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It's difficult to debug problems with single watchdog warning. This patch will print IPC and LP registers continually if watchdog warning is fired. BRANCH=None BUG=b:79733639 TEST=waitms 1000, EC print warning message but no reset. waitms 3000, EC print warning message and then reset. On bip, EC is powered by servo only. And we got the following watchdog warning message: And we refer to assembly code, the IPC indicates CPU is executing instructions in "gpio_get_level()" (IPC:00002408, IPC:00002404, IPC:000023fc, IPC:0000240e), and calling from "chipset_pre_init_callback()" (LP:0000101e). Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Pre-WDT warning! IPC:00002404 LP:0000101e Pre-WDT warning! IPC:000023fc LP:0000101e Pre-WDT warning! IPC:0000240e LP:0000101e Pre-WDT warning! IPC:00002408 LP:0000101e Change-Id: I9e9429806db448624a10c348bee9c6e3d0a7765b Signed-off-by: Dino Li <Dino.Li@ite.com.tw> Reviewed-on: https://chromium-review.googlesource.com/1060937 Reviewed-by: Jett Rink <jettrink@chromium.org>