Messages in this thread | | | Date | Sun, 14 Nov 2004 09:28:36 -0500 (EST) | From | linux-os <> | Subject | Re: RTC Chip and IRQ8 on 2.6.9 |
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On Sun, 14 Nov 2004, Florian Schmidt wrote:
> On Fri, 12 Nov 2004 11:47:10 -0500 (EST) > linux-os <linux-os@chaos.analogic.com> wrote: > >> >> I must use the RTC and IRQ8 in a driver being ported from >> 2.4.20 to 2.6.9. When I attempt request_irq(8,...), it >> returns -EBUSY. I have disabled everything in .config >> that has "RTC" in it. >> >> The RTC interrupt is used to precisely time the sequencing >> of a precision A/D converter. It is mandatory that I use >> it because the precise interval is essential for its >> IIR filter that produces 20 bits of resolution from a >> 16 bit A/D. >> >> 8: 1 IO-APIC-edge rtc > > maybe it's the HPET timer providing rtc emulation? > > flo > It turned out to be RTC timer software that, when built-in, grabbed IRQ8 even though it didn't use it. I reconfigured it as a module. Then, when I unload the module, the IRQ gets freed up. (Fedora loads, I guess, everything...).
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