TS-4720 eMMC Backup/restore: Difference between revisions
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| [[File:eMMC.png|70px|link=ftp://ftp.embeddedarm.com/ts-socket-macrocontrollers/ts-4710-linux/binaries/ts-images/ | | [[File:eMMC.png|70px|link=ftp://ftp.embeddedarm.com/ts-socket-macrocontrollers/ts-4710-linux/binaries/ts-images/emmc-dblstor-latest.dd.bz2]] | ||
| [ftp://ftp.embeddedarm.com/ts-socket-macrocontrollers/ts-4710-linux/binaries/ts-images/ | | [ftp://ftp.embeddedarm.com/ts-socket-macrocontrollers/ts-4710-linux/binaries/ts-images/emmc-dblstor-latest.dd.bz2 Click to download the latest 4GB 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 | {{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: | 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: | ||
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</source> | </source> | ||
Once you are in the initramfs, mount a network share or usb drive containing the emmc image. | |||
''' Write an Image to eMMC ''' | ''' Write an Image to eMMC ''' | ||
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umount -l /mnt/root/ | umount -l /mnt/root/ | ||
# Tell sdctl to pause so we don't kill it during a burst | |||
killall -USR1 sdctl | |||
# Allow time for any buffered writes to finish | |||
sleep 5 | |||
killall sdctl | |||
# The dblstor-disable command only tells the card to | |||
# ignore any doublestore metadata on the eMMC during | |||
# this write. It does not prevent reading/writing doublestore | |||
# formatted media. | |||
# This command can be expected to take about 10 minutes | |||
sdctl --lun 1 -z 65536 --dblstor-disable -i /mnt/usbdev/emmc-image.dd | |||
reboot | reboot | ||
</source> | </source> | ||
These steps can write the eMMC image to use a single-card [[#Doublestore]], or you can write the [ftp://ftp.embeddedarm.com/ts-socket-macrocontrollers/ts-4710-linux/binaries/ts-images/4gbsd-471x-latest.dd.bz2 SD Image] to not use doublestore. | |||
''' Save an image from eMMC ''' | ''' Save an image from eMMC ''' | ||
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umount -l /mnt/root/ | umount -l /mnt/root/ | ||
dd if=/dev/nbd1 bs=4M of=/mnt/usbdev/ | # Tell sdctl to pause so we don't kill it during a burst | ||
killall -USR1 sdctl | |||
# Allow time for any buffered writes to finish | |||
sleep 5 | |||
killall sdctl | |||
sdctl --lun 1 -z 65536 --dblstor-disable --nbdserver lun1:disc | |||
nbd-client 127.0.0.1 7500 /dev/nbd1 | |||
# This can take about 15 minutes | |||
dd if=/dev/nbd1 bs=4M of=/mnt/usbdev/emmc-image.dd | |||
umount /mnt/usbdev | umount /mnt/usbdev | ||
sync | sync | ||
</source> | </source> | ||
Revision as of 09:48, 14 August 2014
|
Click to download the latest 4GB 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
# Check /mnt/root. If it shows a file "root.version", you can proceed.
# If it shows nothing, you need to wait for the Debian filesystem
until [ -e /mnt/root/root.version ]; do sleep .1; done
# Plug in a thumbdrive formatted with ext2/3/4 or fat32/ntfs
mkdir /mnt/usbdev
mount -o ro /dev/sda1 /mnt/usbdev
umount -l /mnt/root/
# Tell sdctl to pause so we don't kill it during a burst
killall -USR1 sdctl
# Allow time for any buffered writes to finish
sleep 5
killall sdctl
# The dblstor-disable command only tells the card to
# ignore any doublestore metadata on the eMMC during
# this write. It does not prevent reading/writing doublestore
# formatted media.
# This command can be expected to take about 10 minutes
sdctl --lun 1 -z 65536 --dblstor-disable -i /mnt/usbdev/emmc-image.dd
reboot
These steps can write the eMMC image to use a single-card #Doublestore, or you can write the SD Image to not use doublestore.
Save an image from eMMC
# Check /mnt/root. If it shows a file "root.version", you can proceed.
# If it shows nothing, you need to wait for the Debian filesystem
until [ -e /mnt/root/root.version ]; do sleep .1; done
# Plug in a thumbdrive formatted with ext2/3/4 or fat32
mkdir /mnt/usbdev
mount /dev/sda1 /mnt/usbdev
umount -l /mnt/root/
# Tell sdctl to pause so we don't kill it during a burst
killall -USR1 sdctl
# Allow time for any buffered writes to finish
sleep 5
killall sdctl
sdctl --lun 1 -z 65536 --dblstor-disable --nbdserver lun1:disc
nbd-client 127.0.0.1 7500 /dev/nbd1
# This can take about 15 minutes
dd if=/dev/nbd1 bs=4M of=/mnt/usbdev/emmc-image.dd
umount /mnt/usbdev
sync