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In-Reply-To: Message from Bernd Walter <ticso@cicely12.cicely.de> 
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From: "Brian F. Feldman" <green@freebsd.org>
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Date: Fri, 21 Nov 2003 15:43:29 -0500
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cc: Josef Karthauser <joe@freebsd.org>
cc: Ian Dowse <iedowse@maths.tcd.ie>
cc: current@freebsd.org
Subject: Re: kernel panic trying to utilize a da(4)/umass(4) device with
	ohci(4) 
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Bernd Walter <ticso@cicely12.cicely.de> wrote:
> On Fri, Nov 21, 2003 at 12:35:50PM -0500, Brian F. Feldman wrote:
> > Doug White <dwhite@gumbysoft.com> wrote:
> > > The OHCI driver is largely synced with NetBSD so you might see if they
> > > have the same bug.
> > 
> > I'll look around for a bootable NetBSD CD.
> 
> NetBSD is different in that point.
> 
> > > This might be the underlying wierdness we were seeing in gtetlow's
> > > microdrive with transfers over 8k.  The one-page-crossing ohci limitation
> > > is really annoying.
> > 
> > Is there a way to add a quirk for max 8k transfers or anything?  Even though 
> > that would be patently lame, I'd like to get some sort of workaround here.  
> > I don't even know what is supposed to be the problem here -- the fact that 
> > it's an ohci controller, an ohci+ehci controller, or that it's some specific 
> > controller issue...
> 
> We never did any page crossing on ohci/ehci bevor the newbus change
> took place.

Are you hinting that I need to find some way to "defragment" the DMA buffers 
I'm getting back?

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\