From owner-freebsd-hackers@FreeBSD.ORG Sun Sep 12 19:38:03 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 444AB16A4CE; Sun, 12 Sep 2004 19:38:03 +0000 (GMT) Received: from f20.mail.ru (f20.mail.ru [194.67.57.52]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0114B43D46; Sun, 12 Sep 2004 19:38:03 +0000 (GMT) (envelope-from shmukler@mail.ru) Received: from mail by f20.mail.ru with local id 1C6aAj-000O6U-00; Sun, 12 Sep 2004 23:38:01 +0400 Received: from [24.184.136.70] by msg.mail.ru with HTTP; Sun, 12 Sep 2004 23:38:01 +0400 From: Igor Shmukler To: David Leimbach Mime-Version: 1.0 X-Mailer: mPOP Web-Mail 2.19 X-Originating-IP: [24.184.136.70] Date: Sun, 12 Sep 2004 23:38:01 +0400 In-Reply-To: Content-Type: text/plain; charset=koi8-r Content-Transfer-Encoding: 8bit Message-Id: cc: freebsd-hackers@freebsd.org Subject: Re[4]: FreeBSD on Xserve? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: Igor Shmukler List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 12 Sep 2004 19:38:03 -0000 > > 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.