How to use systemd in initramfs?

I'm using vocore2, I need fast boot, so how to include systemd in initramfs in generated image?

systemd isn't available at all for OpenWrt.

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ok, what is the other ways to improve fast loading or can you tell me how to have ramdisk image?

Initramfs images can be enabled at buildtime, I wouldn't expect those to boot much faster though (they are not meant to be used in production). Speed will be what it is, any improvements would come from case-by-case investigations and perf testing.

Discussion continues here How to have ramdisk image in openwrt