If you want to use your own linker script, your best reference is the
ld manual at http://sourceware.org/binutils/docs-2.21/ld/Scripts.html#Scripts
You will probably need to define a new linker section, put it in
REGION_TEXT, and make sure it's aligned to a flash block boundary. So
you need to modify one or more of the msp430*.x scripts, and probably
not the memory.x script. I believe you can use -L to provide an
alternative path to custom linker scripts outside the mspgcc
installation area.
Preventing your flash programmer from wiping that section will
probably be a challenge.
Alternatively, use the information memory sections on your chip, if
they're large enough and not reserved for something else. I think
there are some examples in the old mspgcc manual that aren't
completely out of date: in essence, define the data structure with
__attribute__((section(".infomem"))).
Peter
On Thu, Sep 1, 2011 at 7:06 PM, Sergio Campamá <scamp...@ing.puc.cl> wrote:
> Hello,
>
> I'm sorry to bother you again, but I really don't know where to look. This
> sort of stuff is not taught anywhere I know.
>
> I am designing an app that has to store data in the msp430's flash. Looking
> at the following post:
>
> http://e2e.ti.com/support/microcontrollers/msp43016-bit_ultra-low_power_mcus/f/166/t/18663.aspx
>
> I realized that I can customize the memory mapping when compiling, so I
> thought I could customize it to leave a segment of 512 bytes just for storing
> our user data. The post says something about a cmd file, but I think that it
> translates to the memory.x file for mspgcc.
>
> The specific questions are: how can I reserve a flash memory segment for
> storing these values? How can I load the custom memory.x without modifying
> the original in the mspgcc folder? Is there a way to save that segment from
> being erased when programming a new firmware? Is there a similar syntax to
> the #pragma DATA_* in the previous post?
>
> Thanks for any help I can get, I am truly lost.
> ---------------------------------------
> Sergio Campamá
> sergiocamp...@gmail.com
>
>
>
>
>
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