Re: [avr-gcc-list] avr-objcopy not copying custom section...

[darkschine]

I think the problem is your section flags. Try using "xa" instead of "x"



Bill Westfield wrote:
> 
> I am trying to add a version number to my program, to be located at an
> absolute flash address.
> But it looks like I can't get avr-objcopy to copy the section that I have
> put this data in.
> 
> I have in my .C file:
> 
>      asm("  .section .version,\"x\"\n"
>     "optboot_version:  .word " MAKEVER(OPTIBOOT_MAJVER, OPTIBOOT_MINVER)
> "\n"
>     "  .word 0x1234\n"
>     "  .section .text\n");
> 
> And then I link with (for example):
> 
>       LDSECTIONS  = -Wl,--section-start=.text=0x3e00
> -Wl,--section-start=.version=0x3ffc
> 
> this seems to produce a correct .elf file:
> 
> optiboot_diecimila.elf:     file format elf32-avr
>>
>> Sections:
>> Idx Name          Size      VMA       LMA       File off  Algn
>>   0 .text         000001d6  00003e00  00003e00  00000054  2**1
>>                   CONTENTS, ALLOC, LOAD, READONLY, CODE
>>   1 .version      00000004  00003ffc  00003ffc  0000022a  2**0
>>                   CONTENTS, READONLY, CODE
>>      :
>>
>> Contents of section .text:
>>  3e00 112484b7 14be81ff d3d085e0 80938100  .$..............
>>  3e10 82e08093 c00088e1 8093c100 86e08093  ................
>>  3e20 c20080e1 8093c400 8ee0bcd0 259a86e0  ............%...
>>  3e30 20e33cef 91e03093 85002093 840096bb   .<...0... .....
>>  3e40 b09bfecf 1d9aa895 8150a9f7 99249394  .........P...$..
>>  3e50 a5e0aa2e f1e1bf2e 9dd08134 21f481e0  ...........4!...
>>  3e60 b2d083e0 1fc08234 11f484e1 03c08534  .......4.......4
>>    :
>> Contents of section .version:
>>  3ffc 02043412                             ..4.
>> Contents of section .debug_aranges:
>>  0000 24000000 02000000 00000400 00000000  $...............
>>
>>
> But objcopy seems to not include this section in output files, producing
> an
> empty hex file (data wise):
> 
> BillW-MacOSX-2<8748> /sw/cross/bin/avr-objdump -sh optiboot_diecimila.elf
> |
>> less
>> BillW-MacOSX-2<8748> /sw/cross/bin/avr-objcopy -j .version -O ihex
>> optiboot_diecimila.elf foo.hex
>> BillW-MacOSX-2<8749> more foo.hex
>> :0400000300003E00BB
>> :00000001FF
>>
> 
> Am I missing something obvious or is this some subtle bug to be tracked
> down?
> 
> Thanks
> WestfW
> 
> _______________________________________________
> AVR-GCC-list mailing list
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> http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
> 
> 

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