The RAM region starting at 0x40000040 is used when you have to remap exception
vectors to RAM (when using a secondary booloader for example). Otherwise it
usually starts at 0x40000000.
The ROM region starting at 0x00000044 doesn't make sense. The compiler
places exception vectors starting at 0 unless instructed differently by the
.intvec section.
The size of stacks is your responsability depending on how you make your program
and how much memory do you need in those stacks.If you have a debugger it will
give you error messages if your program exceeds the size you specified in the
ICF. Still you must be aware that it's not 100% reliable and improper
dimensioned stacks WILL lead to crashes.
A good starting point in making an adequate ICF file is to take one from the IAR
examples. Something similar with what you want to do.
--- In l..., "zied130187" wrote:
>
> I begin to develop a program for LPC2129 with IAR EWARM 5.4
> I found that there is a file. ICF when I must to configure for that the linker
to the IAR generates. hex specific to my application.
> i have problem to understand how i can configure its parameters.
>
> i found an example of file .ICF in an example of project with IAR.
>
> program_in_flash.icf file in leds example provided with iar contains these
details.
>
> /*-Memory Regions-*/
> define symbol __ICFEDIT_region_ROM_start__ = 0x00000044;
> define symbol __ICFEDIT_region_ROM_end__ = 0x0003FFFF;
> define symbol __ICFEDIT_region_RAM_start__ = 0x40000040;
> define symbol __ICFEDIT_region_RAM_end__ = 0x40003FFF;
> /*-Sizes-*/
> define symbol __ICFEDIT_size_cstack__ = 0x200;
> define symbol __ICFEDIT_size_svcstack__ = 0x0;
> define symbol __ICFEDIT_size_irqstack__ = 0x100;
> define symbol __ICFEDIT_size_fiqstack__ = 0x0;
> define symbol __ICFEDIT_size_undstack__ = 0x0;
> define symbol __ICFEDIT_size_abtstack__ = 0x0;
> define symbol __ICFEDIT_size_heap__ = 0x200;
>
> according datasheet ROM_start = 0x00000000. why is declared 0x00000044 ?
> same RAM_start = 0x40000000. I don't understand why is declared
0x40000040 ?
>
> and how to initialize the sizes of the stacks?
> what criteria of choice are initialized these stacks?
> I find in other examples:
>
> they are different parameters of the first example
>
> /*-Sizes-*/
> define symbol __ICFEDIT_size_cstack__ = 0x2000;
> define symbol __ICFEDIT_size_svcstack__ = 0x100;
> define symbol __ICFEDIT_size_irqstack__ = 0x100;
> define symbol __ICFEDIT_size_fiqstack__ = 0x100;
> define symbol __ICFEDIT_size_undstack__ = 0x100;
> define symbol __ICFEDIT_size_abtstack__ = 0x100;
> define symbol __ICFEDIT_size_heap__ = 0x8000;
>
> I do not understand what I put as the size for each stack
>
