Qemu and flattened device tree

I have a Bluetooth keyboard and mouse along with termux installed on my
phone. A qcow2 image of 15G has been created with a current download of
ppc64 14.2 as the test system. This is to start the brltty work before I am
able to start on real machines.
Will I need any open firmware downloads to run the machine
I am aware the emulated CPU needs to be a 970 with an average of 1.5G for
memory. The phone only has 4G, so the emulated ram will max out at 2G
without affecting performance.
Any information on this is appreciated.
Thank you.