From: Arnout Vandecappelle <arnout@mind.be>
To: buildroot@busybox.net
Subject: [Buildroot] [RFC 2/6] system: clarify /dev management using devtmpfs + {mdev, eudev}
Date: Wed, 9 Sep 2015 11:40:32 +0200 [thread overview]
Message-ID: <55EFFE90.8090200@mind.be> (raw)
In-Reply-To: <1441747734-18730-3-git-send-email-luca@lucaceresoli.net>
On 08-09-15 23:28, Luca Ceresoli wrote:
> We're going to introduce /dev management with mdev only (no devtmpfs),
> which will be called "Dynamic using mdev only".
>
> In preparation to that addition, clarify the current /dev managements
> systems which use devtmpfs with an additional tool. Otherwise
> "Dynamic using mdev" and "Dynamic using mdev only" wight look quite
> undistinguishable to mortals...
I would squash the change to the manual with patch 5/6 and squash the changes
to the Config.in prompts into patch 3/6, since these changes are related.
But the updated text looks good to me, so:
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Oh, perhaps you could add a brief help text to the choice options? You can more
or less copy and paste the text from the manual. If you do add help text, do it
as a separate patch at the end of the series so it doesn't have to be updated
again after the introduction of mdev-only.
Regards,
Arnout
>
> Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
> ---
> docs/manual/configure.txt | 7 ++++---
> system/Config.in | 4 ++--
> 2 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/docs/manual/configure.txt b/docs/manual/configure.txt
> index dd34eef..997be2b 100644
> --- a/docs/manual/configure.txt
> +++ b/docs/manual/configure.txt
> @@ -295,7 +295,7 @@ different solutions to handle the +/dev+ directory :
> responsibility to enable those two options (if you fail to do so,
> your Buildroot system will not boot).
>
> - * The third solution is *Dynamic using mdev*. This method also relies
> + * The third solution is *Dynamic using devtmpfs + mdev*. This method also relies
> on the _devtmpfs_ virtual filesystem detailed above (so the
> requirement to have +CONFIG_DEVTMPFS+ and +CONFIG_DEVTMPFS_MOUNT+
> enabled in the kernel configuration still apply), but adds the
> @@ -314,7 +314,7 @@ different solutions to handle the +/dev+ directory :
> about +mdev+ and the syntax of its configuration file, see
> http://git.busybox.net/busybox/tree/docs/mdev.txt.
>
> - * The fourth solution is *Dynamic using eudev*. This method also
> + * The fourth solution is *Dynamic using devtmpfs + eudev*. This method also
> relies on the _devtmpfs_ virtual filesystem detailed above, but
> adds the +eudev+ userspace daemon on top of it. +eudev+ is a daemon
> that runs in the background, and gets called by the kernel when a
> @@ -327,7 +327,8 @@ different solutions to handle the +/dev+ directory :
> The Buildroot developers recommendation is to start with the *Dynamic
> using devtmpfs only* solution, until you have the need for userspace
> to be notified when devices are added/removed, or if firmwares are
> -needed, in which case *Dynamic using mdev* is usually a good solution.
> +needed, in which case *Dynamic using devtmpfs + mdev* is usually a
> +good solution.
>
> Note that if +systemd+ is chosen as init system, /dev management will
> be performed by the +udev+ program provided by +systemd+.
