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Re: can't find interrupt number under /proc/interrupts for the pci multi

To: Alan Cox <>
Subject: Re: can't find interrupt number under /proc/interrupts for the pci multi-port on db1550
From: rolf liu <>
Date: Tue, 28 Jun 2005 12:01:26 -0700
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Reply-to: rolf liu <>
Thanks for your help.
I tried your script. the result is really interesting.
the interrupt is still shown as 0 times. I even hacked into the do_IRQ
and handle_IRQ_event, let them printk if there is a interrupt number 2
coming in. Still no printk output through klogd logfile. more
interesting thing is there is a timer on the multi-port board, which
is keeping time-out and keeping the timer interrupt up.

Is that possible the board is not enabled to interrupt correctly?
really a pain. I just got the driver from the company. don't know what
is the start point if I want to really dig into the hardware control
of the board.



On 6/28/05, Alan Cox <> wrote:
> On Maw, 2005-06-28 at 17:30, rolf liu wrote:
> > but the number of interrupts for that driver is always 0, which seems
> > not OK. I am wondering if such interrupt is routed to somewhere else?
> I'd expect it to stay zero unless characters were received or events
> occurred. Something like
>   (echo "Hello world"; cat ) <> /dev/ttywhatever
> ought to cause interrupts
> [That bit of script writes Hello world to the serial port and then
> copies anything from it back to it until you hit ^C]

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