Hi , I am working on a multi tasking application to debug which I am using ARM AXD debugger .The application runs on an ARM9 board with ecos as the OS. The image is an .axf(arm executable format) file. The problem I am facing is when i try doing the stepping, the debugger says " Unrecognised SWI ". Kindly let me know what could be the problem ASAP. Thanks in advance. Regards, JPR