Subject: Graphics support (was Re: VaxStation 4000 model 60)
To: Boris Gjenero <bgjenero@undergrad.math.uwaterloo.ca>
From: Bertram Barth <bertram@ifib.uni-karlsruhe.de>
List: port-vax
Date: 01/12/1998 08:43:52
Boris Gjenero writes:
> I'm wondering... is there any reason why the graphics console isn't
> supported through the firmware?  Non-kernel based stuff (boot, edlabel,
> etc.) do use it that way.  Heck, even disk controllers can use the QDSS
> that way.

Firmware routines are only usable with MMU disabled. Thus they can be
used in standalone programs which use physical addresses anyway.
After kernel has enabled MMU and virtual addresses are used, the
ROM-routines in the firmware no longer work...

Ciao,
	bertram