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As a result of a design discussion, we have resized some partitions of the NAND of the CC6UL as described in https://confluence.digi.com/display/CCUL/New+partition+layout+for+CC6UL.

I have merged the change yesterday to the source code. Starting from last night on our build server (and in next U-Boot release), U-Boot will default to the new partition table. 
Remember that the NAND partition table is nothing else than a string saved in U-Boot environment variable 'mtdparts'.
To make use of the new layout you need a new U-Boot and restore the default environment (once you have booted the new U-Boot).
Then, it is recommended that you erase the partitions prior to update again the system in the nand:

- Boot target with new U-Boot
=> env default -a
=> saveenv
=> mtdparts      (this only lists the new partition layout)
=> nand erase.part linux
=> nand erase.part recovery
=> nand erase.part rootfs

and then update the partitions with a new system.
Erasing the partitions is recommended to start with clean UBI metadata.