DFE-538TX not working with 8139cp, 8139too or via-rhine

[CestusGW]

Alright, I'm trying to get a DFE-538TX NIC to work in my Linux box, and according to the Ethernet howto it should need the realtek 8139too drivers. I'm using the 2.4.20 gaming sources kernel, and I've included the driver modules (in the kernel, not actual modules) for the via-rhine, 8139too and 8139cp in my kernel. However, netmount always fails to get the device eth0 working properly during my bootup (so ifconfig etc never work properly). When I place the drivers for the realtek cards outside my kernel and try to use modprobe or modify my /etc/modules.d/aliases file to load up a driver, i get something like this:
modprobe 8139too
/lib/modules/2.4.20-gaming-r3/kernel/drivers/net/8139too.o: unresolved symbol _mmx_memcpy

And the module fails to load. I've had this behaviour happen with PNP OS set to both on and off in the BIOS (although then WinblowsXtraProblems fails to use the NIC with PNP OS off). I'd include the output from /proc/pci in this post (as I've seen others do) but it doesn't actually show in /proc. Is my kernel missing something? Any help on this would be appreciated, thanks.

[cyrillic]