RX 580 not booting on vanilla Ryzentosh (even with WhateverGreen)

More details on what I tried already here: https://forum.amd-osx.com/viewtopic.php?f=55&t=8851

So I first successfully installed without problems macOS 10.14.5 on my pc - well almost without problems, except for the vram bug where the screen goes all glitchy on a GTX 660.

I finally decided to get a new gpu and got a 580 8GB (I finally got to play NieR Automata!) all hyped for native support on macOS... Except it doesn't boot, despite using WhateverGreen and Lilu. The verbose boot gets stuck every time on a different line out of a couple ones, most of the times it's [ PCI configuration begin ] or HPET map device registers failed.

This happens both if I try to boot the installer or the OS.

Any help? I can post my full config if needed (it's also in my signature on AMD-OSX). Thanks a lot in advance!

submitted by /u/glics
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