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Reply-To: shimon@simon-shapiro.org
Organization: The Simon Shapiro Foundation
From: Simon Shapiro <shimon@simon-shapiro.org>
To: Andrew Gallatin <gallatin@cs.duke.edu>
Subject: Re: Alpha Install - oops!
Cc: Doug Rabson <dfr@nlsystems.com>, freebsd-alpha@FreeBSD.ORG
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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


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