Greetings, fellow necromancers! I need your help as this computer is going to drive me crazy.
I have a Mac Pro 5,1 with EnableGOP and a reference RX 6900 XT with the syncretic patch flashed. Also I have installed an NVME adapter and a USB 3.1 card.
The problem is I can not boot any version of macOS. I have already tried Sequoia, Sonoma, Ventura and even Monterey - they all install Success fully but I get a black screen on boot. If I use RX 560 everything goes fine. I know about the "agdpmod=pikera" boot arg, I also tried "disable" and "ignore" - still nothing but a black screen. Tried asking ChatGPT and followed it's advices - i tried different combinations of boot-args and quirks, but nothing helps.
Lilu and WhateverGreen are installed by OCLP by default and load Success fully with RX 560.
So, I will be grateful for any advice on installing an OS on my elderly Mac.
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