[U-Boot] Download the u-boot from flash back to PC

I have a board which has a version of u-boot on it that I would like to save before overwriting. I did not flash this version so I do not have the source code for it.

I am trying to figure out is there away to essentially do a 'tftp get' of the u-boot.bin that was originally written to flash. I do not see any methods to "read" data from U-boot back to the PC. Is there any method to do this?