Date: Tue, 1 Sep 1998 11:49:03 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: shimon@simon-shapiro.org Cc: freebsd-alpha@FreeBSD.ORG, Doug Rabson <dfr@nlsystems.com> Subject: Re: Alpha Install - oops! Message-ID: <13804.2770.473870.7600@grasshopper.cs.duke.edu> In-Reply-To: <XFMail.980831194751.shimon@simon-shapiro.org> References: <13802.61200.986416.952138@grasshopper.cs.duke.edu> <XFMail.980831194751.shimon@simon-shapiro.org>
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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. <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). Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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