On 16/03/2011 12:24, Matthew Lear wrote: > Hi, > > I'm working on an embedded Linux platform using 2.6.32.16. I've > successfully patched the kernel and, following a few tweaks, cross > compiled the aufs user space tools. > > I'd like to use aufs for the project. One thing that is puzzling me at > the moment is how I could use aufs to allow /dev on my r/o root file > system to be r/w. This is so that hw vendor supplied drivers can run > mknod in their insmod script.
Dunno about Debian, but most people simply mount dev in some kind of tempfs? I would have to check, but my gentoo boot scripts do this as a matter of course when starting udev, they first check if they can mount devpts, if not then they mount I think tempfs? Note devtmpfs is probably what you want to start with? Mount this to /dev and the kernel will create basic nodes for all devices on your system. mdev/udev then can start much later in the process and basically becomes simply a bunch of scripts to link/rename/adj permissions, to your dev nodes... It may well be that devtmpfs is all you need and you can ditch mdev/udev..? I'm reasonably sure it's there in 2.6.32? (If you need some special customisation to what devtmpfs gives you then you can run a boot script or unpack some tar file?) Good luck Ed W ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d
