xhci(4) hanging in early boot with drives attached

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From: Sean Bruno <sbruno_at_freebsd.org>
Date: Sat, 02 Apr 2022 17:15:05 UTC

As far as I can tell, xhci(4) is hanging on "something" during early 
boot (probably something uninitialized) that causes it to basically 
never attach drives.

I only have one controller here, so it could be something special with 
my device.

If I single user my machine and attach my storage array, probe/attach 
works just fine.  Leaving the USB3 array attached during a full boot 
causes xhci(4) to become completely unresponsive and requires a reboot 
to resolve.

I probably need someone who understand the early bits well enough to 
know what things a driver can/cannot do prior to single-user mode.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261912

sean