Trimming the default /boot/device.hints

[M. Warner Losh]

In message: <200902061106.41235.jhb at freebsd.org>
            John Baldwin <jhb at freebsd.org> writes:
: On Friday 06 February 2009 10:22:35 am Andriy Gapon wrote:
: > on 06/02/2009 16:37 John Baldwin said the following:
: > > 
: > > Yes, it only needs the hint for it to be a console device.
: > > 
: > 
: > I am slightly confused as to how that hint works then, it's not like a
: > standard isa hint it seems.
: > Can it somehow be built-in (into the code)?
: 
: It works "normally" during the new-bus attach, but the low-level console code 
: probably checks for it early on as well.  The serial console code works that 
: way.  The uart(4) and sio(4) drivers explicitly look for uart/sio hints to 
: find possible console devices.  This is separate from when the ISA bus adds 
: uart/sio devices from the hints later on.

sio could be loaded as a driver, and still be the console driver.  But
it had to be loaded from /boot/loader.

Warner