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The sysfs state of watchdog0 says whether a process holds the device, and none does: the kernel's core feeds the boot-armed hardware. The check reads WCR through /dev/mem (WDE set, a 60 s period) and expects the state to read inactive. Bench: PASS on image 20260903003213 with WCR 0x771f. The BRINGUP facts bullet says the same.