Rick Denis wrote:
> hi all,
>
> i just installed a new, 2 port, PCI serial board but am baffled by
> something. what is strange, and the reason for this e-mail, is that the
> board is set to use irq 9 and the ports are initialized on irq 9 (ie in
> rc.serial) like so:
>
> setserial /dev/ttyS2 port 0x6c00 uart 16550A irq 9 baud_base 115200
> setserial /dev/ttyS3 port 0x7000 uart 16550A irq 9 baud_base 115200
>
> yet when i issue the command :
>
> setserial -bg /dev/ttyS?
>
> it says /dev/ttyS2 and /dev/ttyS3 are on irq 2! both ports work
> nominally...no complaints there. cat /proc/interrupts says irq 2 is "XT-PIC
> Cascade". it shows nothing for irq 9. why is the board initializing on irq
> 2 if the setserial command says it should grab irq 9? my system is
> slackware 7.1, kernel 2.2.16. any explanation is appreciated, thank you.
>
> rick
>
That is correct, irq2/9 are shared. 2 cascades to 9. It's a hardware thing =)
mike
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