From owner-freebsd-ppc  Tue Mar 19 14: 9:58 2002
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To: James Sarrett <James.Sarrett@asu.edu>
Cc: obrien@FreeBSD.ORG, freebsd-ppc@FreeBSD.ORG
Subject: Re: send-pr categories & FreeBSD/powerpc or -ppc 
In-Reply-To: Message from James Sarrett <James.Sarrett@asu.edu> 
   of "Tue, 19 Mar 2002 14:55:37 MST." <0BB6F3D3-3B84-11D6-87B5-003065FB9A8C@asu.edu> 
Date: Tue, 19 Mar 2002 17:09:22 -0500
From: David Edelsohn <dje@watson.ibm.com>
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>>>>> James Sarrett writes:

James> fwiw, a afaik, the POWER4 and other POWER chips aren't PPC chips, they 
James> have a different architecture, which is similar, but doesn't include all 
James> the idiosyncracies that mother motor imposed on the original PPC spec. 
James> OS/400, and OS/390 will run on POWER chips as well as PPC chips, but i 
James> don't think OS/390 wil run on PPC chips, although AIX has binary 
James> compat...

James> (if i'm wrong it won't be the first time, and i should hope not the 
James> last.)

	Sorry, you're wrong. :-)

	z/OS (aka OS/390) does not run on POWER or PowerPC.  OS/400 does
run on the PowerPC/AS architecture variant and its derivatives, including
the RS64 and Power4 chips.

	RS64, Power3 and Power4 are PowerPC chips.  The chips are 64-bit
and require a kernel which understand the 64-bit PowerPC architecture (the
kernel does not need to run in 64-bit mode), but otherwise are standard
PowerPC.  32-bit PowerPC Linux kernels run on those processors with a few
VM tweaks.

	Power4 does not provide 64-bit PowerPC bridge mode, which means
that BATs are not present and one cannot use the bridge mode segment
register instructions.  The kernel needs to operate on 64-bit PTEs, but
that is defined in the original, complete 64-bit PowerPC architecture.

David

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