loading the u-boot

Hi,
    When if we are loading the u-boot into Beagle board rev C5 through
JTAG through code composer studio 5.1 does it goes to the directly to
the NAND flash or to the RAM . I tried in loading the u-boot elf file
in to the beagle board through JTAG. It is loaded successfully. But
when i am rebooting the board it is showing the old u-boot not new u-
boot which i loaded through JTAG.

Thanks
bhimesh