On Mon, Jul 06, 2026 at 03:24:59PM +0200, 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]>
Thanks! Reviewed-by: Tom Rini <[email protected]> -- Tom
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