Missing /dev/io on rpi3 running 12-stable

[bob prohaska]

Is there supposed to be a /dev/io by default in FreeBSD on a Pi3?
Attempts to start X under 12.1-STABLE r361271 GENERIC fail with
a report of "failed to open /dev/io". There is indeed no /dev/io,
but there's also no /dev/io on a pi2 running 12-stable. 

Nor does there seem to be  a kernel module with matching name....

Thanks for reading!

bob prohaska