From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Raj Kumar Yadav" <rajkumaryadav@gmail.com>
Date: Wed, 11 Oct 2006 09:21:38 +0000
Subject: udev and hotplug
Message-Id: <3ce7faa90610110209x41cc26a3x506368f9e950d56a@mail.gmail.com>
List-Id: <linux-hotplug.vger.kernel.org>
References: <dvkdta$4ai$1@sea.gmane.org>
In-Reply-To: <dvkdta$4ai$1@sea.gmane.org>
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To: linux-hotplug@vger.kernel.org

Hi,
    I am using udev-100 on linux-2.6.14.
    To make udev work, the kernel built options are following.

    Device Drivers  --->
     Generic Driver Options  --->
        <*> Hotplug firmware loading support

    File systems  --->
     [*] Inotify file change notification support

    During the bootup, one time initialization of the /dev using "udevstart"
    and afterwards running the "udevd" as daemon. The udev rules are working
      as expected on every insertion/removal of devices.

    However, would like to clarify some minor doubts.

    1. Why do I need to enable "Hotplug firmware loading support"
option, when
        it seems that the "inotify" is passing all needed information to udevd.

       "cat /proc/sys/kernel/hotplug" shows "/sbin/hotplug". But there is no
         file as "/sbin/hotplug".

       According to the link hotplug is redundant now, but then why do I need to
         enable the hotplug configuration in kernel 2.6.14.
       http://vrfy.org/log/recent-state-of-udev.html

    2. As it seems udev is providing all required functionality, Do one really
       need to implement "hal" to exploit udev functionality.

    3. Is it necessary to run "udevstart" to populate the /dev directory, should
         it not be populated by the udevd internally. Please correct me, If I am
       mixing two unrelated components.


Thanks All,
Raj Kumar Yadav

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