I'm trying to get our HSA code running on a Haswell-E/Fury X machine using the ROCK kernel driver. The machine boots correctly using an upstream 4.4 kernel and amdgpu driver. It will also boot with the ROCK kernel and a R9 390 installed. Unfortunately, when I try to boot the machine with the combination of the ROCK kernel and the Fury X installed it deadlocks during boot. The final line of console output is: "fb: switching to amdgpudrmfb from EFI VGA"
Any hints on whats causing it to hang would be greatly appreciated.