75XX MicroSD Recovery: Difference between revisions
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| Line 12: | Line 12: | ||
Entire SD card | Entire SD card | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=32k | dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=32k && sync && sync | ||
</source> | </source> | ||
Kernel | Kernel | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/mmcblk0p2 of=/path/to/zImage bs=32k | dd if=/dev/mmcblk0p2 of=/path/to/zImage bs=32k && sync && sync | ||
</source> | </source> | ||
Initrd | Initrd | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/mmcblk0p3 of=/path/to/initrd bs=32k | dd if=/dev/mmcblk0p3 of=/path/to/initrd bs=32k && sync && sync | ||
</source> | </source> | ||
| Line 29: | Line 29: | ||
Entire SD card | Entire SD card | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/path/to/backup.dd of=/dev/mmcblk0 bs=32k | dd if=/path/to/backup.dd of=/dev/mmcblk0 bs=32k && sync | ||
</source> | </source> | ||
Kernel | Kernel | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/path/to/zImage bs=32k of=/dev/mmcblk0p2 | dd if=/path/to/zImage bs=32k of=/dev/mmcblk0p2 && sync | ||
</source> | </source> | ||
Initrd | Initrd | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/initrd bs=32k of=/dev/mmcblk0p3 | dd if=/initrd bs=32k of=/dev/mmcblk0p3 && sync | ||
</source> | </source> | ||
| Line 50: | Line 50: | ||
# Determine the block size | # Determine the block size | ||
eval $(sdctl) | eval $(sdctl) | ||
dd if=/dev/nbd5 of=/path/to/backup.dd bs=512 count=$cardsize_sectors conv=sync | dd if=/dev/nbd5 of=/path/to/backup.dd bs=512 count=$cardsize_sectors conv=sync && sync | ||
</source> | </source> | ||
| Line 67: | Line 67: | ||
The entire card from SBC | The entire card from SBC | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/path/to/2gbsd-noeclipse-latest.dd bs=512 conv=sync of=/dev/nbd5 | dd if=/path/to/2gbsd-noeclipse-latest.dd bs=512 conv=sync of=/dev/nbd5 && sync | ||
</source> | </source> | ||
Kernel | Kernel | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/mnt/root/zImage bs=512 conv=sync of=/dev/nbd7 | dd if=/mnt/root/zImage bs=512 conv=sync of=/dev/nbd7 && sync | ||
</source> | </source> | ||
Initrd | Initrd | ||
<source lang=bash> | <source lang=bash> | ||
dd if=/mnt/root/initrd bs=512 conv=sync of=/dev/nbd8 | dd if=/mnt/root/initrd bs=512 conv=sync of=/dev/nbd8 && sync | ||
</source> | </source> | ||
Revision as of 09:55, 23 March 2012
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.
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