[PATCH] configs: mediatek: do not autostart the watchdog on the Genio EVKs

[Tom Rini]

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 <ccaione at baylibre.com>

Thanks!

Reviewed-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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