How to copy multiple DTB files via U-boot

Technical Support
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Colibri iMX6ULL has a NAND chip for storage and utilize a UBI/UBIFS.
UBI volume has a several partition :
0 - For storing Linux Kernel
1 - For storing DTB
3 - For Root FS

You can check it by using command:
#cat /sys/class/ubi/ubi0/ubi0_1/name
dtb

or
#ubinfo -a

Linux Kernel and DTB partitions have no file system. So dtb stored as binary started with begging of partition.
U boot load DTB to specific address using command
ubi read ${fdt_addr_r} dtb

So you can’t store multiple DTB using different file names.
However DTB partition has a 248 KiB size while single DTB is around 40KB. So you can store multiple dtb using different offset.