TS-4900 eMMC Backup/restore

Write the image:

These commands assume you are booted to the SD card, and

# Verify nothing else has this mounted
umount /dev/mmcblk2p1

mkfs.ext3 /dev/mmcblk2p1
mkdir /mnt/emmc
mount /dev/mmcblk2p1 /mnt/emmc
wget ftp://ftp.embeddedarm.com/ts-socket-macrocontrollers/ts-4900-linux/distributions/yocto/morty/ts-x11-image-tsimx6-latest.rootfs.tar.bz2
tar --numeric-owner -xf ts-x11-image-tsimx6-latest.rootfs.tar.bz2 -C /mnt/emmc
umount /mnt/emmc
sync

Note:

The ext4 filesystem can be used instead of ext3, but it may require additional options. U-Boot does not support the 64bit addressing added as the default behavior in recent revisions of mkfs.ext4. If using e2fsprogs 1.43 or newer, the options "-O ^64bit,^metadata_csum" must be used with ext4 for proper compatibility. Older versions of e2fsprogs do not need these options passed nor are they needed for ext3.

After it is written you can verify the data was written correctly.

# Drop any block cache
echo 3 > /proc/sys/vm/drop_caches
mount /dev/mmcblk2p1 /mnt/emmc
cd /mnt/emmc/
sudo md5sum -c md5sums.txt
umount /mnt/emmc
sync

The md5sum command will report what differences there are, if any, and return if it passed or failed.

Backup the image:

First boot the board to any SD image. The SD should have enough space for the compressed image of your eMMC. From our default image this is ~500MB. To create an image to your SD card:

mkdir /mnt/sd/
mount /dev/mmcblk1p1 /mnt/sd/
cd /mnt/sd/
tar --numeric-owner -cjf /root/backup.tar.bz2 *
cd -
umount /mnt/sd/