SIS735: SIS900 LAN not working

Hi, I'm running 2.4.16 on an ECS K7S5A. The LAN support for the embedded SIS900 doesn't seem to work. The driver loads, initialises and transmits, but no packet is going over the wire. WinXP works fine with the SIS900, so I assume something's amiss in the driver. Question: Has anybody successfully used the driver with a SIS735 or K7S5A mobo? Or is there a fix in the works somewhere? Thanks! Martin