Well that is what i also am wondering 
The Omnia uses “mvebu” that is apparently a specifiek type of ARM-processor. Although i have also read somewhere before that the Omnia ARM-processor is a ARM-v7.
Well we can only know by trying right. If it does not work, then we know we were wrong 
EDIT2: I stumbled upon my other comment a couple of weeks back.
Turris Omnia CPU: Armada 385 = ARM7v
Raspberry Pi 3 CPU: ARM Cortex-A53 = ARM8v