tiny udev on ARM

tiny udev on ARM

[Pelle Svensson]

Hi

What is the minimum I need for a simple set-up?

I have following now, but it is not working... need some help.
Do I need all this?

/sbin/udev 39388 bytes
/sbin/udevd 22468 bytes
/sbin/udevend 5588 bytes
/sbin/udevstart 39356 bytes
/usr/bin/udevinfo 27028 bytes
/usr/bin/udevtest 38820 bytes
/udev emphty
/etc/udev/udev.conf 321 bytes rw-r--r--
/etc/udev/rules.d/50-udev.rules 1531 bytes rw-r--r--
/etc/rc.d/rc.start_udev 627 bytes rwxr-xr-x (copied from extras)
call rc.start during inittab

/Pelle

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Re: tiny udev on ARM

[Kay Sievers]

On Tue, Jun 14, 2005 at 05:39:14PM +0200, Pelle Svensson wrote:
> 
> Hi
> 
> What is the minimum I need for a simple set-up?
> 
> I have following now, but it is not working... need some help.
> Do I need all this?
> 
> /sbin/udev 39388 bytes
> /sbin/udevd 22468 bytes
> /sbin/udevend 5588 bytes
> /sbin/udevstart 39356 bytes
> /usr/bin/udevinfo 27028 bytes
> /usr/bin/udevtest 38820 bytes
> /udev emphty
> /etc/udev/udev.conf 321 bytes rw-r--r--
> /etc/udev/rules.d/50-udev.rules 1531 bytes rw-r--r--
> /etc/rc.d/rc.start_udev 627 bytes rwxr-xr-x (copied from extras)
> call rc.start during inittab

Well nobody can tell you. It completely depends on what you want to do.
You can do anything from just using /sbin/udev invoked from the kernel-forked
hotplug-helper or in contrast serialize everything through the udevsend/udevd
daemon to get "managed" events or disable kernel-event forking completely
and use netlink instead.
Or do hotplug event replay from initramfs instead of using udevstart, and so
on...

Kay


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Re: tiny udev on ARM

[Pelle Svensson]

Hi Kay,

Basicaly I want the smallest possible with basic standard devices and
with USB add and remove detecting.

More or less same as devfs.

/Pelle

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Re: tiny udev on ARM

[David Brownell]

On Tuesday 14 June 2005 8:39 am, Pelle Svensson wrote:
> 
> What is the minimum I need for a simple set-up?

I've got a pretty minimal setup getting generated from "buildroot"
lately, completely replacing devfs.  Get the latest from SVN then
apply the patch "br2-udev-v2.patch" from the entry in bugthing.


> I have following now, but it is not working... need some help.
> Do I need all this?
> 
> /sbin/udev 39388 bytes
> /sbin/udevd 22468 bytes
> /sbin/udevend 5588 bytes
> /sbin/udevstart 39356 bytes
> /usr/bin/udevinfo 27028 bytes
> /usr/bin/udevtest 38820 bytes

That is, pretty much what udev-058 installs.
Probably only "udev" and "udevstart" are really
essential in the current install setup ... but
I didn't want to play too many games just now.


> /udev emphty

... I made buildroot completely replace /dev, using ramfs and
populating it with "udevstart".


> /etc/udev/udev.conf 321 bytes rw-r--r--
> /etc/udev/rules.d/50-udev.rules 1531 bytes rw-r--r--

That looks like the default rules.  I made buildroot use the
rules from "frugalware" since the defaults use nasty permissions,
like "/dev/zero" and "/dev/null" not being world-readable (so
that many programs can't start or run).


> /etc/rc.d/rc.start_udev 627 bytes rwxr-xr-x (copied from extras)
> call rc.start during inittab

I trimmed down the "start_udev" a bit, but yes it wanted to
be started from inittab (before "mount -a").


One thing that's also missing is a really trimmed-down hotplug.
Yes, some of that can come from making "udev" itself replace
the /sbin/hotplug, but that won't modprobe.  Plus, the new
"pcmcia-utils" (cardmgr vanishing at last, yay!) currently
wants some hotplug support.

- Dave



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