New kernel

Hi all,
I update kernel to 4.6. After this, i change initram script - overlayfs to overlay with workdir option.
System can boot, install and work. But i little confused.
How to mount config.boot from image?
In /live/image/boot/…/live-rw i have right config file, but in /opt/vyatta/etc/config i have another file.
Any help please)