Creating vyos filesystem from boot

What are steps to mount vyos filesystem during boot? I mean all those mountpoints and overlays. It appears there are some init scripts somewhere during boot? Fstab is not the place. Maybe some code in initrd?
I want to understand all those steps to reproduce on embeded linux and launch on development board with U-boot . Any help appreciated.

Hi mmxland,
I recently went looking for that information, and posted my findings on this forum here.

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Great. Thanks a lot. I will look into it!