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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Wed, 23 Apr 2008 19:31:59 +0200
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Cc: Geoffrey Mainland <mainland@eecs.harvard.edu>, freebsd-embedded@freebsd.org
Subject: Re: Soekris 4826 USB failure on FreeBSD 7.0
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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