kernel: where's my RTC gone?

[Tomasz Pala]

On Sat, Mar 21, 2009 at 17:26:11 +0100, Arkadiusz Miskiewicz wrote:

>> #  hwclock --debug
>> hwclock from util-linux-2.12r
>> hwclock: Open of /dev/rtc failed, errno=19: No such device.
>> No usable clock interface found.
>> Cannot access the Hardware Clock via any known method.
> 
> You seem to not use udev-core which is a problem.

Yes, it's production system and I cannot aford using such unreliable
solutions.

> Create
> 
> crw-rw---- 1 root root 254, 0 03-20 19:27 /dev/rtc0
0 crw-r--r-- 1 root root 254, 0 Mar 21 20:12 /dev/rtc0

> with rtc major from /proc/devices

#  grep rtc /proc/devices 
254 rtc

Thnx, I've added it to dev-list, but I'm not sure what permissions are
suitable, you've got 660 while /dev/rtc already has 664.


#  hwclock --debug
hwclock from util-linux-2.12r
hwclock: Open of /dev/rtc failed, errno=19: No such device.
No usable clock interface found.
Cannot access the Hardware Clock via any known method.


however:


#  ./hwclock --debug
hwclock from util-linux-ng 2.14.2
Using /dev interface to clock.
Last drift adjustment done at 1237570798 seconds after 1969
Last calibration done at 1237570798 seconds after 1969
Hardware clock is on UTC time
Assuming hardware clock is kept in UTC time.
Waiting for clock tick...
...got clock tick
Time read from Hardware Clock: 2009/03/21 19:17:23
Hw clock time : 2009/03/21 19:17:23 = 1237663043 seconds since 1969
Sat Mar 21 20:17:23 2009  -0.519839 seconds


is it enough to give kernel C: util-linux < 2.14 ?

-- 
Tomasz Pala <gotar at pld-linux.org>