OC0.7.0/11.4/6800xt crash during boot

I just switched my Radeon VII for a 6800XT, having got OC0.7.0 working fine with OS X 11.4 and 11.5 Beta. If I boot under either Win10 or ubuntu, everything works fine. Under OS X, I get through the OpenCanopy picker, get the Apple boot logo, then it just crashes back to initial UEFI boot.

Obviously to do with the switch of graphic cards - I'd pre-added agdpmod=pikera to boot-args - am I missing anything else?

Asrock X570 Taichi/AMD 3900X/Sapphire 6800XT

TIA…

submitted by /u/Technomad42
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