In message 4ac2955e0701220717w77b68e4dh4f08ced7ad7b0e3f@mail.gmail.com you wrote:

Can you help me to find any document/tutorial explaining "HOW TO PORT U_BOOT FOR A NEW BOARD ?" ?

YOU PROBABLY WANT TO READ THE U-BOOT README.

                                                                and

"How to port Linux for a new Board ?"

You probably want to read the Linux README.

"similarities and dissimilarities between u-boot and Linux"

The former is a boot loader, the latter is an operating system. Is this precise enough?

Any document/tutorial is welcome

You probably want to read the manual (DULG).

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And NEVER post HTML here!!!

Best regards,

Wolfgang Denk