[U-Boot-Users] CFG_LOAD_ADDR vs. CONFIG_LOADADDR vs. CFG_TFTP_LOADADDR

What's the difference between CFG_LOAD_ADDR and CONFIG_LOADADDR? Looking at the code, it looks like their both used as default load addresses, but I don't see why they should have different values (they do in most header files).

The README also talks about CFG_TFTP_LOADADDR, but I don't see where that's used in the code.