ASRock x570 Phantom TB3-ITX and Linux - "No bus number available for hot-added bridge"

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Hi folks.

I just hit this issue as well running on the Asrock X570 Gaming ITX, BIOS 2.00, while trying to attach a device with a Thunderbolt 3 PCIe bridge chip inside and running Ubuntu 20.04, kernel 5.6.7.

I solved it by adding the following parameters to the kernel config in grub.

pci=realloc,assign-busses,hpbussize=0x33
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