1. IRQ conflicts on serial ports
Hi, all. From reading various threads, I get the impression that there
is a problem with IRQ conflicts and serial ports. What I'm doing is:
Kernel 0.99pl10
VESA IDE/ 2 serial/ 1 Parallel/ 1 Games port card
This card is set up the normal way:
COM1 (addr: 3f8 IRQ4) COM2 (addr: 2f8 IRQ3)
Next I buy a 2 serial/ 1 Parallel/ 1 Games port card
Setup: COM3 (addr: 3e8 IRQ4) COM4 (addr: 2e8 IRQ3) Games port disabled.
Now, I can't use, say, COM1 and COM3 *at the same time*. This I guess
is because of an interrupt conflict.
My question: is there anything that can be done about this? As I
understand it, since the ports have different addresses, the kernel
interrupt handler could interrogate the devices to determine which one
sent the interrupt? I'm assuming that the interrupt signals are activated
by an open collector circuit.
Is this a fundamental limitation, or can the kernel be changed to cope with
this?
--
Regards,
Richard Gooch,
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