Hi,
In the embedded application that I'm working on, I need to mount USB
mass storage devices when they are plugged in.
After going through the documentation, it seems that Linux hotplug
could help in achieving this. For this, CONFIG_HOTPLUG was enabled
using make menuconfig. When Linux comes up, I see that
- "cat /proc/sys/kernel/hotplug" gives "/sbin/hotplug", but such
a file (/sbin/hotplug) is not there.
- Creating my own /sbin/hotplug which echoes "hotplug" to
/root/log does not echo "hotplug" to /root/log when I insert or remove
a USB mass storage device. This shows that /sbin/hotplug is not
getting invoked.
- If a USB mass storage device is plugged in, the USB subsystem
identifies it. After this, if busybox mdev (which, I believe, is a
scaled down version of udev, but not a daemon) is run,
/dev/device_file is getting created. The device could be mounted
using the command "mount -t vfat /dev/device_file /mnt". (busybox
mdev allows automating this mounting through its conf file)
1. Is there any other configuration that is required to make USB hotplug work?
2. To achieve USB hotplug, is there a better (in terms of memory
usage as well) way than hooking busybox mdev to USB hotplug trigger?
I feel that things could fall in place if I could get this USB hotplug
working. It would be great if someone could help me out with this.
Thanks,
-Sujith
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