TS-4720 eMMC Backup/restore

From Technologic Systems Manuals
EMMC.png Click to download the latest 2GB eMMC image.
WARNING: Make sure the SD and eMMC filesystems are mounted read only while writing any images. If dd is used to read or write a disk while a filesystem on it is mounted read/write this can result in a corrupt image.

First boot to the initramfs. These steps should not be run from the full Debian environment, so to get back to the initramfs, first run:

tshwctl --removejp 1 && reboot

Once you are in the initramfs, mount a network share or usb drive containing the emmc image.

Write an Image to eMMC

# Plug in a thumbdrive formatted with ext2/3/4 or fat32/ntfs
mkdir /mnt/usbdev
mount -o ro /dev/sda1 /mnt/usbdev
dd if=/mnt/usbdev/emmc-image.dd bs=4M of=/dev/nbd1

Save an image from eMMC

# Plug in a thumbdrive formatted with ext2/3/4 or fat32/ntfs
mkdir /mnt/usbdev
mount -o ro /dev/sda1 /mnt/usbdev
# This can take about 15 minutes
dd if=/dev/nbd1 bs=4M of=/mnt/usbdev/emmc-image.dd
umount /mnt/usbdev
sync