hi all I am using Stellaris ware package for my application and code compilation by Gcc in Linux. At first i got error message for "_sbrk" and ".ARM.exidx" then by editing my linker script i got solved these problems. But still i am getting warning message for ".ARM.exidx part unlinked" but application get compiled. But the variables which i have used in interrupt routines are not updating when i am printing those variables its updating, when i removed printf statement its not updating. Variables which i have used are global variables. Any one could help me to solve the problem? thanks all regards vivek