Re: [avr-gcc-list] Patching EEPROM image for production

[Ned Konz]

dimax un wrote:
> Hi Folks,
>
> I'm trying to find clean solution for the following system problem.
> I have configuration structure in EEPROM:
> struct VPD_t
> {
>   char sn[10];
>   char id[20];
> }VPD EEPMEM;
>
> While linking I generate EEPROM image in lets say VPD.eep file.
> For production purposes I need to burn every product with different sn
> and id. So I have to patch VPD.eep all the time.
> I'm trying to make a script that has VPD.eep sn and id on it's input
> and generates VPS_sn.eep with patched sn and id on it's output.

Why not just program it in two (or more) pieces using a single script?

Unchanging VPD.eep programmed first; doesn't program the area for the SN
and ID numbers.
Then generate the SN/ID on the fly and burn it into the right place.

You can reserve space in your main program for it and know where it is
by using a named linker section for it and using the section pragma to
place it in the right place.

avrdude is good for this.