Building a ROM Image

The CodeWarrior compiler and linker can generate a program image that may be stored in and started from ROM (read-only memory). This section uses the term ROM to mean any kind of persistent main storage, including ROM and flash memory.

To create an image for read-only memory, you must configure the compiler and linker:

• Linking a ROM Image
  Configuring rogram for loading into and running from ROM.
• ROM Image Addresses
  The program ROM image is usually the whole image of the program. The ROM image allocates RAM space for its variables, and optionally for its executable code, at application startup.
• Specifying A Single ROM Block
  When specifying a single ROM memory block in a .lcf file, the start address of this memory block can be used as ROM image address.
• Specifying Several ROM Blocks
  To specify several ROM blocks in a .lcf file, the start address of the main memory block must be the ROM image address.
• Specifying Jump Table Location
  By default the CodeWarrior compiler and linker allocate jump tables for switch statements in RAM. When the application executes from ROM, it is sometimes better to have the switch table allocated in ROM to reduce RAM requirements.
• Specifying Constant Data Location
  Solutions for storing constants with sizes smaller than 8 bytes to be allocated in in the .rodata section.