From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from www.linux.org.uk (parcelfarce.linux.theplanet.co.uk [195.92.249.252]) by dsl2.external.hp.com (Postfix) with ESMTP id 335A44852 for ; Thu, 2 Oct 2003 18:18:12 -0600 (MDT) Received: from willy by www.linux.org.uk with local (Exim 4.22) id 1A5De6-0000XY-Vo; Fri, 03 Oct 2003 01:18:10 +0100 Date: Fri, 3 Oct 2003 01:18:10 +0100 From: Matthew Wilcox To: Derek Engelhaupt Cc: Joel Soete , parisc-linux@lists.parisc-linux.org Subject: Re: [parisc-linux] L2000/N4000 smp devices/boot compare?? Message-ID: <20031003001810.GH24824@parcelfarce.linux.theplanet.co.uk> References: <3F5CB6FB0000C2D7@ocpmta1.freegates.net> <20031002233801.23113.qmail@web12508.mail.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20031002233801.23113.qmail@web12508.mail.yahoo.com> Sender: parisc-linux-admin@lists.parisc-linux.org Errors-To: parisc-linux-admin@lists.parisc-linux.org List-Help: List-Post: List-Subscribe: , List-Id: parisc-linux developers list List-Unsubscribe: , List-Archive: [Derek, could you possibly wrap your mails around 70 columns? It's hard to read/reply to your mails.] On Thu, Oct 02, 2003 at 04:38:01PM -0700, Derek Engelhaupt wrote: > First off, since the N, L, and A class are of the same generation > of machines they are similar in some respects. Different in others. > The L1000 and L2000 have a system card unique to that set of machines. > Being that as it is, the L1000/2000 probably use a different I/O > interface chip. The L1500 and L3000 are in essence an N Class system > card cut in half and therefore use the same I/O interface as the N. > The GSP in the L Class resides in the PCI card cage with the GSP in the > N Class is a seperate card attaching directly to the system card via the > hot swap disk backplane. The extra unknown system buses probably reside > on the GSP of the N Class. That would be my educated guess of what the > unknown system buses are. The N has two IKEs since it has both a left > and a right PCI card cage attached directly to the system board. According to the IO-ACD, these are actually the processors: Prelude W+ 540 | NPROC | 00004 91 | 5D3 A500/L1000/L2000 use Astro/Elroy just like the B/C/J class. L1500/L3000/N use Ike and Stretch in place of Astro. I once downloaded an N-class PDF which I've subsequently lost. If I remember correctly, it looked like: CPU --+-- CPU RAM CPU --+-- CPU DEW ||||| DEW +--------+--------+---- Stretch ----+--------+------+ IKE DEW DEW IKE ||||| CPU --+-- CPU CPU --+-- CPU ||||| Ropes Ropes (Elroys on the end of the ropes, of course). My understanding is that Stretch is the problem. We don't follow the rules for non-coherent aliases and Stretch isn't as lenient as other memory controllers. -- "It's not Hollywood. War is real, war is primarily not about defeat or victory, it is about death. I've seen thousands and thousands of dead bodies. Do you think I want to have an academic debate on this subject?" -- Robert Fisk