On 11/2/09, Sujith Sankar <sujithsankar1@xxxxxxxxx> wrote: > 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. Stupid question here - I take it you tried running /sbin/hotplug manually, and checking that it does the right thing? > - 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? I don't think so. > 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? Hooking mdev seems a perfectly good way to do this. There's no obvious alternative, unless you want to run the full udev daemon instead... and I don't think that would make it any easier. > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
