On 7/6/26 8:24 AM, Carlo Caione wrote: > U-Boot autostarts the SoC watchdog (CONFIG_WATCHDOG_AUTOSTART default > y) and services it from its main loop, but nothing services it after > ExitBootServices()/bootm: an EFI-booted OS that does not take over the > watchdog in time is reset mid-boot at a wall-clock-dependent point. > > The MediaTek toprgu can count at most ~16 seconds, once firmware stops > servicing it at the handoff, the OS has whatever is left of those 16 > seconds. > > On the Genio 700 EVK the generic Ubuntu 26.04 arm64 image is hard-reset > before its first boot reaches the login prompt: the mtk-wdt driver is > a module loaded from the rootfs and cannot win that race. Nothing tells > a generic OS that the watchdog is armed, so the failure is silent and, > from the user's side, indistinguishable from broken firmware. > > Disable WATCHDOG_AUTOSTART for the Genio EVK boards (mt8365_evk > directly, mt8188.config for the Genio 510/700). > > Signed-off-by: Carlo Caione <[email protected]> > --- > configs/mt8188.config | 1 + > configs/mt8365_evk_defconfig | 1 + > 2 files changed, 2 insertions(+) >
What about Genio 520/720 (mt8189.config) and Genio 1200 (mt8195.config)? Seems like the same reasoning would apply to those. > diff --git a/configs/mt8188.config b/configs/mt8188.config > index 9dfba6bf99f..26823cf35d2 100644 > --- a/configs/mt8188.config > +++ b/configs/mt8188.config > @@ -20,6 +20,7 @@ CONFIG_PINCTRL_MT8188=y > CONFIG_BAUDRATE=921600 > CONFIG_DM_SERIAL=y > CONFIG_MTK_SERIAL=y > +# CONFIG_WATCHDOG_AUTOSTART is not set > CONFIG_WDT=y > CONFIG_WDT_MTK=y > # CONFIG_RANDOM_UUID is not set > diff --git a/configs/mt8365_evk_defconfig b/configs/mt8365_evk_defconfig > index 1a385492547..6620f540fd4 100644 > --- a/configs/mt8365_evk_defconfig > +++ b/configs/mt8365_evk_defconfig > @@ -29,5 +29,6 @@ CONFIG_DM_REGULATOR_MT6357=y > CONFIG_BAUDRATE=921600 > CONFIG_DM_SERIAL=y > CONFIG_MTK_SERIAL=y > +# CONFIG_WATCHDOG_AUTOSTART is not set > CONFIG_WDT=y > CONFIG_WDT_MTK=y
