From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcel Date: Mon, 10 May 2010 22:56:47 +0200 Subject: [Buildroot] mdev In-Reply-To: <87hbmf4i6z.fsf@macbook.be.48ers.dk> References: <201005102040.46995.korgull@home.nl> <87hbmf4i6z.fsf@macbook.be.48ers.dk> Message-ID: <201005102256.48413.korgull@home.nl> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hi Peter, Thanks for your reply. I checked out devtmpfs and will try that. It looks promising. For some reason assigning a fixed major to my devices stopped working. I still used this with the 2.6.28 kernel but now with the 2.6.33 it just won't work. Perhaps I missed something to why this doesn't work. Best regards, Marcel > >>>>> "Marcel" == Marcel writes: > Marcel> Hi, > > Marcel> I'm trying to create a couple of device nodes in /dev and > Marcel> somehow doing this manually seems not preferred so I'm trying > Marcel> to do this via mdev. > > Marcel> My first question is whether I'm on the right track by using mdev? > > Yes, that's certainly an OK approach. For an even easier setup have a > look at devtmpfs in the kernel. > > Marcel> I tried mdev but I can't make it work. Probably this is because > Marcel> I have something wrong in either the startup code , the > Marcel> mdev.conf file or whatever. Second I wonder how mdev works > Marcel> because I think it needs MAKEDEV or something else) which I may > Marcel> be missing and can't find in my buildroot. mknod is on my > Marcel> system though. mdev -s starts and returns after a second or > Marcel> so, I see no errors and no other feedback. > > Ok, good. To generate device nodes at runtime you then need tell the > kernel to use mdev as the hotplug agent. See > target/generic/target_busybox_skeleton/etc/inittab for an example of a > working setup. > > Marcel> I am looking for an example that works with spidev. My guess is > Marcel> that the entry in mdev.conf should be something like : > > Marcel> spidev 0:153 0660 > > In general you only need entries in mdev.conf if you need special > handling (non-standard permissions or scripts executed). > > Marcel> Would my kernel need hotplug enabled ? (I guess it does). > > Yes.