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

[Matt DeVillier]

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

[Solanki, Naresh]

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.

Thanks,
Naresh G Solanki

Post by Matt DeVillier
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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