How can I do this without using custom linker script? Simply placing variables into a dedicated section and locating it to absolute address with --section-start would overlap this section with other data.
2010/6/27 Ivan Dimitrov <ivan...@hotmail.com>: > you have to put all vars in one structure (or if you use only function > pointers you can pack them in array of functions) and place them in the very > begging of the RAM. This can be done with dedicated linker section. > > Regards I. Dimitrov > > > >> From: and...@infoathand.com >> Date: Sun, 27 Jun 2010 00:04:22 +1100 >> To: avr-gcc-list@nongnu.org >> Subject: [avr-gcc-list] Reusing code and variables from bootloader in main >> program >> >> I have atmega64 with SD card connected. The card is used for storing >> WAV files, logs, etc. I want to add a bootloader that would upgrade >> the main program if certain file is present on the card. Using >> separate copies of filesystem library in main program and bootloader >> is too expensive in terms of flash space. I am thinking about this >> solution: link the bootloader with filesystem libraries, and in main >> program have a set of pointers to filesystem library functions in >> .noinit section. When bootloader is started , it upgrades main program >> if necessary, and then initializes the prointers with correct >> addresses and jumps to address zero, starting the main program. Since >> variables are in .noinit, main program would not initialize them, >> preserving the addresses. Obviously, main program also needs to know >> addresses of all global variables used by filesystem lib. The problem >> is : how do I make both program use same addresses for certain >> variables? >> >> _______________________________________________ >> AVR-GCC-list mailing list >> AVR-GCC-list@nongnu.org >> http://lists.nongnu.org/mailman/listinfo/avr-gcc-list > > ________________________________ > Hotmail: Powerful Free email with security by Microsoft. Get it now. _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
