On Sun, 2009-09-20 at 14:56 -0700, Nathan Coulson wrote: > On Sun, Sep 20, 2009 at 11:49 AM, Bruce Dubbs <bruce.du...@gmail.com> wrote: > > Nathan Coulson wrote: > >> I noted that the linux kernel is working on a system called devtmpfs. > >>>From what I have read, it mount's a tmpfs, then populates it (Giving > >> us console, and null, even all the device module nodes before udev > >> runs). It is designed to allow udev to come along later, and > >> replace/update the nodes. > >> > >> This would allow the boot scripts to be simplified, and allow booting > >> with init=/bin/bash w/o additional setup (Other then mounting / > >> readwrite). > >> > >> Information on how it works: > >> http://lwn.net/Articles/330985/ > >> > >> Upstream Status: > >> http://lwn.net/Articles/345480/ > > > > I'm not sure how this affects us. It appears that we remove section 6.2.1. > > Creating Initial Device Nodes (but insist on a specific kernel option). I > > don't > > see anything else. I suppose /dev would be automatically mounted as a > > tmpfs, > > but how does that help someone who is not doing something with an embedded > > system without a disk drive? > > > > What am I missing? > > well, I think it was myself missing something actually. > > When I was suggesting it, I was imagining /dev already existing when > the kernel boots [the fact I still have to mount it on /dev slipped my > mind]. > > It would only have minimal value to the book, if any. There would not > be any changes to the bootscripts.
Right after the CONFIG_DEVTMPFS option, there is CONFIG_DEVTMPFS_MOUNT which when enabled mounts the tmpfs automatically on driver core initialization. This is what you want. I've been using devtmpfs since the first patches were posted, and I really like it. It's the just-works of devfs with the (optional) configurability of udev on top. I haven't simplified my boot scripts and sequence yet, but for the first time in years, I'll get to remove lines instead of adding them. Also, for the people that will run an initramfs for whatever reason, this will make it much simpler, not having to put udev in there. -- http://linuxfromscratch.org/mailman/listinfo/lfs-dev FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
