On Tue, 20 Oct 1998, Tim Wolfe wrote:
> We are using the Znyx ZX346 which has 4 ports and is 10/100 autosensing.
> It is based on the Tulip chipset and works really well for us. They go for
> about $600 if you are a reseller. We have 2 cards in a machine thus far,
> and although each port reports that it is using an IRQ, it is actually only
> taking 1 per card as far as I can tell.
This is a very common BIOS bug: most x86 BIOSes will configure bus bridges
correctly, but incorrectly assign multiple IRQs to devices behind the bridge
when all devices are actually interrupting on the single INTA output of the
bus bridge.
The Tulip driver works around this bogus behavior while fixing up another
common mis-feature of multiport cards: there is sometimes only a single
ethernet address EEPROM instead of one for each port.
Donald Becker [EMAIL PROTECTED]
USRA-CESDIS, Center of Excellence in Space Data and Information Sciences.
Code 930.5, Goddard Space Flight Center, Greenbelt, MD. 20771
301-286-0882 http://cesdis.gsfc.nasa.gov/people/becker/whoiam.html
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