TFTP boot of a bare-metal program on imx53-QSB

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I'm working on a bare-metal program on my imx53-QSB. I wrote de program and build it correctly and succeeded to boot it form the SD card. But now I want to boot using TFTP. I put U-Boot on my SD card, and created my TFTP server on my computer in which I put my boot file kernel.imx I transferred after that my file to the board using

tftp 0x90000000 kernel.imx

done Bytes transferred = 11264 (2c00 hex)

After that I try to boot using the kernel.imx that i transferred using

go 0x90000000

but it stays stuck in this message : ## Starting application at 0x90000000 ...

I also tried using kernel.elf, kernel.img and kernel.bin

Any idea of how to solve this ? Thanks

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