Re: tty with non-standard irq
On Sun, 17 Aug 1997, Ricardo Muggli wrote:
> How do I set up a com port in debian that has a non standard irq?
> The port I want to use is 0x2E8 irq2
Um, I don't think it is a very healthy practice to use irq 2 for a serial
port.
Irq 2 is called the "cascade interrupt". Pc-xt's, which have only one
interrupt controller, have 8 irq's, but in at's a second controller is
cascaded from the primary interrupt controller's irq 2 to yield a total of
15 usable interrupts (because you cannot use irq 2 for a real interrupt
anymore.) Read a pc-hardware faq if you want to know more about this.
So unless you are running linux on a 8086, you can forget irq 2, I think.
Joost
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