Hi. I'm trying to put to work 4 com ports in my pc. I have 2 on board, and bought an old Multi IO card with another 2, & a parallel port. Because the Multi IO card is tied up to irq 3 & 4, I had to make some hardware changes. I noticed that serial ports module, could enable IRQ_SHARE and so instead of wiring the board to other 2 interrupt lines, i made some hardware & added it to the board so that both ports could share the same interrupt, which I decided to be irq line 7. This line, ( 7) is used by the parallel port 0x378. I can disable it, but if possible I'd like to have it enabled, and using the same irq 7. This may look a bit weird, but I'm an electronics guy that likes to have lots of gadgets hanging on the computer. What I really want surely has something to do with the kernel internals. I want that both serial.o and parport_pc.o ( i mean, both the modules for serial ports and parallel ports ) can work using the same irq ( 7 ). What are the chances to achieve that, and how. I already have anotherparallel port on 0x278. Switching cards, more hardware changes, or disabling ports are not options. And dont tell me that the isa bus interrupts should NOT be shared.
Here are some facts I found: when parport_pc configures 0x378 to work, nothing works. when parport_pc does not, it works fine. The problem must be a conflict between both ISR's installed. Any help or comment is welcome thanks J.A.Serralheiro
