find start of free code space

Hello,

I need to find the beginning of free code space to use for a flash filesystem. I did not see any compiler defined symbols in the M51 file to help.

I can declare a large array in code space and use the _AT_ directive to place it high in memory but this adds considerably to emulator download time.

Or I can periodically check the symbol table for the last used code, but this can be troublesome.

I'm using the Cygnal C8051F023 if it matters.

Any ideas?

Thanks