OpenWRT

From Leo's Notes
This page was last edited on 26 August 2018, at 16:51.

Hardware

Raspberry Pi 2 v1.2

OpenWRT does not list an official image for the Raspberry Pi 2 v1.2 board. Neither the Pi 3 or Pi 2 image works. This is because the Raspberry Pi 2 v1.2 board uses the bcm2710 SOC (same as the Pi 3) but both images don't properly handle the Pi 2 v1.2 board and as such, both versions fail to boot.

To get OpenWRT to work on this board, image the SD card with the bcm2710 image (the Pi 3 version) and then:

  1. Mount /boot
  2. Copy bcm2710-rpi-3-b.dtb to bcm2709-rpi-2-b.dtb

A copy can be found at https://github.com/raspberrypi/firmware/raw/master/boot/bcm2710-rpi-3-b.dtb to bcm2709-rpi-2-b.dtb.

Buffalo WZR-600HP

Flashing OpenWRT from DD-WRT was very straight forward. There is an issue with getting USB working however.

Links:

Flashing (on stock firmware): 

# cd /tmp
# scp foo@host:~/openwrt-18.06.1-ar71xx-generic-wzr-600dhp-squashfs-sysupgrade.bin .
# mtd -r write openwrt-18.06.1-ar71xx-generic-wzr-600dhp-squashfs-sysupgrade.bin linux
## This may take about 1-2 minutes, and the -r will automatically reboot the device

USB support?

  • opkg install kmod-usb-printer
  • opkg install usbutils


  • opkg install kmod-usb-ohci kmod-usb2

I am only seeing: 

root@buffalo:/dev/bus/usb/001# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@buffalo:/dev# lsmod | grep usb
ledtrig_usbport         2160  0
nls_base                4736  1 usbcore
usb_common              1312  1 usbcore
usbcore               118528  4 usblp,ledtrig_usbport,ehci_platform,ehci_hcd
usblp                   8480  0
root@buffalo:/dev# dmesg | grep -i usb
[    6.651469] usbcore: registered new interface driver usbfs
[    6.657039] usbcore: registered new interface driver hub
[    6.662464] usbcore: registered new device driver usb
[    6.671682] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    6.690631] ehci-platform ehci-platform: new USB bus registered, assigned bus number 1
[    6.727198] ehci-platform ehci-platform: USB 2.0 started, EHCI 1.00
[    6.734199] hub 1-0:1.0: USB hub found
[   12.263746] usbcore: registered new interface driver usblp
root@buffalo:~# uname -a
Linux buffalo 4.9.120 #0 Thu Aug 16 07:51:15 2018 mips GNU/Linux

There should be a device at /dev/usb/lp... but there isn't using OpenWRT 18.01. This definitely worked with the stock firmware. LEDE 17.01 was unable to detect any USB devices at all.

Reverting to Stock Firmware

# arp -s 192.168.11.1 02:aa:bb:cc:dd:20
## Type the following, but don't run the PUT command just yet.
## Power on the device. When the router's link light blinks on startup, press the enter key.
# tftp 192.168.11.1
tftp> binary
tftp> rexmt 1
tftp> timeout 60 
tftp> trace 
Packet tracing on.
tftp> put wzr600dhp-pro-v3.0-r30356.enc

## The transfer took about 33 seconds and the diagnostic light will blink rapidly initially, then followed by a slightly slower blink. It took another 5 or so minutes for it to come online afterwards.

## Clear the ARP table:
arp -d 192.168.11.1

The router will be accessible at 192.168.11.1 with the new stock firmware.