[Bug 270805] loader.efi: crashes with USB device attached

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270805

--- Comment #26 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #25)

Interestingly, using the adaptor to USB-C for plugging in
media after booting FreeBSD, I get different results on
different systems (the only FreeBSD USB-C contexts that I've
access to):

ThreadRipper 1950X:   media is detected.
Windows Dev Kit 2023: same media is not detected.

The ThreadRipper is a USB 3.1 context for the USB-C connector,
not a USB 3.2 context.

The WDK23 has its note about keyboards and mice via its USB-C
connector which may indicate something relevant.

The media here is a USB3.0 SSD.



As for having the USB-C connection present during boot loader
activity: that did not cause the loader any problems.

The only way that I've ever found to have a synchronous
exception during loader activity is from having plugged in
FreeBSD boot media with too old of a UEFI loader --and for
the UEFI to also have picked that media to get the UEFI
loader from. Then that loader leads to the synchronous
exception.

The UEFI does not give a way to explicitly pick which USB
device to boot from when more than one "bootable" USB media
is present. May be the port scan is in a fixed order or
some such. I've not tested for such.

Overall: I'm unable to reproduce the problem that was
reported.

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