> But this is not true. There must be another reason why Linux' serial
> driver doesn't allow multiple ports to use the same IRQ. The serial driver
> could very well ask the serial port if it was the one to generate the
> interrupt. Don't tell me it's impossible, I have done it myself. Just
> check base+2 for a zero in bit 0.
You can write any code you want, but the electric signals on the IRQ
line on your backplane have the last word, and they say that this
solution is going to be unreliable and flaky at best if you share
interrupts between two cards in use simultaneously. Blame it on IBM.
...............................................................................
Peter Desnoyers : Midnight Networks Inc. 200 Fifth Avenue Waltham MA 02154
pjd@midnight.com : Ph. 617/890-1001 Fax -0028 The Best in Network Software