When my CHOCHI (http://forum.6502.org/viewtopic.php?f=10&t=2644) boards start up, they contain a binary loader that flashes an LED (to indicate that the system is up) and waits for a binary upload via the serial port. The protocol is very simple:

-A 2-byte load/execution address
-A 2-byte byte count (actual code, excluding this 4-byte header)
-data...

The original loader code was sitting high up in page $FF and used $FFFC/$FFFD to store the load/execute address initially received (I thought I was clever). This worked pretty well, but while trying to port ehBASIC I realized that my arrangement is not very smart.

I like the ability to load right over high RAM and vectors. That means that the loader should not be in page $FF, and it should not use the reset vector to store the load/execute address.

Where to put it? I stuck it into page 0! There is really no need to load anything into page 0, and it's a safe until the code starts executing (at which point it will overwrite it). I shall also move the 2-byte address to a page 0 location. I am a little concerned as I am feeling clever again

I am doing some final adjustments and tests. I will be posting a bitstream update soon here:
http://apple2.x10.mx/CHOCHI/#Bitstreams

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In theory, there is no difference between theory and practice. In practice, there is. ...Jan van de Snepscheut

Another clever solution would be for the loader to write to 64KB free space in external SRAM. When the loader is done, it does some magic memory remapping to expose that 64KB RAM area as the 6502 memory space.