Hi Luke..
You did not say what version of E-Smith you use..
I Version 4.0, pcnet32 is on the list, i have one..:

If not, just do like this..
Logon as root - Alt-F2.
AMD Netcard Support, E-Smith Version.
/sbin/e-smith/./config set EthernetDriver1 pcnet32
/sbin/e-smith/./signal-event console-save