This plugin allows Binary Ninja to take advantage of radare2's linear sweep (which Binja currently does not offer).
Usually this will identify several functions that were missed by Binja.
sudo pip install r2pipe
cd ~/.binaryninja/plugins
git clone https://github.com/Manouchehri/binaryninja-radare2 binaryninja_radare2
echo "import binaryninja_radare2" >> ~/.binaryninja/plugins/wrapper.py