Comment # 4 on bug 66932 from Alex Deucher

(In reply to comment #3)
> 
> Well I think I'm already building radeon as a module since I have:
> CONFIG_DRM=m
> CONFIG_DRM_RADEON=m
> 
> or am I missing something?

That should be fine.  I assumed you were building it in since you were messing
with CONFIG_EXTRA_FIRMWARE.