Re: [avr-gcc-list] How to define a ROM data in a perticular address?

[dimax un]

Hi.

 

.org will not work for sure as it is effective inside the section.

 

As far as I understand to do it using special (your own) section you will have to change linker scripts.

You can take as example "eeprom" (or any other fixed) section and see how it is created and placed in address space.

 

 

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On 4/24/06, Ruwan Jayanetti < address@hidden> wrote:

Hi,

I tried this before trying .org but failed. I may be doing something wrong.

In Makefile added:
LDFLAGS += -Wl,--section-start=.flashparams=0x100

In the program C code:
uint8_t fFlashParams[]  __attribute__ ((section (".flashparams"))) =
"Hello World";

@ compilation it fails:
....
\WinAVRnew\bin\..\lib\gcc\avr\3.4.3\..\..\..\..\avr\bin\ld.exe: section .text [0
0000000 -> 000001b3] overlaps section .flashparams [00000100 -> 0000010b]
make: *** [demo.elf] Error 1

Complaining my memory section is overlapping with .text. I need my
memory location to be fixed within .text. Your wisdom needs in here!

TIA (Tanks In Advance),

Ruwan



On 4/24/06, Schwichtenberg, Knut < address@hidden > wrote:
> Ruwan,
> forget .org. Define a special segment and place your data into this
> segment. This will be done within the source code. Extend the linker
> command within the makefile to address the this segment (like the
> addresses for text and data segment).
>
> You will find more detailed information within the avr-libc
> documentation and also if you search for absoule adddress here.
>
> Cheers
>
> Knut
>
> > -----Original Message-----
> > From:
> > avr-gcc-list-bounces+knut.schwichtenberg= address@hidden
> > g
> > [mailto:address@hidden
> > ongnu.org] On Behalf Of Ruwan Jayanetti
> > Sent: Monday, April 24, 2006 2:53 PM
> > To: address@hidden
> > Subject: [avr-gcc-list] How to define a ROM data in a
> > perticular address?
> >
> > Hi,
> >
> > I need to define some data in a particular address in ROM (flash). Any
> > idea how can I do this?
> >
> > I tried including an assembler file:
> >
> > .org 0x80
> >
> >  .byte 0xaa
> >  .byte 0x55
> >
> > But compiler / linker don't seems to care about .org directive. The
> > bytes are getting in with other program strings defined in C, but
> > leaving a gap of 0x80.
> >
> > Thanks in advance,
> >
> > Ruwan
> >
> >
> > _______________________________________________
> > AVR-GCC-list mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
> >
>


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