I think this is very possible from a suitably written custom SD boot option 
but you are going to have to write your own drivers to do this. 

>From what I can tell, the A20 looks on the SD for a boot partition so if 
you can create your own boot you could do this. Trouble is, I don't know if 
there is much information on the internals of Phoenix Suite.

I have not seen anything off the shelf to do this.

I have an older FriendlyArm board that looks for a certain partition on the 
SD that can the programme the NAND from SD.

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