Network cards don't like sharing IRQ

[nevynxxx]

I've just got through installing gentoo on my router, I already use it on other boxes, so I know roughly what I'm doing....Its got 2 network cards, an sis900, and a 3com 3c905B.
My problem is they both want IRQ10, as yuo can see from the dmesg snippet below, my wierdness is, it's only gentoo that don't let them work, I have the same problem with both my gentoo install and with the live cd, the sis card ends up as eth1, and neither cards respond.
I ended up using knoppix to install as this forces 1 of the cards onto another IRQ and presto the sis is eth0(as it should be) and both cards work, the dmesg snippit is from a knoppix boot, i can get a gntoo 1 as well if it will help.....the only difference is that it reports both cards as IRQ10 and a little later the sis card as eth1, no mention of eth0.
Can anyone tell me how to get the cards onlt different IRQs and working?
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[nevynxxx]

Sorry here's that dmesg snippet
sis900.c: v1.08.06 9/24/2002
PCI: Assigned IRQ 10 for device 00:0a.0
eth0: SiS 900 Internal MII PHY transceiver found at address 1.
eth0: Using transceiver found at address 1 as default
eth0: SiS 900 PCI Fast Ethernet at 0xe800, IRQ 10, 00:06:4f:05:fe:9e.
PCI: Found IRQ 10 for device 00:0b.0
IRQ routing conflict for 00:0b.0, have irq 12, want irq 10
3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
See Documentation/networking/vortex.txt
00:0b.0: 3Com PCI 3c905B Cyclone 100baseTx at 0xec00. Vers LK1.1.18-ac
00:10:4b:b4:bc:e0, IRQ 12
product code 4e4b rev 00.9 date 06-19-98
Internal config register is 1800000, transceivers 0xa.
8K byte-wide RAM 5:3 Rx:Tx split, autoselect/Autonegotiate interface.
MII transceiver found at address 24, status 786d.
Enabling bus-master transmits and whole-frame receives.
00:0b.0: scatter/gather enabled. h/w checksums enabled
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[fleed]

I don't know if it helps you at all but I can get my two nics to work fine on the same irq.

[Vergo]

Usually the easiest way to change the irq of a nic is to move it to an other pci/isa slot. The manual of your motherboard should also explain which slots have a shared irq.