Date: Sun, 12 Sep 2004 23:38:01 +0400 From: Igor Shmukler <shmukler@mail.ru> To: David Leimbach <leimy2k@mac.com> Cc: freebsd-hackers@freebsd.org Subject: Re[4]: FreeBSD on Xserve? Message-ID: <E1C6aAj-000O6U-00.shmukler-mail-ru@f20.mail.ru> In-Reply-To: <D681C145-04E7-11D9-8975-000A95AFBEB4@mac.com>
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> > Why do you think that 970 does not have BAT registers? > > There are 16 special purpose registers specifically to implement Block > > Address Translation. > > > > Because Peter already told us that they have no BAT registers: > > http://lists.freebsd.org/pipermail/freebsd-ppc/2004-February/000359.html I don't know what Peter said, but I do have documentation in front of me. In 7.4 of Programming Environments Manual we have an overview of BAT including BAT array organization. This comes as a shock to me. I am sending carbon copy to Peter Grehan, perhaps he could tell us where he got his information. I am not trying to suggest that you and/or him are wrong, but I cannot find (in manual) anything that would support your position that 970 has no block address translation. Regarding 16MB superpages, I believe manual explicitly says that 970 has no superpages, but I did not go through the doc again. Therefore, I could be mistaken. Regarding fans, it's not a big deal to support this kind of equipment. IMO, SMP support and other low-level stuff is order[s] of magnitude more complex. Igor.
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