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Our Linux kernel is 2.6.31 running on an embedded MIPS processor with busybox.

The initialisation script (rcS) starts mdev with:

echo "/sbin/stbhotplug" > /proc/sys/kernel/hotplug
mdev -s

Can anyone tell me what the Linux utility mdev does?

It looks like it does auto hot plugging as the stbhotplug is a script that handle ethernet interfaces.

Also, the rootfs we have been given only has a console device i.e. /dev/console is the only file in /dev.

However, when the system is running, the /dev directory is full of device files (e.g. /dev/mtd, etc.).

The reason I ask is that occasionally we get an error whereby it is reported that /dev/ubi_ctrl is not found or /dev/ubi1 is not found.

How or when does Linux create these devices?

Thanks.

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migrated from stackoverflow.com Aug 19 '11 at 16:16

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2 Answers 2

up vote 1 down vote accepted

Here is a link to the mdev primer.

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Awesome - thank you. –  user626201 Jul 26 '11 at 10:04

mdev is a light-weight alternative to udev for usage in embedded devices. Both handle the creation of device files in /dev and starting of actions when certain events happen.

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So if /dev devices are not being created, could be a problem with mdev or a timing issue? –  user626201 May 3 '11 at 12:49
    
Yes, as far as I understand both could be true. But I only wrote the answer because I had just read about mdev in a news article yesterday. Generally I have no experience with it and cannot give any further assistance. That's why I posted my answer as a kick-start for a community wiki answer. –  halo May 3 '11 at 14:07

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