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

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

--- Comment #20 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Robert Clausecker from comment #0)

Ultimately, using main [so: 14], I've  not been able to
reproduce any "after displaying the beastie menu" crashes
based on USB storage having been connected during the
boot. USB3.2 and USB3.0 devices. I cover 3 of the 4
combinations relative to port types for my test context:

USB3.2 in USB-C port (no "umass0" or no "umass1" or . . .)
USB3.2 in USB-A port (works)
USB3.0 in USB-A port (works)

Unfortunately, I do not have a way to form a
USB3.0/USB-C combination.

The USB3.2 in USB-C port case has differing consequences
for boot media (no root mount or the like) vs. having the
same result as not plugging the drive into a port at
all: not detected.

(In my context, the FreeBSD boot media is always a
"umass*".)

I no longer maintain an environment for building stable/*
or releng/* variants. So it may be a main vs. releng
distinction compared to your results. I've not checked.

I'll also note that I do not have access to a variety of
media of the types listed. It could be some other distinction
is involved that happens to correlate with USB3.2 in my
context and that some other USB3.2 storage media would work.
I've no way to know from what I've available to test.

(Of course, a bunch of my comments ended up being the process
of figuring my own operator error: All those reporting a
Synchronous Exception.)

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