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I recently built a workstation and am running into issues getting Linux to boot. After a lot of trial and error (because mostly the behavior I see is indefinite hangs) I think I've narrowed the issue down to the USB enumeration.

If I am able to boot to Linux, is there a way to discern which USB hubs are internal (to the South Bridge) and which are external on the motherboard?

I am trying to determine if (1) what my options are for fixing the issue and (2) if I should either consider RMAing my SoC (AMD 5975WX) or my motherboard (Asus WRX80E-SAGE SE WIFI II).

Surely there is some characteristic of PCIe hierarchy that makes the distinction clear?

What I am able to see from the Linux early boot is

xhci_hcd 0000:23:00.0: init 0000:23:00.0 fail, -16
xhci_hcd 0000:2a:00.1: init 0000:2a:00.1 fail, -16
xhci_hcd 0000:2a:00.3: init 0000:2a:00.3 fail, -16

16 is EBUSY, which sounds like an interesting failure mode. Using this PCI bus enumeration can the origin of the failure be known?

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All your USB ports are handled through the WRX80 chipset. If your USB troubles are hardware-related, it’s more likely a motherboard problem than a CPU problem.

(Your CPU isn’t an SoC.)

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  • I suppose maybe pedantically it's not a completely self-contained system. Although I perhaps misspoke by categorizing something that is "more than a processor" but also "less than a complete system" as a SoC.
    – sherrellbc
    Commented Jun 17 at 18:02
  • The main consideration here is that it doesn’t have a USB controller; that’s all on the motherboard.
    – Stephen Kitt
    Commented Jun 17 at 18:14

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