NCR53C815 vs Tulip: sharing IRQ fails

[Hardware Stuff]

I have a system that's not short on IRQs, but in which the BIOS
insists on giving the DTC 3130B NCR53C815 and the D-Link DFE500-Tx
21040 the same IRQ.  The NCR53C815 reports obtaining a shared IRQ and
functions fine, while it's impossible to ifconfig the Tulip.  It's an
i386 2.0.36 kernel with the latest patches for the NCR.

I'm be happy if I could force either card to a different IRQ, but
nothing has worked yet.  Has anyone had this setup working?

Suggestions?