[tulip] Osicom 123400-21 40port card

Donald Becker becker@scyld.com
Wed Jul 31 10:15:00 2002

On Wed, 31 Jul 2002, Jason Marshall wrote:

> > > > Curious: this board appears to have an EEPROM on all ports.  Could you
> > > > please confirm with 'tulip-diag -e'?  That would prevent the IRQ
> > > > correction code from triggering.
> Is there any way this can be accomodated?  Or is IRQ sharing impossible
> when you have four EEPROMs on one board?

There is no problem with four EEPROMs.  That's a better configuration
than the usual setup.

The problem is that the driver uses the missing EEPROM on ports 1-3 to
trigger a work-around for a common BIOS bug: the BIOS does not correctly
record which devices are using which IRQs.

> > You don't need to do anything if your BIOS doesn't have the
> > PCI-bridge-IRQ bug.  But in this case you seem to have that bug.  Only
> > one of the four ports will have a working IRQ.
> It does seem that all four of the IRQ's work, though.

Have you tested all four ports?  If they all work, you don't have the

> But I am curious about what my options are.  I've got at least a few of
> these cards, and it would be nice to use them all in the same box (that
> was the purpose behind buying them) for a 12- or 16-port router at our
> network's border.

That should work.
Routing is, however, beyond the scope of this list.

Donald Becker				becker@scyld.com
Scyld Computing Corporation		http://www.scyld.com
410 Severn Ave. Suite 210		Second Generation Beowulf Clusters
Annapolis MD 21403			410-990-9993