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On Fri, 27 Feb 2004 09:05:48 +0000, Russell King <rmk+lkml@arm.linux.org.uk> wrote: > On Fri, Feb 27, 2004 at 02:26:31PM +0800, Michael Frank wrote: >> Is this to imply that edge triggered shared interrupts are used anywhere? > > It is (or used to be) rather common with serial ports. Remember that > COM1 and COM3 were both defined to use IRQ4 and COM2 and COM4 to use > IRQ3. > >> Never occured to me to use shared IRQ's edge triggered as this mode >> _cannot_ work reliably for HW limitations. > > The serial driver takes great care with this - when we service such an > interrupt, we keep going until we have scanned all the devices until > such time that we can say "all devices are no longer signalling an > interrupt". > > This is something it has always done - it's nothing new. > Sorry, i think the serial driver IRQ is level triggered :) Regards Michael - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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