On Sep 12, 2004, at 12:38 PM, Igor Shmukler wrote:
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.
I understand :). I am not able to confirm this information with anything technical as I haven't looked very hard or had the time to check into these issues.
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.
I agree. It's just the fans would likely be an issue for many users who have G5 desktops. An Xserve in a rack is probably allowed to be more noisy than other stuff.
And I hope that you are correct about the BAT registers :).
Dave
Igor.
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