Re: Driver Load Sequence

Tech-Archive recommends: Fix windows errors by optimizing your registry

Have you tried changing the order of the USB Host driver so that it loads
last?

--
Bruce Eitman (eMVP)
Senior Engineer
beitman AT applieddata DOT net

Applied Data Systems
www.applieddata.net
An ISO 9001:2000 Registered Company
Microsoft WEP Gold-level Member


"EZ" <EZ@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:FD74D2DD-C9C6-488F-A432-BF006048FA41@xxxxxxxxxxxxxxxx
> Thanks Steve. The problem is that detaching the external device from the
USB
> port doesn't un-load the driver, the driver gets stuck in somehow as if
the
> OS doesnot know that it is there. But this only happens if WinCE is
started
> with the USB device attached to the USB port otherwise everything works
fine.
> When the WinCE device is booted with the external FTDI device physically
> attached to the USB, the Host driver loads the FTDI_SER.DLL at boot time.
The
> problem is that under this senario the Host Controller can not un-load the
> driver when the external device is detached. In a way the OHCI driver gets
> stuck and it wouldn't work properly either. Basically the WinCE device can
> only handle the external USB device properly if it is attached after
> completion of the boot up sequence.
> So to resolve this problem i need to tell WinCE not to load the FTDI
driver
> until every other DLL is loaded and boot up sequence is complete.
> Alternatively if it is not possible to tell wince to load the driver until
> after system boot, i need to somehow un-load the ftdi driver as soon as it
> gets loaded during the system boot up and let the boot up sequence finish
and
> then load the ftdi driver. Maybe i could write a script that runs at start
> up, but by what i read from your post doesnt look like that can be doen
> programatically, something using insmod and rmmod in unix like OSs.
>
> Regards,
> EZ.
>
> "Steve Maillet (eMVP)" wrote:
>
> > You can't programmatically load/unload USB client drivers only the USB
host
> > driver can do that. Just unplug the device and the host driver will
unload
> > the client driver.
> >
> > --
> > Steve Maillet
> > EmbeddedFusion
> > www.EmbeddedFusion.com
> > smaillet at EmbeddedFusion dot com
> >
> >
> >


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