BUG: 2.6.14-rc2 sets the wrong time in NVRAM on PowerMac G5

Florin Iucha florin at iucha.net
Tue Sep 27 01:44:15 EST 2005

On Fri, Sep 23, 2005 at 08:55:54AM +1000, Benjamin Herrenschmidt wrote:
> >    florin at zeus$ dmesg | grep "Linux version"
> >    Linux version 2.6.14-rc2 (root at zeus) (gcc version 4.0.2 20050808
> >    (prerelease) (Ubuntu 4.0.1-4ubuntu8)) #1 SMP Tue Sep 20 17:24:52
> >    CDT 2005
> Hrm... this is a PMU based machine right ?

I believe it is. It is the newest PMac that Apple sells.

>                                            I don't think we changed
> anything to that code... Can you try isolating the specific patch that
> causes the breakage ?

It is quite elusive. It sometimes happens when rebooting from Mac to
Linux, or when cold-booting. I have tried to find a pattern, but I
can't. The only "solid" thing is that it does not happen at all with
2.6.14-rc1 or 2.6.13.

Another datapoint: with Ubuntu kernel linux-image-2.6.12-7-powerpc64-smp
the machine real time clock is fine, with the kernel
linux-image-2.6.12-8-powerpc64-smp it goes into the future (Apr 2037)!

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