Memory maps and segmentation

Relocatable Code Sections are placed in the DEFAULT_ROM or .text Segment.

Relocatable Data Sections are placed in the DEFAULT_RAM or .data Segment.

Note: The .text and .data names are only supported when the ELF object file format is used.

There are no checks at all that variables are in RAM. If you mix code and data in a section you cannot place the section into ROM. That is why we suggest that you separate code and data into different sections.

If you want to place a section in a specific address range, you have to put the section name in the placement portion of the linker parameter file, as listed in the following listing:

Listing: Example assembly source code


SECTIONS
  ROM1       = READ_ONLY  0x0200 TO 0x0FFF;

  SpecialROM = READ_ONLY  0x8000 TO 0x8FFF;

  RAM        = READ_WRITE 0x4000 TO 0x4FFF;

PLACEMENT

  DEFAULT_ROM   INTO ROM1;

  mySection     INTO SpecialROM;

  DEFAULT_RAM   INTO RAM;

END