HP6000 laptop, builtin 3Com "minipci" ethernet adapter.  Worked fine under
stock RH7.1.  Fails at bootup with no link, but repeated ifdown/ifup seems
to eventually work.  No errors are reported by ifconfig.

lspci -v

00:0b.0 Ethernet controller: 3Com Corporation 3c556 Laptop Tornado (rev 10)
        Subsystem: 3Com Corporation: Unknown device 6256
        Flags: bus master, medium devsel, latency 80, IRQ 10
        I/O ports at 1800 [size=128]
        Memory at f4002400 (32-bit, non-prefetchable) [size=128]
        Memory at f4002000 (32-bit, non-prefetchable) [size=128]
        Expansion ROM at <unassigned> [disabled] [size=128K]
        Capabilities: [50] Power Management version 1

dmesg

3c59x.c:LK1.1.13 27 Jan 2001  Donald Becker and other. 
http://www.scyld.com/network/vortex.html
See Documentation/networking/vortex.txt
eth0: 3Com PCI 3c556 Laptop Tornado at 0x1800,  00:00:86:41:c4:4d, IRQ 10
  product code 0000 rev 00.0 date 09-02-99
eth0: CardBus functions mapped f4002000->c8844000
  8K byte-wide RAM 5:2 Rx:Tx split, MII interface.
  MII transceiver found at address 0, status 7809.
  Enabling bus-master transmits and whole-frame receives.
eth0: scatter/gather disabled.  h/w checksums enabled.