Hi Alan, Thanks for the reply. Yes, my /sbin/hotplug script works as intended if run manually. Like you said, running the whole udev is not feasible due to the memory constraints. Regards, -Sujith On Mon, Nov 2, 2009 at 4:01 PM, Alan Jenkins <sourcejedi.lkml@xxxxxxxxxxxxxx> wrote: > 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
