powerpc - MPC8xx using watchdog with uboot and linux -


i have embedded platform powerpc mpc875 cpu running uboot , linux 3.2. i'd use watchdog feature of cpu. problem watchdog timed out before linux starts watchdog driver.

my cpu clock frequency 131mhz turns watchdog has max timeout of ~1 secondes (using prescaler). watchdog per default, after hard reset enabled , can once configured, therefore uboot configure , kick periodically. uboot kick watchdog before starting linux kernel.

then kernel doesn't have time load watchdog driver, take on uboot kick dog, before watchdog times out!

the watchdog driver in linux compiled in , not module able loaded earlier. loaded after being detected flat device tree.

is there other way start linux watchdog driver earlier, avoid watchdog times out ?

thanks in advance help

brice


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