On Mon, 2025-01-13 at 17:37 +0800, Chin-Ting Kuo wrote: > The boot status in the watchdog device struct is updated during > controller probe stage. Application layer can get the boot status > through the command, cat /sys/class/watchdog/watchdogX/bootstatus. > The bootstatus can be, > WDIOF_CARDRESET => System is reset due to WDT timeout occurs. > Others => Other reset events, e.g., power on reset. > > On ASPEED platforms, boot status is recorded in the SCU registers. > - AST2400: Only a bit is used to represent system reset triggered by > any WDT controller. > - AST2500/AST2600: System reset triggered by different WDT > controllers > can be distinguished by different SCU bits. > > Besides, on AST2400 and AST2500, since alternating boot event is > also triggered by using WDT timeout mechanism, it is classified > as WDIOF_CARDRESET. > > Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@xxxxxxxxxxxxxx> Reviewed-by: Andrew Jeffery <andrew@xxxxxxxxxxxxxxxxxxxx>