> diff --git a/system/Config.in b/system/Config.in
> index fad829d..5bf5048 100644
> --- a/system/Config.in
> +++ b/system/Config.in
> @@ -110,11 +110,11 @@ config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_DEVTMPFS
> bool "Dynamic using devtmpfs only"
>
> config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV
> - bool "Dynamic using mdev"
> + bool "Dynamic using devtmpfs + mdev"
> select BR2_PACKAGE_BUSYBOX
>
> config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV
> - bool "Dynamic using eudev"
> + bool "Dynamic using devtmpfs + eudev"
> depends on BR2_USE_WCHAR
> depends on !BR2_STATIC_LIBS
> depends on BR2_USE_MMU # eudev
>
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint: 7493 020B C7E3 8618 8DEC 222C 82EB F404 F9AC 0DDF
next prev parent reply other threads:[~2015-09-09 9:40 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-08 21:28 [Buildroot] [RFC 0/6] mdev-only /dev management (without devtmpfs) Luca Ceresoli
2015-09-08 21:28 ` [Buildroot] [RFC 1/6] Move mounting /sys from fstab to inittab Luca Ceresoli
2015-09-09 9:12 ` Arnout Vandecappelle
2015-09-08 21:28 ` [Buildroot] [RFC 2/6] system: clarify /dev management using devtmpfs + {mdev, eudev} Luca Ceresoli
2015-09-09 9:40 ` Arnout Vandecappelle [this message]
2015-09-09 10:53 ` Luca Ceresoli
2015-09-09 10:54 ` Arnout Vandecappelle
2015-09-08 21:28 ` [Buildroot] [RFC 3/6] system: add mdev-only /dev management (without devtmpfs) Luca Ceresoli
2015-09-09 9:21 ` Arnout Vandecappelle
2015-09-09 12:29 ` Luca Ceresoli
2015-09-09 12:32 ` Arnout Vandecappelle
2015-09-09 13:54 ` Thomas Petazzoni
2015-09-14 13:47 ` Luca Ceresoli
2015-09-14 22:23 ` Arnout Vandecappelle
2015-09-15 22:35 ` Luca Ceresoli
2015-09-14 20:53 ` Peter Korsgaard
2015-09-14 21:34 ` Thomas Petazzoni
2015-09-14 21:38 ` Peter Korsgaard
2015-09-15 7:30 ` Thomas Petazzoni
2015-09-15 8:09 ` Peter Korsgaard
2015-09-15 9:41 ` Thomas Petazzoni
2015-09-15 12:01 ` Peter Korsgaard
2015-09-15 12:27 ` Arnout Vandecappelle
2015-09-15 12:32 ` Peter Korsgaard
2015-09-18 16:37 ` Luca Ceresoli
2015-09-15 13:03 ` Thomas Petazzoni
2015-09-15 13:14 ` Peter Korsgaard
2015-09-15 22:34 ` Luca Ceresoli
2015-10-01 9:36 ` Luca Ceresoli
2015-10-01 10:03 ` Peter Korsgaard
2015-09-15 22:31 ` Luca Ceresoli
2015-09-16 7:32 ` Peter Korsgaard
2015-09-18 15:47 ` Luca Ceresoli
2015-09-09 9:34 ` Arnout Vandecappelle
2015-09-09 11:23 ` Thomas Petazzoni
2015-09-09 11:29 ` Thomas Petazzoni
2015-09-09 20:33 ` Arnout Vandecappelle
2015-09-14 16:07 ` Luca Ceresoli
2015-09-14 16:05 ` Luca Ceresoli
2015-09-14 19:34 ` Thomas Petazzoni
2015-09-14 20:19 ` Arnout Vandecappelle
2015-09-15 22:07 ` Luca Ceresoli
2015-09-08 21:28 ` [Buildroot] [RFC 4/6] system: strip the initial /dev for mdev-only /dev management Luca Ceresoli
2015-09-08 21:28 ` [Buildroot] [RFC 5/6] docs/manual: document "Dynamic using mdev only" " Luca Ceresoli
2015-09-09 10:39 ` Arnout Vandecappelle
2015-09-08 21:28 ` [Buildroot] [RFC 6/6] **** DO NOT COMMIT THIS **** ugly stuff to test mdev-only " Luca Ceresoli
2015-09-09 9:26 ` [Buildroot] [RFC 0/6] mdev-only /dev management (without devtmpfs) Arnout Vandecappelle
2015-09-09 11:30 ` Thomas Petazzoni
2015-09-14 21:03 ` Peter Korsgaard
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