[U-Boot-Users] AT91 with u-boot-1.1.3

[kentropy]

Hi,
I am u-boot newbie, and I have a AT91rm9200DK board with u-boot 0.3.2 preinstalled by the vendor.
I'd like to update it with version 1.1.3
So I started following this example http://sourceforge.net/mailarchive/message.php?msg_id=9951989
where a newer u-boot can be launched by a older one

 > 	cd u-boot-0.4.0; \
 > 	echo TEXT_BASE = 0x21fa0000 > board/at91rm9200dk/config.mk; \
 > 	make at91rm9200dk_config; \
 > 	make; \
 > 	cp -f u-boot.bin /tftpboot
 > 
 >   And then from u-boot I do:
 > 
 > tftp 21fa0000 u-boot.bin # load u-boot
 > go 21fa0000			   # run u-boot

but when I launch > go 21fa0000 
the system freezes.
Can I do what I am doing or u-boot have to be stored in flash ?
TIA