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Date: Fri, 14 Sep 2007 15:18:04 -0700
From: Andrew Sharp <andy.sharp@onstor.com>
To: "Brian Stark" <brian.stark@onstor.com>
Subject: Re: smells like hardware to me
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On Fri, 14 Sep 2007 09:45:17 -0700 "Brian Stark"
<brian.stark@onstor.com> wrote:

> Andy,
> 
> First, I just want to make sure you're not trying to access physical
> 0xc0000000.  This points to memory that isn't populated at this point.

Please.  Give me some credit.

> Since cksseg maps to 0, I don't think this is the case, but I thought
> I'd point it out.
> 
> To use cksseg, you have to set the SX bit in the Status register.  We
> can do this in the PROM if you want.  We typically have not used this
> space for addressing, so we do not enable it by default.  

This is the kernel doing all this, I'm just reporting the facts.  It
could be a kernel issue, but it doesn't seem likely based on current
evidence.  But I thought you guys could easily try it yourselves to see
if the same thing happens to you.

I would normally expect to get an exception of some sort if it was some
kind of paging error or address violation.  Instead the whole thing
just locks up.

> 
> 
> Brian
>  
> 
> > -----Original Message-----
> > From: Andy Sharp 
> > Sent: Thursday, September 13, 2007 9:35 PM
> > To: Brian Stark
> > Subject: smells like hardware to me
> > 
> > Hi Brian,
> > 
> > I think I may have bumped into a hardware-ish problem while 
> > trying to diagnose the module loading problem.  It seems that 
> > the system locks solid when it tries to access address 
> > 0xffffffffc0000000.
> > 
> > This should be standard CKSSEG space on mips64 so there 
> > shouldn't be a problem.  Is it possible that there is 
> > something we're not doing quite right when setting up the 
> > 1125 wrt all the mips64 segments and so on?
> > The kernel should be programming things as much as possible, 
> > but I'm wondering if there isn't something that has to be 
> > done in the setup stream or something like that.
> > 
> > Any of this ring any bells?  As always, an education is 
> > appreciated if warranted ~:^)
> > 
> > Cheers,
> > 
> > a
> > 
