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SubjectRe: Periodic RTC interrupt
On Sat, Feb 19, 2000 at 08:38:17PM -0500, Jeff Garzik wrote:
> Ralf Baechle wrote:

> > What application need the /dev/rtc periodic interrupt? I'm porting to
> > a platoform which uses a M58T35 RTC which doesn't supply such an
> > interrupt, so the question is if it's worth to care at all and possibly
> > emulate an timer interrupt from another source.
>
> The RTC driver doesn't make much sense without interrupts...

hwclock tries to use /dev/rtc to read and set the hardware clock.

[Of course the idea is that if the kernel provides this access
then a userspace program need not try to access the hardware itself.
Today there are still machines where "hwclock --directisa" works
but "hwclock" fails, so the kernel code for rtc is not perfect yet.]

Andries


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