No, it is not.  boot(8) has no knowledge of usb.

On 2018 Jun 15 (Fri) at 15:18:29 -0400 (-0400), Filippo Valsorda wrote:
:Is boot(8) on amd64 capable of using a ucom(4) device as a console for status 
and single user mode? I'd like to control the bootloader on a board without 
native serial ports.
:
:I tried "set tty ucom0" per FAQ 7 but it did not work.
:
:I suspect the answer is no, but looking for confirmation, or maybe workarounds 
I should know about.
:
:Thanks,
:Filippo
:
:(Please keep me in Cc.)
:

-- 
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