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Date: Sun, 20 Apr 2003 17:57:47 -0400
From: Jake Burkholder <jake@locore.ca>
To: ticso@cicely.de
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cc: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
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Subject: Re: cvs commit: src/sys/conf NOTES files src/sys/dev/usb FILES
	ehci.c         ehci_pci.c ehcireg.h ehcivar.h usb.c
	src/sys/modules/usb Makefile
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Apparently, On Sun, Apr 20, 2003 at 11:35:38PM +0200,
	Bernd Walter said words to the effect of;

> On Sun, Apr 20, 2003 at 04:25:28PM -0400, Jake Burkholder wrote:
> > Apparently, On Wed, Apr 16, 2003 at 12:15:47PM +0200,
> > 	Bernd Walter said words to the effect of;
> > > On Wed, Apr 16, 2003 at 11:23:30AM +0900, Hidetoshi Shimokawa wrote:
> > > > At Mon, 14 Apr 2003 07:04:08 -0700 (PDT),
> > > > Bernd Walter wrote:
> > > > Is this device supposed to work on sparc64?
> > > 
> > > I don't know a reason why not.
> > 
> > I don't know if this device is an exception, but the USB framework in
> > general does not use busdma, so its not MI and won't work on sparc64.
> 
> This device is not an exception - it wouldn't make much sense without
> doing OHCI first as both are very similar in design.
> joe said he would do busdma for OHCI, but I'm not shure if the porting
> just stalled.
> Is busdma realy an absolute required feature for sparc64?

Yes it is, and it should be for alpha.  alpha works because of this
hack:

#ifdef __alpha__
#define DMAADDR(dma, o) (alpha_XXX_dmamap((vm_offset_t) *(dma) + (o)))
#else
#define DMAADDR(dma, o) (vtophys(*(dma) + (o)))
#endif

But as a result alpha can only support limited amounts of physical memory
(1 or 2G max depending on the system I think).

Jake