OI needs a KMS kernel module for Radeon video
All of my ryzen systems use Radeon video cards. I have to run them with the VESA driver, because OI does not have a KMS module for Radeon cards. Freebsd has two, "amdgpu" for newer AMD graphic cards, and "radeonkms" for older AMD/Radeon graphic cards. I expect I will need both because I have one ryzen system with Vega graphics built-in to the CPU.
I'm willing to help by testing both modules.