On Tuesday 22 August 2006 3:30 pm, Grahame Jordan wrote:
> Hi,
>
> I have developed a device using a Gumstix (PXA255). The USBnet works
> perfectly on Linux using CDC ethernet, however when it comes to running
> it on Windows (RNDIS) which unfortunately will be the main target it
> breaks really badly.
Which versions of Windows and Linux?
Not that I use Windows much, but the last few times I've tried that
combo there's been no particular issue. You might be missing a few
bugfixes though.
> It is clear that the RNDIS driver on Linux is incomplete because of the
> lack of definative documentation from Microsoft.
Interop with XP SP2 was OK last time I tested; older versions of
Windows had various oddities though. Last time I tested, even the
all-but-undocumented suspend/resume sequences behaved sanely.
But agreed ... I keep meaning to point this out to the EU as a
clear example of flawed documentation. Interop spects that stop
at even 90% coverage are broken.
> The device connects OK but after a short time it disconnects and in some
> cases the networking layer on Windows freezes until the USB cable is
> pulled out. Once the usb cable is put back in Widows reestablishes the
> connection for a short time and then does it again.
Never seen such failures (work for a while, then stop).
Windows freezing is by definition a bug in Microsoft code, but we
all know how unlikely bugfixes to that code are. :(
> I am a newbie when it comes to working on USB and know little about
> RNDIS but I am willing to troubleshoot this with a bit of guidance from
> the usb-devel team.
The obvious suggestions involve turning on debugging options when
building the drivers, and/or throwing some kind of USB sniffer at
the problem(*). The question of interest is what happened up to
and during that freeze.
- Dave
(*) For this purpose a totalphase.com "Beagle" should suffice;
the main problem I have with that is that it's rather eager
to garble the most interesting protocol interactions during
capture
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