On Tue, Jun 03, 2008 at 10:44:26PM +0800, Bernard Blackham wrote:
> Hi,
>
> When I switched from udev+udevd to mdev, booting was much faster and it
> shaved a decent amount from the total image size.
That's why I switched from udev to mdev--it's much, much smaller!
> However, I've recently
> noticed device nodes sometimes disappearing on boot. The specific
> scenario is:
>
> 1. /dev/ttyS1 exists as a device node in the filesystem on boot - prior
> to the actual device existing, and prior to mdev being called.
Is that because you're using a serial console? It is in my case.
> 2. echo /bin/mdev > /proc/sys/kernel/hotplug
Good, that's per documentation. Did you also do this?
mdev -s
> 3. a module is loaded that provides ttyS1
I'm running a non-modular kernel.
> When this module is loaded, most of the time the existing ttyS1 remains.
> Sometimes however, it is unlinked from the filesystem and is never seen
> again (until mdev -s is run, or next boot, maybe).
Do you mean you need to do "mdev -s" more than once?
My startup (/etc/init.d/rcS) is:
mount -t proc none /proc
mount -t sysfs none /sys
echo /sbin/mdev > /proc/sys/kernel/hotplug
/sbin/mdev -s
This works quite reliably for me w/ busybox-1.8.2.
--
David N. Lombard, Intel, Irvine, CA
I do not speak for Intel Corporation; all comments are strictly my own.
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