On Thu, Oct 09, 2014 at 07:32:51AM +0200, Alistair Gadd wrote: > Hi Everybody, > > I'm hoping this is an easy one for someone out there. > > I'm putting together a bootloader for an ATmega328P using Atmel Studio 6.2 > and I would just like to ask if there is an easy way configure the IDE so > that I can have separate sections that I can allocate code to. I have been > using "-Ttext 0x7000" as a linker flag in "Configuration > Manager->Toolchain->AVR/GNU Linker->Miscellaneous", which places all the > code starting with reset vector at 0x3800 onwards, but I would like to have > another section in the application section where I can place an SD card > library that will be accessible by the bootloader and by future > applications. > > I have defined another "FLASH segment" - ".sdlib=0x2000" in "Configuration > Manager->Toolchain->AVR/GNU Linker->Memory Settings, but I don't know how to > configure .c source files and assembler .s files so that their code is > allocated to this segment. > > Can anybody give me some ideas on how I could achieve this?
There are a couple of ways. 1. Create a linker script that groups code from specific object files into custom output sections. Something like .sdlib : { foo.o(*.text) } where foo.o is the object file containing the code to go into the section. 2. Use attributes in C code and .section directives in assembler code to specify the section. void __attribute__((section(".sdlib"))) my_function() {} int main() { return 0; } This makes the place the my_function's code in a .sdlib section. main's code still goes into .text. Hope this helps. Regards Senthil _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org https://lists.nongnu.org/mailman/listinfo/avr-gcc-list