> Umm, well, I would suggest not even bothering with a table. You should be able
> to size the video ram and other stuff like the ROMs pretty easily using one
> routine.

Maybe...  This doesn't always work for real RAM--unless I was imagining
things a while ago on the II, memory wraps around in wierd ways so that
there are few memory locations that actually return a bus error with
translation disabled (MMU off).  It's been a while and I don't remember
the details, but that's why the memory size is passed in from the booter.

> What you do is tell the NetBSD bus error handler that you're probing and then
> setjmp to your own handler routine. Here's some pseudocode:

There is actually already a routine for this--bad_baddr(), I think--in
machdep.c.  It encapsulates the setjmp for you and returns 0 if the
address is mapped and non-zero if it's not.

-allen

-- 
              Allen Briggs - end killing - briggs@macbsd.com