Excuse me infinisil. Looking back this a bad question. I am trying to update amdgpu-pro to its 20.20 version. In that process, one of the prebuild script does the following : 
```shell
FW_DIR="/lib/firmware/$KERNELVER"
mkdir -p $FW_DIR
cp -ar /usr/src/amdgpu-5.6.0.15-1098277/firmware/amdgpu $FW_DIR
```