On Sat, May 22, 2004 at 08:09:26AM -0700, Jason Thorpe wrote:
> 
> On May 22, 2004, at 7:19 AM, Manuel Bouyer wrote:
> 
> >No, atabus and umass are at the same level in the config herarchy.
> >Both offer a way to transfer data from/to a wd device, but do it in a 
> >different
> >way: atabus drive the wd device directly from its register, while
> >umass talks to a ata/usb bridge which hide the ATA registers from us.
> 
> FWIW, I have always disagreed with this approach.  I would prefer that 
> atabus by a common midlayer for all ATA controllers, the same way 
> scsibus is for SCSI controllers.


But umass isn't an ATA controller.
atabus provide methods for sending commands and transfering data to an
ATA device. umass provide others.
I don't see what another layer in the device tree would buy us, as 
there can be only one device (wd) attaching at thoses.

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--