TS-75xx doublestore recovery

From Technologic Systems Manuals

These instructions for rewriting the SD card must be done either on the arm system, or on a linux workstation. We do not support any method using Windows to rewrite the cards, but many virtual machines offer USB redirection which will also work with the USB card reader supplied in the development kit. The methods using dd and sdctl to rewrite the SD card will completely erase everything on the card and set up our MBR, kernel, intird, and Debian filesystem. No prior formatting to the card is needed.

After plugging in the USB adapter to your PC you will need to determine the block device. You can usually find this in the output of 'dmesg' after inserting the SD card and you will typically see something like '/dev/sdb' as the block device and '/dev/sdb1' for the first partition. On some newer kernels you will see '/dev/mmcblk0' as the block device and '/dev/mmcblkop1' for the first partition. For these examples I will use the '/dev/mmcblk0' format.

You can find the latest SD card image here. Make sure you decompress the image first before writing. For example to decompress on most Linux workstations you can run:

bzip2 -d dblstorimg-4gbsd-latest.dd.bz2

To update to our latest image from your workstation:

dd if=/path/to/dblstorimg-4gbsd-latest.dd of=/dev/mmcblk0 bs=32k && sync && sync

From Workstation


Backup

Entire SD card

dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=32k && sync && sync

Kernel

dd if=/dev/mmcblk0p2 of=/path/to/zImage bs=32k && sync && sync

Initrd

dd if=/dev/mmcblk0p3 of=/path/to/initrd bs=32k && sync && sync

Restore

Entire SD card

dd if=/path/to/backup.dd of=/dev/mmcblk0 bs=32k && sync

Kernel

dd if=/path/to/zImage bs=32k of=/dev/mmcblk0p2 && sync

Initrd

dd if=/initrd bs=32k of=/dev/mmcblk0p3 && sync

From SBC


Backup

Entire card

# Determine the block size
eval $(sdctl)
dd if=/dev/nbd5 of=/path/to/backup.dd bs=512 count=$cardsize_sectors conv=sync && sync

Kernel

sdctl -R 4096 -z 512 --seek part1 > kernel

Initrd

sdctl -R 4096 -z 512 --seek part2 > initrd

Restore

The entire card from SBC

dd if=/path/to/2gbsd-noeclipse-latest.dd bs=512 conv=sync of=/dev/nbd5 && sync

Kernel

dd if=/mnt/root/zImage bs=512 conv=sync of=/dev/nbd7 && sync

Initrd

dd if=/mnt/root/initrd bs=512 conv=sync of=/dev/nbd8 && sync