By reading the DS1687 datasheet I managed to fix it. A diff follows:
# cvs diff -u sys/dev/ic/ds1687reg.h sys/arch/sgi/dev/dsrtc.c
Index: sys/dev/ic/ds1687reg.h
===================================================================
RCS file: /cvs/src/sys/dev/ic/ds1687reg.h,v
retrieving revision 1.2
diff -u -r1.2 ds1687reg.h
--- sys/dev/ic/ds1687reg.h 31 Mar 2008 07:14:00 -0000 1.2
+++ sys/dev/ic/ds1687reg.h 1 Apr 2012 00:59:52 -0000
@@ -62,3 +62,5 @@
#define DS1687_EXT_CTRL 0x4a /* Extended control register. */
#define DS1687_KICKSTART 0x01 /* Kickstart flag. */
+#define DS1687_EXT_CTRL_B 0x4b /* Extended control register B. */
+#define DS1687_ALRM_ENABLE 0x02 /* Bit 1 - WIE */
Index: sys/arch/sgi/dev/dsrtc.c
===================================================================
RCS file: /cvs/src/sys/arch/sgi/dev/dsrtc.c,v
retrieving revision 1.11
diff -u -r1.11 dsrtc.c
--- sys/arch/sgi/dev/dsrtc.c 7 Nov 2009 14:49:01 -0000 1.11
+++ sys/arch/sgi/dev/dsrtc.c 1 Apr 2012 00:59:52 -0000
@@ -315,7 +315,7 @@
ds1687_set(void *v, struct tod_time *ct)
{
struct dsrtc_softc *sc = v;
- int year, century, ctrl, dm;
+ int year, century, ctrl, dm, alarm;
century = ct->year / 100 + 19;
year = ct->year % 100;
@@ -342,6 +342,16 @@
(*sc->write)(sc, DS1687_MONTH, tobcd(ct->mon, dm));
(*sc->write)(sc, DS1687_YEAR, tobcd(year, dm));
(*sc->write)(sc, DS1687_CENTURY, tobcd(century, dm));
+
+ /* Reset the RTC alarm. */
+ (*sc->write)(sc, DS1687_SEC_ALRM, 0);
+ (*sc->write)(sc, DS1687_MIN_ALRM, 0);
+ (*sc->write)(sc, DS1687_HOUR_ALRM, 0);
+ (*sc->write)(sc, DS1687_DATE_ALRM, 0);
+
+ /* Disable the alarm wakeup. */
+ alarm = (*sc->read)(sc, DS1687_EXT_CTRL_B);
+ (*sc->write)(sc, DS1687_EXT_CTRL_B, alarm & ~DS1687_ALARM_ENABLE);
/* Enable updates. */
(*sc->write)(sc, DS1687_CTRL_B, ctrl);
#
On Sun, Mar 25, 2012 at 9:00 PM, Miod Vallat <m...@online.fr> wrote:
>> But a few days ago I installed OpenBSD/sgi 5.0 (also tried the snapshot,
>> but it crashed) and every day since I installed it, every day at midnight
>> the machine automaticly powers on.
>>
>> Does this happen to anyone else? How can I disable this?
>
> This has happened to me a few years ago on a low-end R5000SC@180 O2, but
> eventually stopped after leaving the machine unplugged for a while
> (read: months). There is probably something slightly wrong in the way
> the Dallas clock registers are updated by OpenBSD, but I have not been
> able to find it so far.
>
> Miod
