Hi Peter, > Nick: Are you saying that the linker scripts are changing so that a global > variable definition like this: > > int myvar = 43; > > will result in myvar being stored in RAM, and no initialization of it so > the value of myvar when main starts is not 43?
No. I am saying that myvar will be stored in the .data section of the executable image and that its value in this image, will be set to 43. In addition the section header for the .data section will be set to an address in RAM, so that when the executable is loaded into the MCU's memory the correctly initialised variable will be ready to be used. What has changed is the presumption of where the executable is stored before it starts executing. Previously there was an implicit assumption that the executable would be stored in the ROM of the system and that at program startup there would have to be an explicit copying of data from the ROM image into RAM. With the current linker scripts there is an assumption that the executable is stored externally, and it is brought into system memory before execution begins. With this scenario there is no need to copy data between ROM and RAM as the data is just loaded directly into RAM. It appears however that what we need to do is to support both scenarios. I have sent a patch to this list which does most of the work - fixing the assembler and the crt0 startup code. What is missing is a new set of linker scripts, explicitly designed for ROM-resident executables. I am not sure what the best solution here will be, and I am going to wait for some guidance from TI before proceeding. There are already per-MCU linker scripts. Maybe there needs to be two sorts per MCU ? Cheers Nick ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Mspgcc-users mailing list Mspgcc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mspgcc-users
