Re: [avr-gcc-list] How not to use special memory area

[Adib Taraben]

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Hello Erik,

let me clarify:
yes, the internal RAM goes until 0xfff.
But there is an external SRAM connected to the AtMega103. The size of 
the RAM is 64kB. The RAM is via glue-logik selected in the memory area 
0x2000-0xffff.
The area from 0x1000-0x1fff is used for external IO-Chips.

I see the linkerscript from the ldscrips directory avrmega103.x etc.
I have no glue how to extend the data section, so that it has a hole 
from 0x1000-0x1fff.

Any help appreciated,

Thanks,

Adib.

Erik Christiansen wrote:
> On Thu, Mar 18, 2004 at 02:21:40PM +0100, Adib Taraben wrote:
>
> > On my board (ATMega103) there is the area from 0x1000 to 0x1fff used for 
> > special IO chips. The CS is generated via GALs.
> > Now I am afraid that the compiler put some variables in that area. How 
> > can I prevent this?
>
>
>
> AFAIK, the ATMega103 RAM ends at 0xFFF, so a correctly set up linker
> script should only allocate that much, and an attempt to pour in more
> Spaten than a maß holds should result in an error like:
>
> avr-ld: address 0x801000 of app.elf section .bss is not within region data
> or
> avr-ld: address 0x801000 of app.elf section .noinit is not within region data
>
> To check, have a look at your linker script, or simply declare larger
> arrays until the error is triggered. Then you'll know if it knows what
> you know.
>
> Regards,
> Erik

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