They are present on some motherboards as secondary ata controller but are unsupported with tiger and leopard

So I did a try to insert pci id`s into AppleVIAATA.kext with known and usefull chipsets

This driver I was make against unstable Tiger using Leopard sources and Xcode 2.5 with Tiger universal binary frameworks

It helps me to have stable LAN connection

Many people use it in Leopard with success