Re: [ECOS] Setting breakpoints

["Eric de Jong" <list_ericdejong_10 at gmx dot net>]

>> Q: What section do I place the functions in question into?

After compiling ecos as a library, you will find a linker file called
"target.ld" in the ./install/lib directory. Edit it and add an extra text
section to it, say .ramtext
Then, you can place your code in it. As you do an "objdump -h" to your compiled
program, you will see something like this:

 11 .text         00022ab4  00012044  00012044  000000e4  2**2
                  CONTENTS, ALLOC, LOAD, CODE
 13 .bss          00006d4c  00034af8  00034af8  00022b98  2**5
                  ALLOC
 18 .data         00010b84  02044878  02044878  00027410  2**2
                  CONTENTS, ALLOC, LOAD, DATA

notice that the .data section has attribute DATA, and .text has attribute CODE
When you create an extra section .ramtext and place a function in it, it should
get the CODE attribute. Now there are two importand things:

1) be sure to set the LMA address in rom/flash and the VMA address to ram.
Please read the info documentation of ld on how to do this.("Output section
LMA")
2) before a function in .romtext is called, the .romtext section must be copied
from flash to ram first! Do this from a function which is NOT in ram. See also
the info documentation.

You might experience problems with the linker file, as the addresses must be
sequential (haven't figured that out myself yet :). Put the extra .ramtext
section after the .text section or reset the location counter with the line
. = 0x12000;
of course, use your own valid address

Eric



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