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SubjectRe: RTC Chip and IRQ8 on 2.6.9
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...).


Cheers,
Dick Johnson
Penguin : Linux version 2.6.9 on an i686 machine (5537.79 BogoMips).
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