[U-Boot] U-boot failed

Hello,

Please help me to configure u-boot in my NC600 board. I have reached near to u-boot, but the kernel is not booting. After the kernel image upload via serial boot mode it is giving no response. If the kernel image upload become complete it is not giving any command line in the u-boot as shown in the guide. The memory is not getting flashed. It is again booting the same old windows CE in the nand boot mode. Kindly provide me a little support for configuring u-boot.

Thanking you, Regards