The Raspberry Pi (model B) ships with 256M of memory. This memory is split between the ARM and GPU halves of the System-on-a-Chip (SOC). You can change the memory allocation by selecting a different start.elf program:

* For a 192M ARM / 64M GPU split (general computing): <code>cp /boot/arm192_start.elf /boot/start.elf</code>

* For a 224M ARM / 32M GPU split (simple display): <code>cp /boot/arm224_start.elf /boot/start.elf</code>