This page describes how to patch a recent linux kernel so that your Window Mobile device can be used via usb.
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If you are following these instructions, you should not install any of the usb-rndis-* drivers.
You must have a kernel from version 2.6.21 or later.
As of version 2.6.21, the Linux kernel has most of the required support built in, and thus doesn't require the usb-rndis-lite driver.
First, patch your kernel
For 2.6.21 kernels
cd /usr/src/linux wget http://synce.svn.sourceforge.net/svnroot/synce/trunk/patches/linux-2.6.21-rndis_host-wm5.patch patch -p1 < linux-2.6.21-rndis_host-wm5.patch
For 2.6.22 and 2.6.23 kernels
cd /usr/src/linux wget http://synce.svn.sourceforge.net/svnroot/synce/trunk/patches/linux-2.6.22-rndis_host-wm5.patch patch -p1 < linux-2.6.22-rndis_host-wm5.patch
Configure you're kernel
You need the following options in your kernel config:
CONFIG_USB_USBNET=y CONFIG_USB_NET_CDCETHER=y CONFIG_USB_NET_RNDIS_HOST=y
Selecting them as modules will also work.
Compile your kernel
Finally, build and install your kernel as usual.