Re: rtc again...

On   Tue, Aug 8, 2000, Gabriel Paubert wrote:

On Fri, 4 Aug 2000, Geert Uytterhoeven wrote:

quoted

quoted

Actually given the problems with RTC being UTC or local time, the offset
might perhaps better be setup as a kernel parameter so that th system
start up in a known good state. It seems that it is in RAM for Macs, but
what about other machines (I have no problems since all my machines are
UTC and I simply refuse to use an OS which requires anything else) ?

Why do you want to handle the offset in the kernel???

Any decent distro (e.g. Debian) allows to configure the time system for a
hardware clock running in either UTC or local time, so the correction will be
done on boot up.

I think there is some misunderstanding here. I don't want to handle the
offset in the kernel, with one possible exception: when reading the
RTC for the first time to initialize xtime. Getting timestamps right as early
as possible might be important in some cases, and it's not a big deal
since the code to do this is small and thrown away anyway.

Oh and I can't remember whether the clock or hwclock command ever worked
on my machines. I think hwclock did once upon a time; life is so much
simpler with NTP anyway (but it is run quite late in the boot process,
actually just before the rc.local script on most of my machines and after
mounting NFS file systems and starting daemons like syslogd/crond/inetd).

I seems to me (in summary) [since I started this thread :-) ]:

we can:

(a) Fix up time in the kernel to emulate UTC
(b) Fix up time in the kernel to emulates Local Time

Which (or will both) of these works with hwclock (since that is the
mechanism at 2.4.0 ?)  and for those of us switching to-and-ffo is also
being used at 2.2.17

I would like to make sure that timestamps are right during kernel boot -
and, at the moment, when using 2.2.17 I have to 'artificially' disable rtc
to get the correct time.

For many (paid-by-the-call) telephone network users NTP is not a suitable
option - they don't like the machine making calls without asking.

Iain.

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On Tue, 8 Aug 2000, Iain Sandoe wrote:

I seems to me (in summary) [since I started this thread :-) ]:

we can:

(a) Fix up time in the kernel to emulate UTC
(b) Fix up time in the kernel to emulates Local Time

Please also think about people who really run their RTC in UTC, who don't run
MacOS anymore, or who simply don't have a PowerMac.

Which (or will both) of these works with hwclock (since that is the
mechanism at 2.4.0 ?)  and for those of us switching to-and-ffo is also
being used at 2.2.17

Hwclock is userspace. It depends on the distro.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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