Ken Nakata wrote:
> 
> On Wed, 22 Jul 98 4:08:12 EDT, I-Jong Lin wrote:
> >
> > 1.  When the code hits the start symbol, does logical 0 = physical 0
> >     as far as memory locations are concerned?  If it doesn't, how
> >     can I assure that a mapping like this exists temporarily?
> 
> If you boot NetBSD with MacOS Virtual Memory turned OFF (which is
> requred), virtual == physical for all addresses, I think.
> 

I'm not too sure about the IIcx, but on the IIsi this is definitely not
true - which is (I think) the main reason my DayStar 040 doesn't work.
AFAICT, virtual 0 = physical 0x4000000, or maybe it's 0x50000. It's been
a while since I looked at it.

BTW, does anyone know how to translate a PHYSICAL address into a LOGICAL
address under MacOS? I'm trying to read the page tables under MacOS,
but given the physical address in the SRP, I'm lost as to how I can find
it's logical location.

Cheers,
-- 
Paul Ripke
BHP Information Technology
Open VMS, AXP & UNIX (AIX, HP/UX, DG/UX, SCO, SGI, Digital, SunOS...) Sysadmin
Computer Centre,    Five Islands Rd,    Port Kembla,    NSW 2505,    AUSTRALIA
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