Cloning eMMC

[Palmer Frye]

Hello,

I am attempting to clone the eMMC from a working device to a newly built device.  I believe I have correctly cloned the eMMC but the target device will not boot and produces no serial console output.  Below I have laid out my procedure for cloning the eMMC.  The process seems fairly straight forward and I can’t see why it would fail to boot.  I have tried the procedure on multiple target devices with no luck.

1.Boot working device off SD card (has extra partition and space for img files)

2. Create image files on SD card from working eMMC

dd if=/dev/mmcblk2boot0 of=/sdCardMountpath/boot0.img conv=fdatasync

dd if=/dev/mmcblk2boot1 of=/sdCardMountpath/boot1.img conv=fdatasync

dd if=/dev/mmcblk2 of=/sdCardMountpath/main.img conv=fdatasync

3. Boot target device off SD card

4. Unlock emmc boot areas on target eMMC

echo 0 > /sys/block/mmcblk2boot0/force_ro

echo 0 > /sys/block/mmcblk2boot1/force_ro

5. Restore images to target eMMC

dd if=/sdCardMountpath/boot0.img of=/dev/mmcblk2boot0 conv=fdatasync

dd if=/sdCardMountpath/boot1.img of=/dev/mmcblk2boot1 conv=fdatasync

dd if=/sdCardMountpath/main.img of=/dev/mmcblk2 conv=fdatasync

 

I have compared the memory areas using cmp to ensure I have an identical copy of the eMMC.

 

[mwlinux]

Maybe this one is missing

mmc bootpart enable 1 1 /dev/mmcblk1

1	mmc bootpart enable 1 1 /dev/mmcblk1

BR Michal

[Palmer Frye]

Yeah that was the solution

Thanks, Eddie

[Author]

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