
bone-debian-8.0-console-armhf-2015-05-04-2gb.img
bone-debian-7.8-console-armhf-2015-03-01-2gb.img v3.8.13-bone47
william@eee-pc:~$ sudo fdisk -lu
cleanup/downloads/linux-images/bone-debian-7.8-console-armhf-2015-03-01-2gb.img
Disk
cleanup/downloads/linux-images/bone-debian-7.8-console-armhf-2015-03-01-2gb.img:
1782 MB, 1782579200 bytes
184 heads, 31 sectors/track, 610 cylinders, total 3481600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
cleanup/downloads/linux-images/bone-debian-7.8-console-armhf-2015-03-01-2gb.img1
* 2048 3481599 1739776 83 Linux
*offset= 512 * 2048 or sector size * start*
william@eee-pc:~$ sudo mount -o loop,offset=1048576
cleanup/downloads/linux-images/bone-debian-7.8-console-armhf-2015-03-01-2gb.img
/media/rootfs/
william@eee-pc:~$ cd /media/rootfs/
william@eee-pc:/media/rootfs$ ls
bin dev home lib media nfs-uEnv.txt proc run selinux
sys uEnv.txt usr
boot etc ID.txt lost+found mnt opt root sbin srv
tmp uEnv.txt.save var
william@eee-pc:/media/rootfs$ cat etc/dogtag
BeagleBoard.org Debian Image 2015-03-01
william@eee-pc:/media/rootfs$ sudo tar -zcvpf ~/test-rootfs.tar.gz .
william@eee-pc:/media/rootfs$ cd ~
william@eee-pc:~$ sudo umount /media/rootfs/
william@eee-pc:~$ mv test-rootfs.tar.gz share/
*switch back to beaglebone:*
william@beaglebone:~$ cd dev/
william@beaglebone:~/dev$ ls | grep rootfs
test-rootfs.tar.gz
william@beaglebone:~/dev$ sudo tar xzvf ./test-rootfs.tar.gz -C
/media/rootfs/
william@beaglebone:~/dev$ ls /media/rootfs/
ID.txt boot etc lib media nfs-uEnv.txt proc run selinux
sys uEnv.txt usr
bin dev home lost+found mnt opt root sbin srv
tmp uEnv.txt.save var
william@beaglebone:~$ cd /media/rootfs/
william@beaglebone:/media/rootfs$ cat etc/fstab
# /etc/fstab: static file system information.
#
# Auto generated by RootStock-NG: setup_sdcard.sh
#
/dev/mmcblk0p1 / ext4 noatime,errors=remount-ro 0 1
debugfs /sys/kernel/debug debugfs defaults 0 0
*Looks good.*
william@beaglebone:/media/rootfs$ cat etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.254.167
netmask 255.255.255.0
gateway 192.168.254.254
william@beaglebone:/media/rootfs$ cat etc/resolv.conf
nameserver 192.168.254.254
william@beaglebone:/media/rootfs$ head boot/uEnv.txt
#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0
uname_r=3.8.13-bone70
#dtb=
cmdline=root=/dev/mmcblk0p1
##Example
#cape_disable=capemgr.disable_partno=
#cape_enable=capemgr.enable_partno=
william@beaglebone:/media/rootfs$ cd ~
william@beaglebone:~$ sudo umount /media/rootfs/
william@beaglebone:~/dev$ sudo halt
*Remove sdcard and toggle the power button.*
debian@beaglebone:~$ uname -r
3.8.13-bone70
debian@beaglebone:~$ cat /etc/dogtag
BeagleBoard.org Debian Image 2015-03-01
debian@beaglebone:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
mmcblk0boot0 179:8 0 2M 1 disk
mmcblk0boot1 179:16 0 2M 1 disk
mmcblk0 179:0 0 3.6G 0 disk
`-mmcblk0p1 179:1 0 3.6G 0 part /
--
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