On Tue, Oct 21, 2025 at 09:22:15PM +0200, Jan Stary wrote:
> Hm. Just reinstalled from the very same usb stick.
> Now the same kernel (GENERIC.MP #62) boots fine; dmesg below.

In the original dmesg for bsd.rd you had an issue with a USB device:

> > uhub0: port 2, set config 0 at addr 2 failed
> > uhub0: device problem, disabling port 2

The latest dmesg for the working bsd.mp does not show any device connected to
port 2 of uhub0.

It's possible that the boots of bsd.rd and bsd.mp that hung were hanging due
to this device not responding, or doing something unusual to the USB bus.

Possible ideas:

* There never was a device connected to that port, but for some reason the
  controller thought that there was.  (If you subsequently power cycled the
  machine, that could have 'cleared' such a spurious problem)

* There is, (or was), a faulty device connected to that port which has now
  failed completely and is not being seen at all

Is there supposed to be a device connected there?  If you have usbdevs output
saved from an older OpenBSD installation, that might provide some clues.

(I know it's working now, but this seems like a problem that might come back
 at any point.)

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