Multiple Memory Regions Starting at Same Address

[Tracy dot Kuhrt at microchip dot com]

I am working on porting binutils for a new machine.  This machine has two 
distinct memory regions that both need to start at address 0.  Data will 
be placed into one memory region while code will be placed into the other. 
 Does the linker currently support multiple memory regions that start at 
the same address but contain different information?  If so, how would I go 
about specifying this in a linker script file?  If not, are there any 
thoughts on how much work would be required to make this change?  I am not 
asking anybody to do this, rather I am asking if there are any thoughts on 
what sort of things I would need to look out for if I were to make this 
change, and if the feeling is that it would require a major rewrite.

Tracy