interconnection between uCLinux and Windows by USB gadget

Hello,

I've already read some bad news about the chance to interconnect a Linux system and a Windows system using the USB gadgets. Below you can find some tests done to verify the current functionality of both device and driver. Seeing that in linux the game works, I suspect that the generic windows driver is not the best one can find. In a mailing list I've found the news (in January and June) about the absence of a good driver for Windows. Anyone has recently tested a good driver for windows that makes USB gadgets to be correctly identified? I mean every kind of: open souce, freeware, proprietary, pay-per-use, licensed under fee payment.... any suggestion is accepted, even the suggestion for other tests.

TESTS PASSED:

- usb serial gadget to Linux pc: sending and receiving strings with kermit on PC and using echo and cat on our board

- usb serial gadget to Linux pc: with an application of ours (developed for testing devices) which sets termios, sends and receive characters between the two endpoints and release some stats. No character lost.

- usb serial gadget to Linux pc: file excange after connecting them between PPP over ttyGS and ttyACM

- usb ethernet gadget to linux pc: connecting, ping (with low latency), telnet, file exchange using ftpget and ftpput

- usb compostie ( CDC+ACM): connection, some pings, file exchanges, telnet

- usb serial to linux pc: using an application with a custom protocol, the first handshake always fails but then the other exchanges works as good as on the rs232 serial

FAILED TESTS:

- usb ethernet to Windows pc: after installing the .inf file found in linux documentation in device manger I can see an RNDIS device but with the following error: This device cannot start CODE 10. Microsoft throubleshoot tells about unistalling and reinstalling, plugging and unplugging...

- usb serial to Windows pc: exchange strings using hyperterminal on windows and cat end echo on our board

- usb serial to Windows pc: PPP between the two systems goes up and it is possible to open a telnet or to ping but it has a very burstiness habit in the latency. We observed that pings goes slow if our embedded system pings windows (>1000 ms) but it falls down to 7 ms if windows is pinging the system (eventually if both are pinging each other). The telnet over this PPP connection has a very long latency for echoing the characters and even the execution of a simple command (like ls) takes a while before getting the results (which come alltogheter fastly).

EQUIPEMENT FOR TESTS:

- Windows XP Pro SP3

- Linux openSuse 10.11

- Embedded system: custom board with NXP ISP1161X controller. uClinux released in August with kernel 2.6.30