> -----Original Message-----
> From: Timothy Desrochers [mailto:email@hidden]
> Sent: Friday, January 31, 2003 1:49 PM
> To: 'Fred Ross-Perry'
> Subject: RE: EZ-USB and OS X Restart
>
>
> We have a EZ-USB-based device and do not experience this problem.
>
> We use two different product IDs for the unloaded and loaded
> states of the device. If the device is plugged in on OS 9,
> the driver loads once for the unloaded device downloads
> firmware, and tells the device to re-numerate itself (the
> EZ-USB can do this). The driver unloads when the device
> "disconnects" and re-loads for the re-numerated new device
> "connection".
>
> If you re-boot to OS X, the driver unloads for the OS 9
> shutdown but the device remains on and in its "loaded"
> persona. Our OS X user-land code finds it just fine.
>
> The same is true on the OS X-9 transition.
>
> Is Classic perhaps getting in the way of your OS-X user-land
> code? We use a KEXT to prevent classic access to our device
> from OS X. We also open our device with the "seize" option to
> ask anyone else who might have it open to release it.
>
> >
> >
> > I have a device based on EZ-USB for which I have written a
> > user-land driver, which works fine.
> >
> > The driver downloads firmware and re-enumerates when it sees
> > the unloaded device.
> >
> >
> >
> > We also have a driver for OS 9, which might be installed on
> > the same machine. This driver uses
> >
> > a different version of the firmware.
> >
> >
> >
> > Runtime conflicts between the two drivers is NOT the problem
> > I am having.
> >
> >
> >
> > Here is the problem. User boots OS 9, plugs in the device,
> > all is fine. User leaves the device
> >
> > plugged in, and reboots into OS X. Device does not work.
> > Unplug and re-plug the device, and now it works.
> >
> >
> >
> > So I suspect that power is not being dropped to the USB bus
> > during restart ( this is a G4 desktop ),
> >
> > and that the OS 9 firmware keeps running, which is not
> > compatible with the OS X software.
> >
> > When I unplug and re-plug I get the OS X firmware, and all is well.
> >
> > The same problem happens in reverse if you start in OS X and
> > reboot to 9.
> >
> >
> >
> > So how can I force the re-enumeration of the device when the
> > system reboots?
> >
> >
> >
> > thanks,
> >
> > fred ross-perry
> >
> > intellitools, inc. _______________________________________________
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