forcedeth fails on second port with error -12

[Sebastian Haase <haase@msg.ucsf.edu>]

Hi,
I have two on board ethernet on Tyan  Thunder K8WE  (s2895).
It seems the forcedeth driver works fine. 
But only for eth0. Eth1 doesn't show up...
I thought I might need to specifically reload the module a second time with 
different options for the second port (like in /etc/modutils or so) !?!?!????

then I discovered an error message in dmesg:
<cut and paste from dmesg>
forcedeth.c: Reverse Engineered nForce ethernet driver. Version 0.48.
ACPI: PCI Interrupt 0000:00:0a.0[A] -> Link [LMAC] -> GSI 21 (level, high) -> 
IRQ 18
PCI: Setting latency timer of device 0000:00:0a.0 to 64
eth0: forcedeth.c: subsystem: 010f1:2895 bound to 0000:00:0a.0
ACPI: PCI Interrupt Link [LNK3] enabled at IRQ 19
GSI 19 sharing vector 0xC9 and IRQ 19
ACPI: PCI Interrupt 0000:80:0a.0[A] -> Link [LNK3] -> GSI 19 (level, high) -> 
IRQ 19
PCI: Setting latency timer of device 0000:80:0a.0 to 64
0000:80:0a.0: Invalid Mac address detected: 00:00:00:00:00:00
Please complain to your hardware vendor. Switching to a random MAC.
0000:80:0a.0: open: Could not find a valid PHY.
ACPI: PCI interrupt for device 0000:80:0a.0 disabled
forcedeth: probe of 0000:80:0a.0 failed with error -12
Probing IDE interface ide0...
</cut and paste from dmesg>

lspci shows that 0000:80:0a.0 should be my second NIC.

Any idea what error -12 could mean ?

Thanks,
Sebastian Haase