[U-Boot] Passing bootargs to arm64 kernel

[Youngmin Nam]

Hello.
I'm trying to find a way how to pass bootargs to arm64 kernel.

In arm32 kernel, we can pass bootargs with atag from u-boot to kernel. So,
we can overwrite kernel's bootargs with u-boot's bootargs.

But from arm64 kernel, the dtb is the only argument that should be passed
from bootloader which is mandatory.
you can find this contents in kernel
documentation.(Documentation/arm64/Booting.txt)

So,  is there any way how to set bootargs by u-boot?

Thanks.