[U-Boot] How to backup the working u-boot image from the flash image.

[Mohamed Thalib .H]

Hi all,
	Since I dont have the source code of u-boot image which is prgrammed in
the board. I want to know how can I back up the working u-boot present
in the flash and store it in a file in my system before flashing the new
u-boot. so the working image can used to restore the board to working
condition at any time.


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Regards,
Mohamed Thalib .H