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Linux/TDA2EVM5777: Nor flash boot of TDA2x EVM (with linux OS) has something wrong. What are the problems? Please help me!

Part Number: TDA2EVM5777

Tool/software: Linux

Booting from nor flash which I did consists of the following steps:

1. First :

set the SW2+SW3+SW5 for SD boot:

2. SECOND:

I used SD boot to entry the boot environment, download the uboot.bin(from PROCESSOR_SDK_VISION_03_00_00_00/ti_components/os_tools/linux/u-boot/u-boot) to 0x0800 0000 via tftp.

POWER off the EVM.

3.THIRD:

set the SW2+SW3+SW5 for NOR(XIP) boot, and POWER on the EVM:

But the output of UART is nothing! Why?