Date: Tue, 19 Mar 2002 17:09:22 -0500 From: David Edelsohn <dje@watson.ibm.com> To: James Sarrett <James.Sarrett@asu.edu> Cc: obrien@FreeBSD.ORG, freebsd-ppc@FreeBSD.ORG Subject: Re: send-pr categories & FreeBSD/powerpc or -ppc Message-ID: <200203192209.RAA25870@makai.watson.ibm.com> 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>
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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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-ppc" in the body of the message
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