This is the RHEL2.1-ia64 version of bug #127815 and bug #137214.
If you set up netconsole on a box with an e100 network card, unplug the network
cable for 20 seconds or so, then plug it back in, the machine hangs right after
printing the `e100: eth3 NIC Link is Up 100 Mbps Full duplex' message.
Since this issue is beyond the scope of the current support status of RHEL2.1, I
am closing it as WONTFIX.