RE: [avr-gcc-list] initialized progmem data at fix address

[Larry Barello]

It is a limitation of the current dwarf-2 support in Astudio.  It only loads
".text" segments and ignores all others.  It will be very nice when dwarf-2
support is fully fleshed out and working (particularly for >64k memory).

You can put named segments anywhere, but, as noted above, astudio won't load
them.  You can put your PROGMEM stuff into it's own C file and then arrange
the link list ($OBJ) to locate your flash data, but that just allows you to
specify the order, not a particular location.

-----Original Message-----
From: address@hidden
[mailto:address@hidden Behalf Of
Gaël Rossignol
Sent: Thursday, May 26, 2005 6:51 AM
To: 'address@hidden'
Subject: RE: [avr-gcc-list] initialized progmem data at fix address


Hi,

When I use the method under, to declare somme objets in the flash program
memory, I can see the object in the .hex file whith AVR STUDIO 4.11 SP3, but
it dont work whith the .elf file. Is that a bug of AVR STUDIO?

If I use PROGMEM of the pgmspace.h header that is all correct but the memory
object is placed before program code. Can I put this anywhere?

Thank to answer.

-----Message d'origine-----
De : Eivind Sivertsen [mailto:address@hidden
Envoyé : jeudi 14 avril 2005 10:15
A : Martin Bammer
Cc : address@hidden
Objet : Re: [avr-gcc-list] initialized progmem data at fix address


Hi,
I dont know if the #pragma option works, but I know you can do this
(e.g. in your main .c file):

// 1) Define the segment.
#define FLASHDATA __attribute__ ((section (".flashdata")))

// 2) Declare the data array.
const unsigned char data_array[] FLASHDATA = {0xd9, 0xce, 0xe3, ...,
...etc, etc};


Then add this linker command under the others in the makefile:

LDFLAGS += -Wl,--section-start=.flashdata=0x1E800


Cheers,
Eivind



>Hi,
>
>use: #pragma yoursection="ANYNAME"
>
>then in your makefile write:
>ANYNAME_ADDRESS = 8000
>LDFLAGS += -Wl,--section-start=.text=$(ANYNAME_ADDRESS)
>
>Attention: gcc understands 8000 as BYTE address!
>
>
>
>>hi,
>>
>>how can i create an initialized progmem data at fix address in program
>>flash in C?
>>
>>  ie.: bootloader version number:
>>  uint16_t version;   // at address 0x1E800
>>
>>thanks: Andras
>>
>>
>>
>>_______________________________________________
>>AVR-GCC-list mailing list
>>address@hidden
>>http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
>>
>>
>
>
>_______________________________________________
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>address@hidden
>http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
>
>
>



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