From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To: buildroot@busybox.net
Subject: [Buildroot] Device files and Buildroot
Date: Sat, 3 Dec 2011 19:40:00 +0100 [thread overview]
Message-ID: <20111203194000.1c6a1bc7@skate> (raw)
In-Reply-To: <CAHUNapQdgYL7a6DdKW4COasRKUREmvfhJEncAW_OaWp4TA_2yQ@mail.gmail.com>
Le Sat, 3 Dec 2011 07:53:51 -0500,
Trevor Woerner <twoerner@gmail.com> a ?crit :
> Excellent write-up. Does buildroot's /dev handling also tweak
> /etc/fstab? I would assume /dev would only need to be mounted in the
> non-static cases.
Two cases here :
* Static /dev. In this case /dev is part of the root filesystem
itself, so there is no need for anything special in /etc/fstab.
* Dynamic /dev (either with devtmpfs only, or with devtmpfs+mdev or
devtmpfs+udev). In this case, we use the CONFIG_DEVTMPFS_MOUNT
kernel option, which tells the kernel to automatically mount the
devtmpfs filesystem at boot time. So the root filesystem simply
contains a /dev directory, completely empty. Nothing is needed
in /etc/fstab: the kernel will mount devtmpfs in /dev automatically.
The only special case here is when the root filesystem is an
initramfs: for some reason, the kernel does not mount devtmpfs
automatically in this case, but Buildroot installs a special /init
wrapper script, which mounts devtmpfs before starting the real init.
But even in this case, nothing special is needed in /etc/fstab.
Does that answer your question?
Thomas
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
next prev parent reply other threads:[~2011-12-03 18:40 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-22 20:51 [Buildroot] equivalent of a 'make modules' Jeff Krasky
2011-11-22 22:04 ` Thomas Petazzoni
2011-11-22 22:11 ` Jeff Krasky
2011-11-22 22:29 ` Thomas Petazzoni
2011-11-22 22:35 ` Jeff Krasky
2011-11-23 7:19 ` Thomas De Schampheleire
2011-11-23 21:38 ` [Buildroot] LIBFOO_SITE in .mk file Jeff Krasky
2011-11-23 22:43 ` Jeff Krasky
2011-11-24 8:15 ` Thomas De Schampheleire
2011-11-28 15:07 ` Jeff Krasky
2011-11-28 15:11 ` Thomas Petazzoni
2011-11-28 15:19 ` Jeff Krasky
2011-11-28 15:54 ` Thomas Petazzoni
2011-11-28 16:14 ` Jeff Krasky
2011-11-28 17:39 ` Michael S. Zick
2011-11-28 18:50 ` Jeff Krasky
2011-11-28 19:24 ` Michael S. Zick
2011-11-28 19:33 ` Jeff Krasky
2011-11-28 21:14 ` Jeff Krasky
2011-11-28 22:15 ` Jeff Krasky
2011-11-29 7:37 ` Thomas Petazzoni
2011-11-29 14:28 ` Jeff Krasky
2011-11-29 14:36 ` Thomas Petazzoni
2011-11-29 14:43 ` Jeff Krasky
2011-11-29 21:43 ` Jeff Krasky
2011-11-29 22:42 ` Jeff Krasky
2011-11-30 15:59 ` Jeff Krasky
2011-11-30 16:04 ` Thomas Petazzoni
2011-11-30 16:20 ` Jeff Krasky
2011-11-30 16:33 ` Thomas Petazzoni
2011-11-30 16:38 ` Jeff Krasky
2011-11-30 16:49 ` Michael S. Zick
2011-11-30 16:57 ` Jeff Krasky
2011-11-30 17:08 ` Michael S. Zick
2011-11-30 17:48 ` Thomas De Schampheleire
2011-11-30 17:58 ` Thomas Petazzoni
2011-11-30 18:11 ` Jeff Krasky
2011-11-30 19:31 ` Jeff Krasky
2011-11-30 19:44 ` Thomas De Schampheleire
2011-11-30 20:01 ` Jeff Krasky
2011-11-30 22:21 ` Thomas Petazzoni
[not found] ` <001201ccafb0$4b5e06e0$0400a8c0@dspcgrnzks9p98>
2011-11-30 22:49 ` Thomas Petazzoni
2011-11-30 22:54 ` Jeff Krasky
2011-12-01 8:11 ` Thomas Petazzoni
2011-12-01 14:58 ` Jeff Krasky
2011-12-01 15:03 ` Michael S. Zick
2011-12-01 15:55 ` Jeff Krasky
2011-12-01 16:16 ` Jeff Krasky
2011-12-01 16:33 ` Jeff Krasky
2011-12-01 16:52 ` Michael S. Zick
2011-12-01 18:15 ` Jeff Krasky
2011-12-01 22:56 ` Jeff Krasky
2011-12-02 7:50 ` Thomas De Schampheleire
2011-12-02 8:50 ` Thomas Petazzoni
2011-12-02 13:33 ` Michael S. Zick
2011-12-02 15:57 ` Jeff Krasky
2011-12-02 16:09 ` Quotient Remainder
2011-12-02 16:51 ` [Buildroot] Kernel panic - not syncing: Attempted to kill init! Jeff Krasky
2011-12-02 16:59 ` Jeff Krasky
2011-12-02 17:33 ` Tim Judd
2011-12-02 18:02 ` Jeff Krasky
2011-12-02 18:21 ` Aleksander Dutkowski
2011-12-02 18:30 ` Jeff Krasky
2011-12-03 0:25 ` Aleksander Dutkowski
2011-12-03 8:25 ` [Buildroot] Device files and Buildroot Thomas Petazzoni
2011-12-03 12:53 ` Trevor Woerner
2011-12-03 18:40 ` Thomas Petazzoni [this message]
2011-12-05 10:54 ` Aleksander Dutkowski
2011-12-08 21:30 ` Felipe Contreras
2011-12-08 23:49 ` Michael S. Zick
2011-12-09 18:49 ` Thomas Petazzoni
2011-12-02 18:31 ` [Buildroot] Kernel panic - not syncing: Attempted to kill init! Tim Judd
2011-12-02 18:24 ` Tim Judd
2011-11-29 14:54 ` [Buildroot] LIBFOO_SITE in .mk file Michael S. Zick
2011-11-29 7:35 ` Thomas Petazzoni
2011-11-28 18:55 ` Quotient Remainder
2011-11-28 19:02 ` Jeff Krasky
2011-11-29 7:31 ` Thomas Petazzoni
2011-11-23 8:25 ` [Buildroot] equivalent of a 'make modules' Thomas Petazzoni
2011-11-23 14:17 ` Jeff Krasky
2011-11-23 14:23 ` Thomas Petazzoni
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