From owner-freebsd-embedded@FreeBSD.ORG  Thu Apr 24 03:34:56 2008
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Date: Wed, 23 Apr 2008 23:34:52 -0400
From: Geoffrey Mainland <mainland@eecs.harvard.edu>
To: Hans Petter Selasky <hselasky@c2i.net>
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Cc: freebsd-usb@freebsd.org, freebsd-embedded@freebsd.org
Subject: Re: Soekris 4826 USB failure on FreeBSD 7.0
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On Wed, Apr 23, 2008 at 07:31:59PM +0200, Hans Petter Selasky wrote:
> On Tuesday 22 April 2008, Geoffrey Mainland wrote:
> > Wow, this turns out to be much worse than I thought...I've tracked down
> > the problem to the commit of the new physical memory allocator at Sat
> > Jun 16 04:57:05 2007 UTC. Before that, no kern/122380; after that,
> > kern/122380 applies. Any ideas where to go from here?
> >
> 
> Hi,
> 
> I've sometimes seen that the USB HC's do not always support 32 address lines. 
> Not sure if that is the case for you. Then all DMA memory has to be allocated 
> at a lower physical memory address. You can easily check this by changing the 
> parameters used when creating DMA tags in the USB code.
> 
> --HPS

The new page allocator obviously tickled a bug somewhere in the current
USB stack, but I'm happy to report that replacing it with the USB stack
from your subversion repository fixed everything. Thank you! This fix
has allowed me to move a large wireless testbed forward to FreeBSD 7.

Geoff