4700 Backup/Restore SD: Difference between revisions
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If you are backing up directly on the board you will likely need to use some kind of offboard storage like a thumbdrive or external hard drive. Make sure you have any nbd devices unmounted before trying to restore new ones. | If you are backing up directly on the board you will likely need to use some kind of offboard storage like a thumbdrive or external hard drive. Make sure you have any nbd devices unmounted before trying to restore new ones. | ||
You can find the latest SD card image [ | You can find the latest SD card image [https://files.embeddedTS.com/ts-socket-macrocontrollers/ts-4700-linux/binaries/ts-images/2gbsd-4700-latest.dd.bz2 here]. Make sure you decompress the image first before writing. | ||
{{Note|Not all SD cards are created equally, over time they tend to shrink in size due to automatic retiring of bad blocks. All of Technologic System's images are 10% smaller than the target disc size. We STRONGLY recommend following that same practice on any mass-replicated images.}} | {{Note|Not all SD cards are created equally, over time they tend to shrink in size due to automatic retiring of bad blocks. All of Technologic System's images are 10% smaller than the target disc size. We STRONGLY recommend following that same practice on any mass-replicated images.}} | ||
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Entire SD card | Entire SD card | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/mmcblk0 of=/path/to/backup.dd bs= | dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=4M | ||
</source> | </source> | ||
{{Note|Not all SD cards are created equally, over time they tend to shrink in size due to automatic retiring of bad blocks. All of Technologic System's images are 10% smaller than the target disc size. We STRONGLY recommend following that same practice on any mass-replicated images.}} | {{Note|Not all SD cards are created equally, over time they tend to shrink in size due to automatic retiring of bad blocks. All of Technologic System's images are 10% smaller than the target disc size. We STRONGLY recommend following that same practice on any mass-replicated images.}} | ||
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Kernel | Kernel | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/mmcblk0p2 of=/path/to/zImage bs= | dd if=/dev/mmcblk0p2 of=/path/to/zImage bs=4M | ||
</source> | </source> | ||
Initrd | Initrd | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/mmcblk0p3 of=/path/to/initrd bs= | dd if=/dev/mmcblk0p3 of=/path/to/initrd bs=4M | ||
</source> | </source> | ||
| Line 32: | Line 32: | ||
Entire SD card | Entire SD card | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/path/to/backup.dd of=/dev/mmcblk0 bs= | dd if=/path/to/backup.dd of=/dev/mmcblk0 bs=4M | ||
</source> | </source> | ||
Kernel | Kernel | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/path/to/zImage bs= | dd if=/path/to/zImage bs=4M of=/dev/mmcblk0p2 | ||
</source> | </source> | ||
Initrd | Initrd | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/initrd bs= | dd if=/initrd bs=4M of=/dev/mmcblk0p3 | ||
</source> | </source> | ||
| Line 51: | Line 51: | ||
Entire card | Entire card | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/mmcblk0 of=/path/to/backup.dd | dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=4M | ||
</source> | </source> | ||
| Line 68: | Line 68: | ||
The entire card from SBC | The entire card from SBC | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/path/to/2GB-mSD-4700-latest.dd of=/dev/mmcblk0 | dd if=/path/to/2GB-mSD-4700-latest.dd of=/dev/mmcblk0 bs=4M | ||
</source> | </source> | ||
| Line 80: | Line 80: | ||
dd if=/mnt/root/initrd of=/dev/mmcblk0p3 | dd if=/mnt/root/initrd of=/dev/mmcblk0p3 | ||
</source> | </source> | ||
''' Expected Partition Layout ''' | |||
{| class="wikitable" | |||
|- | |||
! Partition | |||
! Contents | |||
|- | |||
| 1 | |||
| FAT32 (empty) | |||
|- | |||
| 2 | |||
| kernel binary (0xda) | |||
|- | |||
| 3 | |||
| initrd (0xda) | |||
|- | |||
| 4 | |||
| Debian root filesystem (EXT3) | |||
|} | |||
Latest revision as of 16:22, 17 January 2022
If backing up on a separate workstation, keep in mind windows does not have direct block device support needed to write these images. You will also need to determine the SD card 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.
If you are backing up directly on the board you will likely need to use some kind of offboard storage like a thumbdrive or external hard drive. Make sure you have any nbd devices unmounted before trying to restore new ones.
You can find the latest SD card image here. Make sure you decompress the image first before writing.
| Note: | Not all SD cards are created equally, over time they tend to shrink in size due to automatic retiring of bad blocks. All of Technologic System's images are 10% smaller than the target disc size. We STRONGLY recommend following that same practice on any mass-replicated images. |
From Workstation
Backup
Entire SD card
dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=4M
| Note: | Not all SD cards are created equally, over time they tend to shrink in size due to automatic retiring of bad blocks. All of Technologic System's images are 10% smaller than the target disc size. We STRONGLY recommend following that same practice on any mass-replicated images. |
Kernel
dd if=/dev/mmcblk0p2 of=/path/to/zImage bs=4M
Initrd
dd if=/dev/mmcblk0p3 of=/path/to/initrd bs=4M
Restore
Entire SD card
dd if=/path/to/backup.dd of=/dev/mmcblk0 bs=4M
Kernel
dd if=/path/to/zImage bs=4M of=/dev/mmcblk0p2
Initrd
dd if=/initrd bs=4M of=/dev/mmcblk0p3
From SBC
Backup
Entire card
dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=4M
Kernel
dd if=/dev/mmcblk0p2 of=/path/to/backup.dd
Initrd
dd if=/dev/mmcblk0p3 of=/path/to/backup.dd
Restore
The entire card from SBC
dd if=/path/to/2GB-mSD-4700-latest.dd of=/dev/mmcblk0 bs=4M
Kernel
dd if=/mnt/root/zImage of=/dev/mmcblk0p2
Initrd
dd if=/mnt/root/initrd of=/dev/mmcblk0p3
Expected Partition Layout
| Partition | Contents |
|---|---|
| 1 | FAT32 (empty) |
| 2 | kernel binary (0xda) |
| 3 | initrd (0xda) |
| 4 | Debian root filesystem (EXT3) |