Date: Mon, 13 Sep 2004 10:30:35 +0400 From: Igor Shmukler <shmukler@mail.ru> To: peterg@ptree32.com.au Cc: freebsd-hackers@freebsd.org Subject: Re[6]: FreeBSD on Xserve? Message-ID: <E1C6kMG-000FsK-00.shmukler-mail-ru@f27.mail.ru> In-Reply-To: <200409130607.AGL36193@dommail.onthenet.com.au>
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That's true indeed. Below is a quote from http://www-306.ibm.com/chips/techlib/techlib.nsf/techdocs/AB70A3470F9CC0E287256ECC006D6A54/$file/970-software.pdf The implementation of memory management in the 64-bit PowerPC processors is significantly different from the 32-bit PowerPC implementations. The support for BAT (Block Address Translation) is no longer available in the PowerPC 970FX processor and in the 64-bit PowerPC architecture. The removal of the BAT mechanism will require all application programs to enable the MMU (Memory Management Unit) in order to access non-cachable memory. It's very strange that original manual states quite the opposite. Igor. -----Original Message----- From: <peterg@ptree32.com.au> To: Igor Shmukler <shmukler@mail.ru> Date: Mon, 13 Sep 2004 16:07:45 +1000 Subject: Re: Re[4]: FreeBSD on Xserve ? > > >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. > > I think there's an IBM technote that states there are > no BATs on the 970. Linux source has comments to that > effect as well. > > And before I found that info, I tried in vain to get it > to work on my G5. > > later, > > Peter.
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