[U-Boot] about am335x watchdog

[Yan, Miao]

Hi Tom,

   In commit 6843918e0035bf06cb65ad2b4c98b38e86e43bd5: am335x: Enable CONFIG_OMAP_WATCHDOG support,
hardware watchdog is enabled for am335x by default which is disabled in SPL,  is this required by Linux or U-Boot
itself ?
   I am asking because when testing with VxWorks (watchdog driver not configured) , I saw random reboot a 
few seconds after kernel booted.  Does U-Boot expect OS to handle such cases  ? Thanks.

Miao