root@OpenWrt:~# ls /dev/
3-1             mtd3            ptmx            usb3
console         mtd3ro          pts             usbdev1.1_ep00
full            mtd4            random          usbdev1.1_ep81
kmem            mtd4ro          root            usbdev2.1_ep00
kmsg            mtdblock0       sda             usbdev2.1_ep81
log             mtdblock1       sda1            usbdev3.1_ep00
mem             mtdblock2       shm             usbdev3.1_ep81
mtd0            mtdblock3       tty             usbdev3.2_ep00
mtd0ro          mtdblock4       ttyS0           usbdev3.2_ep02
mtd1            net             ttyS1           usbdev3.2_ep81
mtd1ro          null            urandom         usbdev3.2_ep83
mtd2            port            usb1            zero
mtd2ro          ppp             usb2