DEBUGFS Support

(host)# cd rootfs

(host)# pwd

/home2/fyodor/filesystem/rootfs

(busybox)# mkdir var/debug

(busybox)# vi etc/fstab

加一行：none  /var/debug    debugfs  ramfs 0  0

(busybox)# modprobe rt73usb

phy0 -> rt2x00_set_chip: Info - Chipset detected - rt: 1300, rf: 0002, rev: 000.
usbcore: registered new interface driver rt73usb

(busybox)# cd /var/debug

(busybox)# ls

drwxr-xr-x    3 0        0               0 Jan  1 00:32 ieee80211
drwxr-xr-x    3 0        0               0 Jan  1 00:00 ohci
drwxr-xr-x    2 0        0               0 Jan  1 00:00 usbmon

rt73的debugfs出來的資訊就在ieee80211裡面