Dear Prchal Jiří,
> This fixes floating pin PB14 (DRXD) if it is unconnected, witch cause 
> sometimes to stop autoboot by receiving char 
> (noise). It turns internal pull up on this pin.
> It turns pull up on all other pins where should be pull up and is set in 
> driver too.
> 
> Signed-off-by: Jiri Prchal <jiri.prc...@aksignal.cz>
> 
> --- u-boot-2010.09/include/configs/at91sam9260ek.h.orig       2010-09-28 
> 23:20:55.000000000 +0200
> +++ u-boot-2010.09/include/configs/at91sam9260ek.h    2011-04-27 
> 08:05:16.231133740 +0200
> @@ -55,6 +55,7 @@
>    * Hardware drivers
>    */
>   #define CONFIG_AT91_GPIO    1
> +#define CONFIG_AT91_GPIO_PULLUP      1
>   #define CONFIG_ATMEL_USART  1
>   #undef CONFIG_USART0
>   #undef CONFIG_USART1
This is based on old code.

Anyway, the Pull-Ups are enabled in the current (not yet in mainline) 
at91sam9260ek port.

Best Regards,
Reinhard
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