Jaga 
Hi Frnds, I'm using Linux kernel version linux-2.6.32.2, and arm-gcc-linux from FriendlyArm site.... i've expoted the path $ export PATH=$PATH:/home/jaga/Desktop/linux/opt/FriendlyARM/toolschain/4.4.3/bin/ and then compiled the linux source by giving command $ make ARCH=arm CROSS_COMPILE=arm-linux- after compiling for few minites i got this message..... /**************************************************************/ CHK include/linux/version.h make[1]: `include/asm-arm/mach-types.h' is up to date. CHK include/linux/utsrelease.h SYMLINK include/asm -> include/asm-arm CALL scripts/checksyscalls.sh CHK include/linux/compile.h CC [M] drivers/input/touchscreen/eeti_ts.o drivers/input/touchscreen/eeti_ts.c: In function 'eeti_ts_irq_active': drivers/input/touchscreen/eeti_ts.c:64: error: implicit declaration of function 'irq_to_gpio' make[3]: *** [drivers/input/touchscreen/eeti_ts.o] Error 1 make[2]: *** [drivers/input/touchscreen] Error 2 make[1]: *** [drivers/input] Error 2 make: *** [drivers] Error 2 /*************************************************************/ whats the problem....?? please help me to solve this issue......