ddk

Finally Here we got it 11.4 Beta 1 has RDNA 2 drivers https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11_4-beta-release-notes

Hello @Sakeador Thanks for sharing your test. The problem was I was using RX 6900 XT only to boot Big Sur 11.3 but it solved when I inserted supported GPU Radeon Pro WX 5100 along with RX 6900 . It is weird that some Unsupported GPU can boot but others not.

Thanks for your help appreciated . you mean my trx40 bios need patch ? I can try that if possible how can I do that?. I ordered Gigabyte GC-Titan Ridge Card and the programmer but according to ameyrupji Catalina 10.15.3 latest supported I'm afraid. and the GC-Titan Ridge must be on PCIe slut 1 can't be on slut 3/4 for reasons .

is there another way without patch for OSX?

no I don't think so , can I patch it how ? but I tested it on windows error "Thunderbolt device functionality might be limited" no gpu detected but only usb

Weird, Im getting message Thunderbolt accessories are not supported on this Mac I changed the bios from iMacPro to iMAC 19 same message

Tomorrow I will receive "Sonnet eGPU Breakaway Puck Radeon RX 5700" Is there any special setup in opencore except for bootArguments agdpmod=pikera and disabling Internal GPU RX 6900 XT ? Is the EGPU may solve my booting problem on 11.3 beta ?

the one of @Arrakis's works for me on 11.2.1 and a bit faster , I didn't test on 11.3 ignoring for now. I will test the one you sent me and let you know how it goes. reduced-config.zip

Thanks but I with reduced patches Kernel Panic on both 11.2.1 and 11.3 beta 2 don't you think this is weird?

Yes I have only gpu rx 6900 xt, I think this is the problem . I will wait for the next supported beta then. Thanks for your help.

I had to apply AMD_Vanilla patch to avoid kernel panic result: same issue I think AMD_Vanilla patch should make a new patch for Zenith II MB.

I was using MMIO from my own debug since the beginning. Anyway I moved MMIO to the new EFI plist that you gave me. result unfortunately Kernel panic

The second screenshot above is after disabling XhciPortLimit

stuck on same position after disabling XhciPortLimit and Pat

this is After installing 11.3 beta 2 update, and even boot from recovery environments not possible boot stuck. how long does it takes I waited 6 hours. screenshot after disabling fix Pat