board/MynaPlayer odyssey: add pre-init script to setup overlay filesystem.
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This adds a pre-init script that is ran before systemd. This scripts prepares the system so that the rootfs will be left unaltered, but combine it with a writable ext4 filesystem, where data can be stored into. Both rootfs use the same overlay, which makes it possible to preserve data while overriding the rootfs during an upgrade.
Xogium
committed
on 6 Sep 2020