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Date: Mon, 22 Oct 2007 12:18:08 -0400 From: lsorense@...lub.uwaterloo.ca (Lennart Sorensen) To: Chris Bergeron <chris@...urn.com>, linux-kernel@...r.kernel.org Subject: Re: Syba 8-Port Serial Card Unidentified By Kernel On Mon, Oct 22, 2007 at 07:33:23PM +0400, Andrey Panin wrote: > So the card probably generates screaming interrupt... that's bad. > I found some docs for IT887x chips, according to these docs IT887x > have simple interrupt controller inside. Further investigation is needed. > > Can you post output of lspci -xxx ? Is it possible they put a chip on to generate a PCI interrupt on perhaps PCIB on the slot from the serial chips directly, so that they didn't have to turn interrupts from the serial chips into a signal that forces the parallel port to generate an interrupt? After all that would reduce latency, and if you use PCIA for the parallel port, PCIB for the first serial chip and PCIC for the second, you might get a much more efficient design, although the driver would have to register all those IRQs. What IRQ is each PCI device in that system using right now? perhaps we could figure out what irq 17 would be on that PCI slot. -- Len Sorensen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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