[U-Boot] why the u-boot have no upload command?or there is another way to upload data to host?

[IaMaPlAyEr]

hi all:


I do like to ask a question, why u-boot have no upload command?
image such a scene:
 you have two board, and develop with one, but to some unknow reason, the
board cannot boot.
maybe it is the hardware problem, you want to upload all the data---a bin
file, and download it to
another board.

maybe tftp should the upload function? or there is another way to upload
data to host?

thanks for reading!

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Sincerely,

HaveF