Yes, that's exactly what I need. And yes, I'm used to IAR and others, where this is possible. I wanted to find out if it is possible to do this with gcc, I really did not expect any problem with this. I thought that I just have not found the right documentation... :-(
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of TODD BATZLER Sent: Thursday, December 20, 2007 4:32 PM To: avr-gcc-list@nongnu.org Subject: Re: [avr-gcc-list] Howto put constants on fixed address You've now found yourself exactly where I did. I wanted to bury a software part number at 0x100 in the flash so a 'universal' programming 'pod' could look in this specific location of the hex file and determine if the target was valid for an upgrade regardless of what AVR was implemented on the target board. Best I could do is define my own section at 0x100 leaving the bytes below unused. It appears that the gcc linker is not able to wrap code around this reserved section like the IAR linker can and utilize the space above and below 'my section'. >>> <[EMAIL PROTECTED]> 12/20/2007 9:09 AM >>> Thanks for the links, but that is not exactly what I am looking for. Using this document I was able to create output like this: 0x0000-0x008F .vectors 0x0090-0x03FF gap 0x0400-0x041F my section 0x0420- rest of the .text section The gap is empty - it's waste of the flash space. I have not found if it is possible to put my section to any address and let linker to "flow the .text section round it", it seems to me that it is not possible, but I don't know why - the linker should be able to do this, it's not a difficult task... ______________________________________________________________ > Od: [EMAIL PROTECTED] > Komu: Martin Ĺ̋iĹžka <[EMAIL PROTECTED]> > CC: avr-gcc List <avr-gcc-list@nongnu.org> > Datum: 20.12.2007 01:12 > Předmět: Re: [avr-gcc-list] Howto put constants on fixed address > >On Dec 19, 2007, at 5:03 PM, Martin Žižka wrote: > >> Yes, that will place the .length segment between .vectors > and .progmem. But >> you are unable to place it to some exact address. That will place it > to >> address that is offset_of(.vectors)+length_of(.vectors). That can be >> different for some cpus. > > >I think this URL describes the syntax to do what Martin is looking to do: >http://www.gnu.org/software/binutils/manual/ld-2.9.1/html_node/ld_21.html#SEC21 > >More hints here, in that one can edit the . address: >http://www.gnu.org/software/binutils/manual/ld-2.9.1/html_node/ld_10.html > >-- >David Kelly N4HHE, [EMAIL PROTECTED] >======================================================================== >Whom computers would destroy, they must first drive mad. > > _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
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