There is a watchdog device in Routerstation. But the default kernel does not support it. If I want to use it, I must re-compile the kernel and enable the follow configure options: CONFIG_WATCHDOG_NOWAYOUT=y CONFIG_WATCHDOG=y CONFIG_AR71XX_WDT=y So I think we need to add them to the default kernel configure.
tagging this as an enhancement, but it is something we can do.
http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=949c3521abb7fe9fc8f367ec4ce6b8a4ed8a1267
Verified with the late commit 2f3994545e757efc575341f2b984a62a0a3441fd There is have watchdog on routerstationpro.