On Thu, Feb 21, 2013 at 7:53 AM, ehuijben <evert.huijben@xxxxxxx> wrote: > Assembler messages: > Error: unknown cpu `cortex-m0' > Error: unrecognized option -mcpu=cortex-m0 > make: *** [gdr216-01xx.elf] Error 1 Thanks. No wonder these errors messages looked odd. They are coming from the assembler, not the compiler. You need to build a newer version of the assembler. It looks like support for cortex-m0 was added in GNU binutils version 2.20. Ian