Re: RTC Inappropriate ioctl for device

[Randy.Dunlap]

Aurélien GÉRÔME wrote:
> On Mon, Feb 14, 2005 at 07:45:11PM -0800, Randy.Dunlap wrote:
>
> > Aurélien GÉRÔME wrote:
> >
> > > Hi,
> > >
> > > Having CONFIG_RTC=y, I tried on x86 the rtctest program found in
> > > linux-2.6.10/Documentation/rtc.txt. However, it failed at:
> > >
> > > ioctl(fd, RTC_UIE_ON, 0);
> > >
> > > with:
> > >
> > > ioctl: Inappropriate ioctl for device
> > >
> > > Did I miss something? Maybe something else conflicts with CONFIG_RTC?
> > >
> > > Cheers.
> >
> > Do you have an HPET timer enabled?  That could cause a conflict.
>
>
> I have HPET timer enabled.

Please add/enable the second line here:
CONFIG_HPET_TIMER=y
# CONFIG_HPET_EMULATE_RTC is not set

and try it again.


> > Does /proc/interrupts report rtc interrupts increasing when you
> > run rtctest?
> > I.e., does the number of this line increase like this?
> >
> >  8:        131    IO-APIC-edge  rtc
>
>
> I have no lines with rtc at the end, maybe due to HPET.
>
> Is it a known behaviour of RTC with HPET?

Apparently that's why a config option was added for it.

> > rtctest works for me (2.6.11-rc4).  Maybe send me the strace
> > output when you run rtctest and your .config file.
>
>
> See attachment for strace and .config.
>
>
> > Oh, and your kernel boot log, maybe there are some rtc driver
> > messages in it.
>
>
> See attachment for kern.log.
>
> I have bzip2'ed kern.log and .config, since they were rather large.


--
~Randy
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