Compiler: Linker Command File Reference

For an introduction to the linker command file, please see the article Linker Command File Primer.  For a reference, see the linker chapter in the C28x assembly tools manual.  

Martin Schleemann said:

want to use a linker command file to place a constant into memory, such as put $55AA to address $FF00 (just as an example). Does anybody know whether linker command files allow for that ?

There is a way to do it.  But it is not straightforward.  Here is one way to consider ...

#define ADDRESS   0xff00
#define VALUE     0x55aa

SECTIONS
{
   for_assignment
   {
      . += 1;
   } > ADDRESS, fill = VALUE
}

Using the #define names like that is not strictly necessary, but it makes the code easier to understand.  This creates an output section named for_assignment.  Line 8 creates a 1 word hole.  This line is C28x specific.  It presumes the linker command file counts address increments as 16-bit words, and not 8-bit bytes (which is the case for all the other TI CPU families).  This output section is allocated to the hard-coded address 0xff00.  It is filled with the value 0x55aa.

Thanks and regards,

-George