From owner-freebsd-alpha Tue Sep 1 08:50:20 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id IAA29161 for freebsd-alpha-outgoing; Tue, 1 Sep 1998 08:50:20 -0700 (PDT) (envelope-from owner-freebsd-alpha@FreeBSD.ORG) Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id IAA29149 for ; Tue, 1 Sep 1998 08:50:16 -0700 (PDT) (envelope-from gallatin@duke.cs.duke.edu) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.8.5/8.8.5) with ESMTP id LAA12014; Tue, 1 Sep 1998 11:49:08 -0400 (EDT) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.8.8/8.8.8) id LAA22485; Tue, 1 Sep 1998 11:49:04 -0400 (EDT) (envelope-from gallatin) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Tue, 1 Sep 1998 11:49:03 -0400 (EDT) To: shimon@simon-shapiro.org Cc: freebsd-alpha@FreeBSD.ORG, Doug Rabson Subject: Re: Alpha Install - oops! In-Reply-To: References: <13802.61200.986416.952138@grasshopper.cs.duke.edu> X-Mailer: VM 6.43 under 20.4 "Emerald" XEmacs Lucid Message-ID: <13804.2770.473870.7600@grasshopper.cs.duke.edu> Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Simon Shapiro writes: > > Andrew Gallatin, On 31-Aug-98 you wrote: > > > I think you may have more luck if you power-cycle the box. When I've > > seen this under NetBSD/alpha, I suspected it was caused by the IDE > > controller acting as a noise generator, and was able to cure it by > > disabling the ide controller. > > How? > > (I think there is a problem we may want to solve here, still) > > ... Under NetBSD, simply leaving all references to the ide controller out of the config file did the trick. Under NetBSD, the ide controller got sort of half-attached -- enough for the isa irq to be enabled, but no devices on the controller were successfully attached. Doug - Does the ISA code disable all/most interrupts at boot time, or does it leave things as it found them? I'm worried the console firmware might be leaving the ide ISA irq enabled on Simon's machine. > > Wow! Yeah. Tell me about it. There's another variable I forgot to mention called dma_prefetch. On a MiataGL you want this on. It increases the DMA read b/w from ~70MB/sec to ~103MB/sec (for 8k transfers). (We currently turn this off in cia.c for non-GL miatas, but never turn it on). Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message