defining memory addresses

[Jan Van Belle]

       Hello all,

       I wonder how I can tell the compiler how many memory he has on
the target board.
e.g:
512kb ROM
3MB RAM

ROM starts at 0x0000, containing the program code (boot-loader/monitor
program). The codesize is (much) smaller than 512kb. How does the
compiler know he cannot store variables in that area??

Related to this: how can I effectively use the internal RAM?
The target is (will be) an Atmel AT40800 arm7tdmi processor, the
compiler arm-elf-gcc .

Regards,

     Jan
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