Help Needed: Big Sur installed using opencore, platform panic when install Radeon Vega 64

[philb10]

I had a Catalina install working using clover. I broke clover when preparing for Big Sur, and have moved to opencore.

I have successfully upgraded my machine to Big Sur using opencore 0.7.6, following the vanilla guide. I had to remove my Vega to do this.

I have not worked on USB and audio yet, wanting to enable the Radeon Vega first.

Motherboard is an Asus ROG Hero IX based on Kaby Lake. Graphics card is a Sapphire Radeon Vega 64 Nitro+. I'm using iMac18,3.

When I physically install the Vega, the machine boots and I can start OSX, but the screen then shows rapid vertical lines and gives me the repeated error:

IOPlatformPanicAction->AppleAHCIDiskDriver before rebooting.

I've searched for similar issues and cannot see an obvious solution.

Would appreciate some help!

Phil B.

 

[P1LGRIM]

Please read and comply with the rules, in particular the one regarding profiles.

Link to profile - Just three items - Motherboard (or prebuilt system), Processor (CPU) and Graphics.