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From: John Baldwin <jhb@FreeBSD.org>
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Date: Tue, 2 Aug 2005 14:21:17 -0400
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Subject: Re: KZPCC-CE SCSI controller
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On Tuesday 02 August 2005 01:23 pm, David O'Brien wrote:
> On Mon, Aug 01, 2005 at 05:15:01PM +0200, Wilko Bulte wrote:
> > Yes, asr(4) is not in the default Alpha kernels.
>
> ..
>
> > Would be interesting to know if it works or not, then we can go and
> > add it into the default GENERIC for FreeBSD/alpha install cds.
>
> It will not work as-is.  I suspect it could be made to work using the
> ugly hack we have elsewhere in src/sys:
>
> #ifdef __alpha__
> #undef vtophys
> #define vtophys(va)     alpha_XXX_dmamap((vm_offset_t)va)

It needs more work than that.  It embeds 32-bit KVA pointers as cookies into 
it's DMA descriptors or some such.  Talk to Scott if you want more details.

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org