In message OFFAEBF961.315F63C1-ON42256E38.003AD8E6-08256E38.003AE977@mksinternal.com you wrote:

Will this disturb u-boots operation?

Sorry, only now I realize that this was sent to the u-boot list, too.

I wrote:

Yes, you need to enable CONFIG_WATCHDOG and CONFIG_WDT_MPC8XX to get access to the features documented in Documentation/man4/wdt_mpc8xx.4

This was for Linux. If you do this, you must set CONFIG_WATCHDOG in U-Boot, too.

CONFIG_WATCHDOG in U-Boot will enable the watchdog (actually for MPC8xx it will _not_ disable it). If the watchdog is running, any software you run must make sure to trigger it, i. e. a Linux kernel without watchdog support will be reset very quickly.

Best regards,

Wolfgang Denk