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 > AVR-GCC-list@nongnu.org > http://lists.nongnu.org/mailman/listinfo/avr-gcc-list > > -- View this message in context: http://old.nabble.com/avr-objcopy-not-copying-custom-section...-tp31011415p31011953.html Sent from the AVR - gcc mailing list archive at Nabble.com. _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list