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Reply-To: shimon@simon-shapiro.org
Organization: The Simon Shapiro Foundation
From: Simon Shapiro <shimon@simon-shapiro.org>
To: Doug Rabson <dfr@nlsystems.com>
Subject: Re: Alpha/PCI Help Request
Cc: freebsd-alpha@FreeBSD.ORG, Mark Salyzyn <salyzyn_mark@dpt.com>
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Doug Rabson, On 28-Jan-99 you wrote:

...

> > *  The PCI probe banner announces that the card is on int a, irq 0. 
> > this
> >    does not look good to me.  I have no idea how to set the IRQ, other
> >    than
> >    what is done already in the driver (sys/pci/dpt_pci.c, and
> >    sys/dev/dpt/dpt_scsi.c)
>  
>  This is quite normal for a 164LX based system.

Good. One potential source of headache gone...

...

> > 
> >       halted CPU 0
> > 
> >       halt code = 7
> >       machine check while in PAL mode
> >       PC = 18400
> >       boot failure
> >       >>>
> > 
> > *  Obviously the driver works under IA (i386), or I could not type this
> >    message :-)
> > 
> > If this rings a bell, please let me know.  I will try, in the meantime
> > to
> > isolate the exact line of code that blows up (1C resolution), and post
> > some
> > more information.
>  
>  This kind of error sometimes happens when accesses are made to i/o
>  memory
>  which isn't backed by a real device.  The way I usually debug this is to
>  single step the code until I find exactly what the bogus address was. 
>  The
>  answer is often obvious at that point.  Are you using kernel-gdb for
>  this?
>  It makes this stuff a *lot* easier.

This is the game plan...  thanx!

Simon


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