Initial boot from USB stuck on "using 16384 buffer headers..."

https://imgur.com/gallery/nKca1eK

I get this error when I try to boot from Clover USB. I've seen other people have this problem and many posts have some references to beast tools, which I'm not using.

Earlier it was stuck on the " [ PCI Configuration end..." step (6th line from bottom in picture), but fiddling around with different boot args seems to have changed this (?). Boot arguments are all default right now but I've tried using different combinations of PCIRoot=0, PCIRootUID=0, ncpi=0x2000, and ncpi=0x3000, and all either result in being stuck at this step or the PCI Configuration end step.

Relevant hardware:

CPU: i5-9400F (no integrated graphics, using iMacPro1,1 SMBIOS)

Motherboard: Gigabtye B365M DS3H motherboard

GPU: Sapphire Pulse RX580

How should I proceed? Any help is appreciated! Let me know if I can clarify anything.

submitted by /u/arjankahlon
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