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EMMC_BACKUP.md

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EMMC Backup Procedure

This procedure is recommended to be performed when your printer is completely setup in a well working condition. It is possible to create complete eMMC backup for about 15 minutes for eMMC size of about 8GB. It is recommended to have at least one complete backup. The procedure uses the uboot functionality to read/write the eMMC and to read/write USB disks. The backup procedure copy the entire eMMC on a USB disk. Then on a Linux host you can create image of the USB disk to have it as a backup file.

To perform a backup follow these steps:

By the uboot console

  1. Use the original app version 2.39 and stop the booting process by holding key 's' (or use any custom firmware update that has the UART enabled)
  2. Insert a USB disk (FAT32 formatted) with the file backup.scr on it for complete emmc backup.
  3. From the uboot shell enter the following:
usb reset
usb dev 0
fatload usb 0:0 42000000 backup.scr

If you see an error, try typing in usb part and see what partitions are available. Then enter:

fatload usb 0:<Enter partition number in here> 42000000 backup.scr

Example:

fatload usb 0:1 42000000 backup.scr

(Partition 1)

  1. Remove the USB disk with the scripts and insert at least 8GB USB disk for a complete backup. It might be formatted or not and it will be completely rewritten by the contents of the eMMC. NOTE: Do not use a disk with important information! All data on it will be lost!

  2. Type the following to execute the script:

source 42000000
  1. Wait about 15 minutes and the entire emmc will be transferred 1:1 to the USB disk sector by sector If you see an error and the script stopped before showing 100%, insert another type USB disk and enter again:
source 42000000
  1. From a Linux machine export the complete backup as a file from the USB disk:
dd if=/dev/sdh of=emmc_backup.bin bs=512 count=15269888 status=progress

Note: replace the /dev/sdh with the device name of your USB disk.

By the standard or the custom xfel tool in uboot mode

This mode can be used when the version you are using has the uart disabled and you are unable to stop the booting process and to enter in the uboot shell.

You could either do:

xfel exec 0x0

to boot into uboot and then enter the commands above or:

  1. Enter the printer in FEL mode and connect the uart to the computer. Open the terminal.
  2. Enter the following:
xfel ddr t113-s3
xfel write 0x43000000 uboot239.bin
xfel exec 0x43000b50

Immediately press and hold key 's' in the terminal until the boot process stop in uboot shell and go to step 3 above

You can modify the script and create new backup.scr image by:

mkimage -T script -n 'EMMC Backup' -d backup.txt backup.scr

By the custom xfel tool in USB mode

TBD