Hello After changing the driver code, which is configured as module, I am compiling with the commands make modules make modules_install And then adding the newest module into the running kernel. But the problem is it is taking too much time( i.e it is compiling so many files). Is there any way by which only the changed code is compiled added into the running kernel. 2) I want to learn writing modules, is there any docs,web sites that gives information about the modules. Thanks in advance shashi ----------------------------------------------------------------------- LIH is all for free speech. But it was created for a purpose - to help people discuss issues about installing and running Linux. If your messages are counterproductive to this purpose, your privileges to submit messages can and will be revoked.