Date: Tue, 01 Sep 1998 17:05:57 -0400 (EDT) From: Simon Shapiro <shimon@simon-shapiro.org> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: Doug Rabson <dfr@nlsystems.com>, freebsd-alpha@FreeBSD.ORG Subject: Re: Alpha Install - oops! Message-ID: <XFMail.980901170557.shimon@simon-shapiro.org> In-Reply-To: <13804.2770.473870.7600@grasshopper.cs.duke.edu>
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Andrew Gallatin, On 01-Sep-98 you wrote: > > 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. This should not be the case here, as there is a CD drive attached to the IDE channel 9one of them, at least. I could plug in an IDE hard drive. HAve one rolling in the cabinet. > 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. Is this like IRQ15 on Intel machines? spurious, and all? > <miata brain dump deleted> > > > > 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). I am still amused by computers that have DMA and I/O capacity at 20% of what it needs to be. Simon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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