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Date: Sun, 7 Dec 2008 17:19:47 +0100
From: Marius Strobl <marius@alchemy.franken.de>
To: Hans Petter Selasky <hselasky@c2i.net>
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Cc: freebsd-current@freebsd.org, Alfred Perlstein <alfred@freebsd.org>,
	freebsd-usb@freebsd.org
Subject: Re: [Serious] busdma bug in -current in relation to USB hardware -
	review wanted
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On Sat, Dec 06, 2008 at 01:34:54PM +0100, Hans Petter Selasky wrote:
> Hi,
> 
> After various feedback from several people I have made a new patch proposal 
> that will fix the busdma problem.
> 
> See:
> 
> http://perforce.freebsd.org/chv.cgi?CH=154181
> 
> Review wanted!
> 
> I don't know how to patch the psyco interface for SUN. Maybe there is nothing 
> that needs to be patched?

Neither sparc64 nor sun4u has support for bounce buffers; it's
not really worth the effort to implement IOMMU-bypass and bounce
buffers for the few devices only doing < 32-bit DMA and for
>= 32-bit DMA the IOMMU takes care of the address translation
for all practical purposes. In any case this isn't specific to
psycho(4).

Marius