Re: watchdog timer programming

mike tancsa <[email protected]> writes:

> I am trying to get
>
> superio0: <ITE IT8613 SuperIO (revision 0x0c)> at port 0x2e-0x2f=20
> on isa0
> itwd0: <Watchdog Timer on ITE SuperIO> at WDT ldn 0x07 on=20
> superio0
> itwd0: Configured for system reset on timeout
>
> working on FreeBSD.  The driver seems to load / attach fine, but=20
> it does
> not want to reboot the box.  Adding a #define DIAGNOSTICS 1
>
> shows
>
> itwd0: <Watchdog Timer on ITE SuperIO> at WDT ldn 0x07 on=20
> superio0
> itwd0: Configured for system reset on timeout
> itwd0: setting timeout to 4
> itwd0: setting timeout to 4
> itwd0: setting timeout to 4
> itwd0: setting timeout to 4
> itwd0: setting timeout to 4
> itwd0: setting timeout to 4
>
> when I do
>
>  watchdogd -t 3
>  killall -9 watchdogd
>
> but never a reboot :(
>
> Any idea how to get this hardware working ?

Do you know if, at least, the pre-timeout is working?

Glancing at the code, this chip can be configured to use a=20
specific IRQ (its
default one is 0x40) and have an "NMI mode" (relying on an
explicitly configured IRQ). Maybe playing with the dev.itwd.irq=20
and .nwi
tunables could get us some hints.

Also this code from itwd's wd_func puzzle me a bit:

    superio_write(dev, 0x73, val);
    if (superio_read(dev, 0x73) !=3D val)
      superio_write(dev, 0x73, val);

It let me think that we either are writing twice to the same I/O
port by mistake or the corresponding chip's register enforce a
specific protocol to modify it. If the later, the code don't seems
to be able to detect a "protocol error".

By the way, do you have the datasheet of the ITE chip? (I know I
must be very optimistic to ask such a question ;))

Regards,
--=20
St=C3=A9phane Rochoy
O: Stormshield