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AM5728: U-boot UART download fails

Part Number: AM5728

Hi,

Now, I'm using am5728 on my board, I want to download u-boot to it.but I have a trouble.

when I use JTAG to debug u-boot,it can run:

But when i use uart to download, there is a problem: the u-boot-spl.bin file can download successfully using Perl, and seeing "CCC", then  I send the u-boot.img file, but it stay here and no longer run:

why? can you help me?

thank you.