Subject: Re: Zillion Digital Square driver
To: Jukka Marin <>
From: Lennart Augustsson <>
List: tech-kern
Date: 12/31/2003 16:08:24
Because when device manufacturers test their devices they do it
with windoze.  So they respond correctly if do exactly what windoze
does, but the USB spec often allows you to do things in a different
order, different timing, etc.
I've not looked at what XP does with a USB protocol analyzer (I did
it for -98), it might be time to do it again so NetBSD can mimic it.

	-- Lennart

Jukka Marin wrote:
> On Wed, Dec 31, 2003 at 03:24:00PM +0100, Lennart Augustsson wrote:
>>I don't really know.  There could be a problem with the ugen driver,
>>but there could also be a problem with the device.  I suspect that the
>>handling of the data toggle (the alternating-bit protocol) for bulk
>>transfers might be wrong.  A device bug in the handling of the data
>>toggle (e.g. not resetting according to the spec) could exhibit some
>>behaviour like this.
> Not related to this problem, but if the USB devices really are as buggy
> as described on the NetBSD lists, how come I can plug almost any USB
> gadget to an XP box and it Just Works (TM)?  I've got cameras, CF card
> readers, a DVcam etc. and they all work without special drivers.  How can
> bill gates write such drivers if real programmers can't?  Not trying to
> start a flame war, just curious..
>   -jm