From: Mike Frysinger <vapier@gentoo.org>
Date: Wed, 26 May 2010 14:13:20 -0400
Subject: [U-Boot] [PATCH] watchdog petting during autoboot delay
In-Reply-To: <1274870089-16974-1-git-send-email-nicolas.ferre@atmel.com>
References: <1274870089-16974-1-git-send-email-nicolas.ferre@atmel.com>
Message-ID: <201005261413.22106.vapier@gentoo.org>
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To: u-boot@lists.denx.de

On Wednesday 26 May 2010 06:34:49 Nicolas Ferre wrote:
> --- a/common/main.c
> +++ b/common/main.c
> @@ -159,6 +159,7 @@ static __inline__ int abortboot(int bootdelay)
>  	 * when catch up.
>  	 */
>  	do {
> +		WATCHDOG_RESET();	/* Trigger watchdog, if needed */
>  		if (tstc()) {
>  			if (presskey_len < presskey_max) {
>  				presskey [presskey_len ++] = getc();
> @@ -251,6 +252,7 @@ static __inline__ int abortboot(int bootdelay)
>  # endif
>  				break;
>  			}
> +			WATCHDOG_RESET();	/* Trigger watchdog, if needed */
>  			udelay(10000);
>  		}

if your udelay() implementation isnt calling WATCHDOG_RESET(), it is broken.  
yes, this is undocumented, but search the mailing archives for examples.

i believe the same goes for serial devices and their tstc() function.
-mike
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