Figure B.1 shows the default memory map for the Cortex-A8 model, which is a flat 4GB memory space.

The undefined memory regions at 0x20000000 and 0xCB000000 do not cause an abort when accessed, but the return value is non-deterministic. If you set up the MMU appropriately, the Cortex-A8 can map the RAM (0x00000000 to 0x10000000) into other locations.