FreeBSD on Xserve?
shmukler at mail.ru
Sun Sep 12 23:30:39 PDT 2004
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.
From: <peterg at ptree32.com.au>
To: Igor Shmukler <shmukler at mail.ru>
Date: Mon, 13 Sep 2004 16:07:45 +1000
Subject: Re: Re: 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.
More information about the freebsd-hackers