Saqlain: Thanks for your guide. I'll do more search. ------------------ Tao Jiang (姜涛) 2013-08-20 ------------------------------------------------------------- 发件人：Saqlain Abbas <saqlain.abbas.7@xxxxxxxxx> 发送日期：2013-08-20 11:28 收件人：Tao Jiang (姜涛) 抄送：kernelnewbies 主题：Re: Re: Need help on understanding hardware detection I believe "CPU through an interrupt" is correct, dude there is lot material on Google on this topic, just try to search using terms "how kernel detect a hardware" or "kernel plug and play" etc, try to use different queries and you will find lot of stuff. Cheers, On Tue, Aug 20, 2013 at 6:46 AM, Tao Jiang (姜涛) <jiangtao.jit@xxxxxxxxx>wrote: > Saqlain: > Thanks for your reply. > The article really opened my eyes. > But in that article wrote as > 1. " Linux kernel constantly scans all your computer bus’es for any > changes and new hardware. Once any change on any bus is detected magic > begins " > And in the comments at the bottom, > 2. "a bus controller notifies the CPU through an interrupt which > allows the kernel to query the controller back for information" > So my question is which one is right? > And can you show me more details on Linux kernel's implementation > about "constantly scans" or "notifies the CPU through an interrupt"? > > ------------------ > Tao Jiang (姜涛) > 2013-08-20 > > ------------------------------------------------------------- > 发件人：Saqlain Abbas <saqlain.abbas.7@xxxxxxxxx> > 发送日期：2013-08-19 19:53 > 收件人：Tao Jiang (姜涛) > 抄送：kernelnewbies > 主题：Re: Need help on understanding hardware detection > > have a look at http://blogas.sysadmin.lt/?p=141 will give you a nice > idea... > > Cheers, > Saqlain. > > > On Mon, Aug 19, 2013 at 4:47 PM, Tao Jiang (姜涛) <jiangtao.jit@xxxxxxxxx > >wrote: > > > Hi All: > > I did some search on "how does linux kernel detect hardware?" and > > got what udev is. > > I konw Linux kernel will send a netlink message to udevd. > > But I still do not understand how the kernel can decide to send a > > netlink message. > > What happend before the netlink message? > > Take an usb stick for example, what will happen and what the > > kernel do from the very beginning of it been plugged in? > > Thank you for advance. Any references will be appreciated. > > > > -------------- > > Tao Jiang (姜涛) > > 2013-08-19 > > _______________________________________________ > > Kernelnewbies mailing list > > Kernelnewbies@xxxxxxxxxxxxxxxxx > > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > > > > -- > Kind Regards, > Saqlain Abbas. > > > -- Kind Regards, Saqlain Abbas. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
