HEAD UP: non-MPSAFE network drivers to be disabled

[Bruce M. Simpson]

Julian Elischer wrote:
>
> While this is a good idea on it's own, the difference between
> what that achieves and what a line discipline achieves is that
> a line disciplin is hardware independent and can even be used
> on a virtual device.
I was under the impression that the back-end for UART was light weight 
enough that it could be used as a virtual device.

For example: Many years ago I tried to get the WinModem working in my 
IBM ThinkPad T23. UART lends itself well to being a wrapper for the DSP 
microcode without having any of the historical tty baggage.

In the case of UART the "translation shim" moves from on top of the 
device node to underneath, in much the same way as has happened for GEOM.