ChibiOS Free Embedded RTOS

Hello,

I am porting ChibiOS to Rowley Crossworks manually (which means I am not using any of their startup files whatsoever) which uses GCC. However, I am looking through the ChibiOS repository and I cannot find the startup file for GCC. When I was in Keil using RVCT, I had the cstartup.s file that came in the repo, but with GCC I can't seem to find the assembly startup file. Am I missing something here?

Thanks in advance.

Hi,

It is not an assembler file, it is named crt0.c, look under ./os/ports/GCC/ARMCMx, probably there is no need to change anything. I recommend you use the very same files and settings found in the provided Makefiles before attempting changes.

The startup files are VERY important because the Cortex-M must be initialized in a very specific way (dual stacks, privileged mode). It is also recommended to use the provided .ld files.

Giovanni

Ok I understand now. I made it so that it used only the ctr0.c file.

Just one heads up: The linker program from crossworks expected a reset handler called "reset_handler", however the one in ChibiOS is called "ResetHandler". I manually renamed it in the crt0.c file and it built the .elf correctly. I haven't done much research as to why this is.

Hi,

You should use the vectors file (vectors.c) and scatter files (.ld) provided with ChibiOS. There is no need to rename anything.

Giovanni