Re: Kernel panic on amd64Netbsd 4.0

Manuel Bouyer <[email protected]> Thu, 25 Sep 2008 23:50:33 +0200

Newsgroups	gmane.os.netbsd.ports.x86-64,gmane.os.netbsd.general,gmane.os.netbsd.help
Message-ID	<[email protected]>

On Thu, Sep 25, 2008 at 02:46:06PM -0700, Paul Goyette wrote:
> >at last for i386; never tested it on amd64.
> 
> I use
> 
> 	options         PHYSMEM_MAX_ADDR=4096
> 
> on my amd64 with k8GB and it avoids numerous random crashed that I'd 
> been having.
> 
> I was told at one point that there was a problem with bounce buffers 
> over the 4GB limit, but then was told that that problem didn't exist. 
> So, I'm not sure what the actual problem is, but limiting to 4GB does 
> avoid the crashing.

There are no general issues with bounce buffers, AFAIK. But there
may be issues with individual drivers not doing the bus_dma(9)
thing properly.

-- 
Manuel Bouyer <[email protected]>
     NetBSD: 26 ans d'experience feront toujours la difference
--