I am trying to put a subroutine at a fixed address (I want it to remain fixed after the code is rebuilt and other modules are changed). First I linked my code and obtained its absolute linked address (assigned by the linker). Then I used the _at_ (0x07A) command in the C source file. I got a FIXUP error when I linked. When I did the same thing using the linker SE command, I didn't get any errors. I really wanted to cast the addresses in the source C code file using the _at_ command but I am having problems.... Any thoughts... Thanks, Jim
Tom Thanks for the help and your design comments. I believe that I can locate variables and subroutines where I want them in internal or external memory. I am concerned about the library routines as you pointed out. Is it possible to get the library source and then locate subroutines and data to external memory when the application code may require these utilities? I could let the linker relocate them if this is possible. Note: This system design should not see many changes in the functional side, however the fixed side (251 onboard) will not be allowed to change once burnt into the 251. The functional code changes will be done so as not to intentionally change the onboard code image. Any thoughts on this???