Re: RTC Inappropriate ioctl for device

["Randy.Dunlap" <rddunlap@osdl.org>]

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