On Fri, Sep 11, 2026 at 02:41:21PM +0200, Jeremie Courreges-Anglas wrote:
> On Sat, May 16, 2026 at 04:32:22PM +0200, Jeremie Courreges-Anglas wrote:
> >
> > Most of the milk-v jupiter machines I have start to exhibit the same
> > behavior after some time:
> >
> > [...]
> > smtpmic0: can't read register 0x1d
> > smtpmic0: can't write register 0x1d
> > WARNING: can't update clock chip time
> > smtpmic0: can't read register 0x1d
> > smtpmic0: can't write register 0x1d
> > WARNING: can't update clock chip time
> > etc etc
> >
> > so the RTC isn't updated hourly, but later at reboot:
> >
> > smtpmic0: can't read register 0x1d
> > smtpmic0: can't write register 0x1d
> > WARNING: can't update clock chip time
> > syncing disks... done
> > smtpmic0: can't read register 0x1d
> > smtpmic0: can't write register 0x1d
> > WARNING: can't update clock chip time
> > xhci0: halt timeout
> > xhci0: halt timeout
> > xhci0: reset timeout
> > rebooting...
> > smtpmic0: can't read register 0x7e
> > smtpmic0: can't write register 0x7e
> > reboot failed; spinning
> >
> > oops. Looking at the conserver logs I see these messages may appear
> > 1h+ up to 48h+ after boot. No idea what is going on.
>
> Some more data:
> - is it a big deal for me since an affected machine can't reboot and
> that means the machines in Theo's basement
> - it happens whether the machines are idle or busy
>
> The dumb diff below reliably fixes clock setting and reboots. Maybe
> there's a better way but my more complex attempts have failed and I've
> been sitting on this since months.
>
> Thoughts? ok?
The SpacemiT documentation for ICR IUE has:
"Software must ensure the I2C bus is idle before setting this bit."
which is ISR IBB
"I2C Bus Busy.0 = I2C bus is idle"
untested as I don't have the hardware
Index: sys/arch/riscv64/dev/smtiic.c
===================================================================
RCS file: /cvs/src/sys/arch/riscv64/dev/smtiic.c,v
diff -u -p -r1.1 smtiic.c
--- sys/arch/riscv64/dev/smtiic.c 6 Apr 2026 10:30:27 -0000 1.1
+++ sys/arch/riscv64/dev/smtiic.c 11 Sep 2026 13:30:06 -0000
@@ -186,6 +186,9 @@ smtiic_i2c_acquire_bus(void *cookie, int
{
struct smtiic_softc *sc = cookie;
+ if (smtiic_wait_state(sc, ISR_IBB, 0))
+ return EIO;
+
HSET4(sc, ICR, ICR_IUE);
return 0;
}
