[RFC] [PATCH] usbatm.[ch]: multiple changes

Roman Kagan rkagan at mail.ru
Wed Apr 6 15:04:51 EDT 2005

On Wed, Apr 06, 2005 at 06:54:42PM +0200, matthieu castet wrote:
> >Hmm, neither the forum nor the mailing list archive at eagle-usb.org
> >seems to mention anybody having babble problem in bulk mode.
> That easy, try to find people that have bulk mode working ;)
> The mode is choosen at compilation time, and iso is the default one, do 
> you expect users to recompile their driver and if so to change the 
> default configuration ?
> For the people who have choosen the bulk mode, how many have a high rate 
> connection ?

I have nothing against using iso mode (especially after I included it in
the patch I'm trying to push :).  But I suspect that misbehavior in bulk
mode and iso mode may be due to a common cause, and this cause should
better be narrowed down.

> So I believe this 2 problem are linked to the modem and they were masked 
> by the adi driver.

May well be, but since we're about to put a device-specific workaround
into the generic core, we'd better know for certain.  E.g. if this turns
out to be a hcd problem like the one Duncan mentioned, we're better off
making this a case for hcd maintainers.  If the modem can be proven to
be non-conforming, we can make it a case for ADI so that they put a
workaround into firmware if possible (I understand they are cooperating,
aren't they?).

> I will also try the windows driver 
> and see if it produce errors in bulk mode.

If you have access to windows installation, you can try using USB
sniffer by Benoît Papillault:


It proved very useful to me when I coded cxacru.


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