After backing up eMMC contents to SD card and then restoring via method
similar to mentioned
in http://elinux.org/BeagleBone_Black_Extracting_eMMC_contents, booting
from a SD card and using dd to write to eMMC I have issue with failed write
with error "Out of disk space" being reported.
Firing up two Rev C cards, one from Mouser and one from Element14 show
following differences running fdisk /dev/mmcblk0
Disk /dev/mmcblk0: 3925 MB, 3925868544 bytes
4 heads, 16 sectors/track, 119808 cylinders, total 7667712 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 * 2048 198655 98304 e W95 FAT16 (LBA)
/dev/mmcblk0p2 198656 7553023 3677184 83 Linux
Disk /dev/mmcblk0: 3867 MB, 3867148288 bytes
4 heads, 16 sectors/track, 118016 cylinders, total 7553024 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 * 2048 198655 98304 e W95 FAT16 (LBA)
/dev/mmcblk0p2 198656 7553023 3677184 83 Linux
Now as luck would have it (and I actually do consider failure at this point
as good luck) I created the image on BBB reporting larger disk size.
Now maybe I am misinterpreting error message and disk sizes but it does tie
up with error message.
Does anyone have any experience with this or suggested solution? While it
would be ideal if all 4GB flash memories were the exact same size I assume
this is not possible and one would have to build some buffer in and
reduce/truncate the image size without destroying data integrity.
Appreciate any help/suggestions.
Colin
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