cvs commit: src/sys/dev/mk48txx mk48txx.c mk48txxreg.h

[Marius Strobl]

On Mon, Sep 20, 2004 at 01:46:13PM -0400, John Baldwin wrote:
> On Sunday 19 September 2004 05:38 pm, Marius Strobl wrote:
> > marius      2004-09-19 21:38:11 UTC
> >
> >   - Fix two off-by-one errors in the handling of the day of week. The
> >     genclock code represents the dow as 0 - 6 with 0 being Sunday but the
> >     mk48txx use 1 - 7 with 1 being Sunday. In the settime function when
> >     writing the dow to the clock the range wasn't adjusted accordingly but
> >     the clock apparently played along nicely otherwise the second bug in
> >     the gettime function which mapped 1 - 7 to 0 - 6 but with 0 meaning
> >     Saturday would have been triggered. Fixing these makes the date being
> >     stored in the same format Sun/Solaris uses and cures the "Invalid time
> >     in real time clock. Check and reset the date immediately!" when the
> >     date was set under Solaris prior to booting FreeBSD/sparc64. [1]
> >     Looking at other clock drivers/code e.g. FreeBSD/alpha the former
> > "bug", i.e. storing the dow as 0 - 6 even when the clock uses 1 - 7, seems
> > to be common but might be on purpose for compatibility when multi-booting
> > with other OS which do the same. So it might make sense to add a flag to
> > handle the dow off-by-one for use of this driver on platforms other than
> > sparc64.
> 
> Hmm, I get them occasionally on my Alphas which only run FreeBSD, so I think 
> it's probably a bug that needs to be fixed in FreeBSD/alpha.
> 

Bruce Evans pointed me at src/sys/i386/isa/clock.c revision 1.191 which
fixed the same thing. According to its commit message the bug actually
caused problems on Soekris machines.
On my PWS which also only runs FreeBSD/alpha I ocassionally get
"WARNING: clock gained X days -- CHECK AND RESET THE DATE!". This could
be a problem similar to the one on Soekris boards when using the wrong
encoding for the weekday but I haven't looked into it, yet.
Do you also get "clock gained X days" warnings or something different?
Do you have an idea when this happens?

Marius