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If CONFIG_WATCHDOG_HELP is defined, a 16-bit timer is used as an auxiliary timer to interrupt us 50ms before the watchdog expires. When the auxiliary timer expires, the stack trace is printed. Watchdog then expires 50ms after and reboots the system. BUG=chrome-os-partner:24107 TEST=Define CONFIG_WATCHDOG_HELP, and see stack trace on 'waitms 2000'. TEST=Undefine CONFIG_WATCHDOG_HELP, and check watchdog still works without printing stack trace. BRANCH=None Change-Id: I2555d3f86a15c83bb03a00c6807f77d9dddaf333 Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/178284 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>