Re: Initialise data

Most likely the data is not being moved to RAM because it is declared
'const' or it is never modified in your code so is implicitly declared
const by the linker and hence not moved to RAM. If this is the case,
and your code does not currently access the data you are interested
in, then if you put a dummy function in modify the variables values
(and use the modified value to avoid optimisation complications) at
run time and rebuild. You should then find that the data you are
concerned about is relocated to RAM at startup to allow the code to
modify the values.

Another possibility is that there is simply an error in your linker
command file, specifying allocation of the various sections.

If you are after locating this data in RAM because you want them to be
accessed by another piece of code that is not statically linked
against the code unit that declares the variables, i.e. effectively
dynamically linked then you will either need to use some off the shelf
 RTOS library or invent something yourself which manually locates the
 data. (Pragmas to put the variables concerned in a new linker section
 located where you want may be sufficient, depending on your compiler)

--- In [email protected], "Azkarate_Askasua Mikel"
<mazkarateaskasua@i...> wrote:
>
> Hello,
> 
> We want to declare some variables out of any function (on header)
and just initialise them.
> 
> They are put in some sections on RAM (as .data etc.) and obviously
it can't be downloaded by the flasher.
> 
> There is a function in __start.c called __init_data() that copies
sections using a table (_rom_copy_info[]), but in this table the
origins and target are of each section are the some, so no copy is made.
> 
> I'm using MPC564 with Codewarrior v8.1.
> 
> *What I want to ask is how we could put it in RAM and how we can
then copy it to the proper RAM addresses.
> *Must we change the origin of .data in the linker command file? How?
> 
> Thanks.
> 
> Regards,
> Mikel A-A
>






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