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Date: Fri, 04 Oct 2002 19:00:53 -0700 (PDT)
Message-Id: <20021004.190053.69975722.davem@redhat.com>
To: torvalds@transmeta.com
Cc: viro@math.psu.edu, linux-kernel@vger.kernel.org
Subject: Re: oops in bk pull (oct 03)
From: "David S. Miller" <davem@redhat.com>
In-Reply-To: <Pine.LNX.4.44.0210041839430.13749-100000@home.transmeta.com>
References: <20021004.181311.31550114.davem@redhat.com>
	<Pine.LNX.4.44.0210041839430.13749-100000@home.transmeta.com>
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   From: Linus Torvalds <torvalds@transmeta.com>
   Date: Fri, 4 Oct 2002 18:41:25 -0700 (PDT)
   
   On Fri, 4 Oct 2002, David S. Miller wrote:
   > Another theory is that some device just dislikes being given
   > a 0 in one of it's base registers, but somehow ~0 is ok :-)
   
   I think that is the real issue. We're mapping something - probably a host
   bridge - at address 0, and then accessing RAM (which is also is mapped at 
   PCI address 0) and the host bridge is unhappy.

We're current blindly putting ~0 in there, how can that be any
better? :-)
   
   So excluding the change is probably the right thing to do - it's just 
   fundamentally buggy to blindly put a base register at zero.
   
And putting ~0 there is ok?

>From what you're saying, that whole routine is fundamentally broken.
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