On 12/11/13 at 03:58pm, Baoquan He wrote:
> > Why can't systemd help?
> >
> > dracut also uses the hardware watchdog. There is even a software watchdog device
> > driver (softdog).
>
> Hi Harald,
>
> Before we encoutered a NMI watchdog problem, that hardware is iTCO_wdt
> residing in lpc_ich mtd device. Then Don (dzickus@xxxxxxxxxx) found the
> iTCO_wdt driver has code that tells it to turn off the watchdog until
> userspace turns it on. So for kdump, the device will get turned off
> (which is what we want).
>
> Not all devices may behave this way, but iTCO_wdt should cover the
> majority of the problems we are seeing.
>
> Now when the watchdog ko is added into kernel, with the help of udevd,
> module loading happens automatically, that's great. So the thing is
> where to put the code that add watchdog ko into initramfs, 04watchdog
> seems like the suitable place.
>
> Baoquan
> Thanks
Hi Harald,
Do you think it's OK to put watchdog driver module adding into
04watchdog? If it's fine to you, I can post a patch.
Baoquan
Thanks
>
> >
> > Just load the module and systemd should start to make use of "/dev/watchdog".
> > With udevd in the initramfs, module loading should happen automatically, you
> > just have to add the watchdog modules to the initramfs.
> >
> > $ echo; echo -n "instmods"; modinfo char-major-10-130 | while read a b; do [[ $a
> > == filename: ]] && (b=${b##*/}; echo -n " ${b%.ko}");done;echo
> >
> > instmods pcwd_pci wdt_pci pcwd_usb alim1535_wdt alim7101_wdt sp5100_tco
> > sbc_fitpc2_wdt ib700wdt ibmasr i6300esb ie6xx_wdt iTCO_wdt it8712f_wdt it87_wdt
> > hpwdt nv_tco sch311x_wdt w83627hf_wdt w83697hf_wdt w83697ug_wdt w83877f_wdt
> > w83977f_wdt machzwd xen_wdt softdog
> >
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