75XX MicroSD Recovery: Difference between revisions
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''' From Workstation ''' | ''' From Workstation ''' | ||
---- | |||
Backup | '''Backup ''' | ||
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 | ||
</source> | </source> | ||
Kernel | |||
<source lang=bash> | <source lang=bash> | ||
dd if=/ | dd if=/dev/mmcblk0p2 of=/path/to/zImage bs=32k | ||
</source> | </source> | ||
Initrd | |||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/ | dd if=/dev/mmcblk0p3 of=/path/to/initrd bs=32k | ||
</source> | |||
''' Restore''' | |||
Entire SD card | |||
<source lang=bash> | |||
dd if=/path/to/backup.dd of=/dev/mmcblk0 bs=32k | |||
</source> | </source> | ||
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 | ||
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''' From SBC ''' | ''' From SBC ''' | ||
---- | |||
Backup | '''Backup''' | ||
Entire card | |||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/nbd5 of=/path/to/backup.dd bs=512 conv=sync | dd if=/dev/nbd5 of=/path/to/backup.dd bs=512 conv=sync | ||
</source> | </source> | ||
Kernel | |||
<source lang=bash> | <source lang=bash> | ||
dd if=/path/to/ | dd if=/dev/nbd7 of=/path/to/zImage bs=512 conv=sync | ||
</source> | </source> | ||
Initrd | |||
<source lang=bash> | <source lang=bash> | ||
dd if=/dev/ | dd if=/dev/nbd8 of=/path/to/initrd bs=512 conv=sync | ||
</source> | </source> | ||
Restore | '''Restore''' | ||
The entire card from SBC | |||
<source lang=bash> | <source lang=bash> | ||
dd if=/ | dd if=/path/to/2gbsd-noeclipse-latest.dd bs=512 conv=sync of=/dev/nbd5 | ||
</source> | </source> | ||
Kernel | |||
<source lang=bash> | <source lang=bash> | ||
dd if=/ | dd if=/mnt/root/zImage bs=512 conv=sync of=/dev/nbd7 | ||
</source> | </source> | ||
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 | ||
</source> | </source> | ||
Revision as of 15:47, 10 August 2011
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.
From Workstation
Backup Entire SD card
dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=32k
Kernel
dd if=/dev/mmcblk0p2 of=/path/to/zImage bs=32k
Initrd
dd if=/dev/mmcblk0p3 of=/path/to/initrd bs=32k
Restore
Entire SD card
dd if=/path/to/backup.dd of=/dev/mmcblk0 bs=32k
Kernel
dd if=/path/to/zImage bs=32k of=/dev/mmcblk0p2
From SBC
Backup Entire card
dd if=/dev/nbd5 of=/path/to/backup.dd bs=512 conv=sync
Kernel
dd if=/dev/nbd7 of=/path/to/zImage bs=512 conv=sync
Initrd
dd if=/dev/nbd8 of=/path/to/initrd bs=512 conv=sync
Restore
The entire card from SBC
dd if=/path/to/2gbsd-noeclipse-latest.dd bs=512 conv=sync of=/dev/nbd5
Kernel
dd if=/mnt/root/zImage bs=512 conv=sync of=/dev/nbd7
Initrd
dd if=/mnt/root/initrd bs=512 conv=sync of=/dev/nbd8