Any network interface card (NIC) supported by the Linux kernel are also be supported by the boot disks. All network drivers are compiled as modules so you need to load one first during the initial network setup. The list of supported network devices is:
Channel to Channel (CTC) and ESCON connection (real or emulated)
OSA-2 Token Ring/Ethernet and OSA-Express Fast Ethernet (non-QDIO)
Inter-User Communication Vehicle (IUCV) — available for VM guests only
OSA-Express in QDIO mode, HiperSockets and Guest-LANs