Increase RAM_SIZE to be used

[Joel Sherrill]

On 07/21/2011 12:06 PM, Julien Delange wrote:
> Dear all,
>
> I am currently using RTEMS 4.8 to build a new system that has a lot of
> functions. It is executed on a LEON2 platform.
>   At that time, the compiled size of the binary is more than 8Mb. When
> I try to load it on the target, I got the following error from RTEMS :
>
> bspstart: Not enough RAM!!!
>
This means your text, data, bss and configured RTEMS
objects don't fit into RAM.

Do a "sparc-rtems4.8-size" on the .exe?  How large
are the sections?

How many of what objects are you configuring?

Any configure parameters like CONFIGURE_EXTRA_TASK_STACKS
or CONFIGURE_MEMORY_OVERHEAD?
> So, I investigated and went through the sources of RTEMS and find out
> that it might be related by the configuration table of the BSP but for
> that BSP, the values taken for the RAM and other memory related
> resources are deduced from the linked script. So, I tried to change
> the RAM_SIZE of the linkcmds file included in RTEMS. Unfortunately, I
> still have the same error even when if I specify 16M as RAM_SIZE in
> the linkcmds file.
>
No.  Configuration table is part of your application.  It is
not owned by the BSP.

The BSP is only responsible for allocating RAM past the
BSS to the C program heap and RTEMS.  In this case,
it just doesn't fit.
> So, I would like to know if somebody already tried to change the RAM
> size of the BSP, especially for the LEON target. Anyway, is there
> another solution/hook that might be used to get rid of this error and
> use all the available RAM on the target ?
>
If done correctly in the linkcmds, you should be able to
override RAM_SIZE in the linker arguments when linking
the application.  Something like -DRAM_SIZE=number
> Thanks for any help regarding this topic,
>
> Best regards,
> _______________________________________________
> rtems-users mailing list
> rtems-users at rtems.org
> http://www.rtems.org/mailman/listinfo/rtems-users


-- 
Joel Sherrill, Ph.D.             Director of Research&  Development
joel.sherrill at OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
    Support Available             (256) 722-9985