[coreboot] Watchdog timer (WDT) support on Kabylake w/FSP2.0

Solanki, Naresh naresh.solanki at intel.com
Mon Oct 15 13:11:30 CEST 2018

Can you please check with patch: https://review.coreboot.org/c/coreboot/+/29108
Make sure that mainboard devicetree.cb has PmTimerDisabled=0 for TCO to work.

Naresh G Solanki

On Wed, Oct 10, 2018 at 11:07 PM Matt DeVillier <matt.devillier at gmail.com> wrote:
> greetings!  I'm trying to enable WDT support for Kabylake Chromeboxes
> (google/fizz) but not having any luck.  The current SoC code doesn't 
> expose the FSP fields which appear to control this (WdtDisableAndLock, 
> WatchDog, WatchDogTimerOS, WatchDogTimerBIOS), so I added them to 
> chip_fsp20.c and set them accordingly in devicetree (though it's 
> unclear what the values of WatchDogTimerOS/WatchDogTimerBIOS are to 
> be, the documentation doesn't state if this is a timeout value, units, 
> etc).  Still, I'm unable to remotely trigger a reset via 
> /dev/watchdog0.
> Has anyone else used this feature, or have any insight as to the 
> proper FSP settings? AIUI this works properly on older non-FSP 
> Chromeboxes (Haswell/Broadwell)
> cheers,
> Matt
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