Kay, I am not sure if i made my self clear, what i am doing is and custom distro for an custom embedded device, which i want to have the ability to upgrade the system in runtime, which i need to ability to to stop my custom driver modules for the upgrade. So this is why i was asking what is the best way of starting and stop modules. Unless what your saying is replace the file and just reboot, instead of stop the service and replace then start it again. Pawel <div class="gmail_quote">On Mon, Mar 19, 2012 at 10:08 AM, Kay Sievers <<a href="mailto:kay@vrfy.org">kay@vrfy.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Mon, Mar 19, 2012 at 15:02, Pawel Pastuszak <<a href="mailto:pawelpastuszak@gmail.com">pawelpastuszak@gmail.com</a>> wrote: > So in this case how would you support upgrading the kernel module? > The main reason to do the module unload is so you can upgrade the module to > an new version. </div>Just do that _in_ the running service; systemd can not help with native tools to support that. Kay </blockquote></div>