USB Device Filesystem

The USB device filesystem is a dynamically generated filesystem, similar to the /proc filesystem. This filesystem can be mounted just about anywhere, however it is customarily mounted on /proc/bus/usb, which is an entry node created by the USB code, intended to be used as a mount point for this system. Mounting in other locations may break utilities.

You need to select "Preliminary USB Device Filesystem" to make this work. You also need to enable general /proc support, and to have it mounted (normally automatic).

To mount the filesystem, you need to be root. Use the mount command: mount -t usbdevfs none /proc/bus/usb. Note that the none keyword is arbitrary - you can use anything, and some people prefer to use usbdevfs, as it makes the mount output look better.

none            /proc/bus/usb             usbdevfs        defaults   0   0

dr-xr-xr-x   1 root     root            0 Jan 26 10:40 001
-r--r--r--   1 root     root            0 Jan 26 10:40 devices
-r--r--r--   1 root     root            0 Jan 26 10:40 drivers

Full interpretation of the devices and drivers files is provided later in this guide, in the user's section. Use of the numbered entries is provided later in this guide, in the programmer's guide.