The core CHDK code now include some changes made for EXMEM (changeset 1124), including the code to build and load CHDK itself into the EXMEM memory space. This article describes setting up, testing and using EXMEM including loading CHDK itself into this memory. Also see for additional information. It is based on work done on the G12 & SX30 ports. First here's a simplified memory map for recent dryos cameras like the G12 & SX30 (not to scale). The numbers are in HEX, the question marks are values that change from camera to camera: 3. Define a value for EXMEM_HEAP_SIZE. Step 3. Step 4. Step 5.