From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Hobi <dhobi@gmx.net>
Date: Tue, 20 Mar 2007 09:52:53 +0100
Subject: [U-Boot-Users] CONFIG_HW_WATCHDOG in 1.1.6
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References: <f608b67d0703191743id58c79cjb0ff4d2fdf1975b7@mail.gmail.com>
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On 20.03.2007 01:43, vb wrote:
> I am trying to enable hardware watchdog in version 1.1.6 on an 85xx
> based platform.
> 
> I added CONFIG_HW_WATCHDOG definition to include/configs/<platform>.h
> and provided the hw_watchdog_reset() function. The image compiled and
> linked nicely, but once I run it in u-boot CLI (monitor) mode - it
> gets killed by the watchdog in no time.

The 85xx seems to support a timer interrupt based hardware watchdog 
model by enabling CONFIG_WATCHDOG (note the difference to your define). 
Have a look at these functions:

cpu/mpc85xx/interrupts.c: timer_interrupt
cpu/mpc85xx/cpu.c: reset_85xx_watchdog

Maybe these fit your need?

Best Regards,
Daniel