AM335x MLO failed to boot

[Alexander Shiyan]

Hello.

I can't start the custom AM335x board after updating to version 2021.12.0.
Perhaps this is a consequence of the "devfs: Do not create overlapping
partitions" commit.

Here is a debug output:
Add partition nand0.MLO, device nand0 (0x00000000-0x00020000)
Add partition nand0.boot, device nand0 (0x00020000-0x00080000)
Add partition nand0.env, device nand0 (0x000a0000-0x00040000)
Add partition nand0.system, device nand0 (0x000e0000-0x0ff20000)
booting from NAND
Add partition x, device nand0 (0x00020000-0x00080000)
New partition x (0x00020000-0x0009ffff) on nand0.boot overlaps with
partition nand0.boot (0x00000000-0x0007ffff), not creating it
failed to open bbx
booting failed

What is the partition "x" in this case?
How to fix this?

Thanks!