Hi, > what is wrong ? you need to link to nutcrtf.a instead of nutcrt.a. Nutcrtf is the floting point version and is slightly larger than nutcrt.a Regards, Ole Reinhardt -- kernel concepts Tel: +49-271-771091-14 Dreisbachstr. 24 Fax: +49-271-771091-19 D-57250 Netphen E+ : +49-177-7420433 --