hi Thanks for ur reply! Now i want to run the example as the screenshots shows un the page: http://sources.redhat.com/sid/screenshots/run-dhrystone.jpg But i don't know howto build an toolchain like arm-elf-sid which was used in the screenshots, would u please show me how to build this toolchain? I'm sorry to ask such a question as it seems it's not about SID, but I didn't know quite much about this. :-( Very glad to get ur reply. Thanks for ur help! Dam. Wang _________________________________________________________________ ÓëÁª»úµÄÅóÓѽøÐн»Á÷£¬ÇëʹÓà MSN Messenger: http://messenger.microsoft.com/cn