Hi Erik,
Thank You for the prompt reply. But can you be more specific about the address tables.

Just wanted to clear one thing .. once the boot code verifies the correctness of App code it jumps to APPMain() and never returns unless RST.

Can you give an example of such an address table pointing to routines in External memory?

Does the App Code and Base code have to be compiled together? As of now I am compiling them as 2 different projects.

With App Code knows nothing about Internal memory (this makes it independent and can be changed anytime without effecting the base code).

Whilst the base code know nothing about the external code memory. It just reads it as a data memory (in case it needs to update it).