Re: [PARPORT] SIIG parallel port card interrupts

Nathan Meyers (
Mon, 07 Feb 2000 17:53:11 -0800

Richard Stover wrote:
> I'm using a SIIG Inc. Cyberparallel Dual parallel port card in
> a special laboratory application. I'm writing a special device driver
> for Linux (2.2.12-20, Redhat 6.1). The card seems to be working OK.

This may be a long shot, but is the interrupt shared by other devices?
That's a common configuration with PCI devices, but not all drivers can
deal with it. If that's the case, you can assign a PCI device its own
IRQ with the /sbin/setpci command.

Nathan Meyers

> I've done programmed I/O in ECP mode. However, even though interrupts
> are enabled on the card and I see the service interrupt bit change
> from 0 to 1 at the correct time, indicating an interrupt should occur,
> in fact I never see any interrupt. I checked in the linux
> do_8259A_IRQ() routine but no interrupt is seen. The interrupt number
> and its handler do seem to be properly registered. They show up as
> expected in /proc/interrupts. The interrupt number agrees with the
> number reported at boot time by the BIOS.
> I'd sure like to find those missing interrupts.
> I would be happy to hear suggestions for things to check.
> Regards,
> Richard
> -
> Richard Stover email:
> Detector Development Laboratory
> UCO/Lick Observatory Voice: 831-459-2139
> Natural Sciences Bldg. 2, Room 160
> University of California FAX: 831-459-5244
> Santa Cruz, CA 95064 USA FAX: 831-426-3115 (Alternate)
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