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

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