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TP-LINK MR3020
==============
The TP-LINK MR3020 wireless router has
* Atheros ar9331 SoC;
* 32 MiB SDRAM;
* 4 MiB NOR type SPI Flash Memory;
* RS232 serial interface (LV-TTL levels on board!);
* 1 USB interface;
* 1 Ethernet interfaces;
* 802.11b/g/n (WiFi) interface;
* LEDs & buttons.
The router uses U-Boot 1.1.4 as firmware.
Running barebox
---------------
Barebox can be started from U-Boot using tftp.
But you have to encode barebox image in a very special way.
First obtain ``lzma`` and ``mktplinkfw`` utilities.
The ``lzma`` utility can be obtained in Debian/Ubuntu
distro by installing lzma package
(lzma from xz-utils package is unusable).
The ``mktplinkfw`` utility can be obtained from openwrt, e.g.:
.. code-block:: sh
$ OWRTPREF=https://raw.githubusercontent.com/mirrors/openwrt/master
$ curl -OL $OWRTPREF/tools/firmware-utils/src/mktplinkfw.c \
-OL $OWRTPREF/tools/firmware-utils/src/md5.c \
-OL $OWRTPREF/tools/firmware-utils/src/md5.h
$ cc -o mktplinkfw mktplinkfw.c md5.c
To convert your barebox.bin to U-Boot-loadable image (``6F01A8C0.img``)
use this command sequence:
.. code-block:: sh
$ lzma -c -k barebox-flash-image > barebox.lzma
$ ./mktplinkfw -c -H 0x07200103 -W 1 -N TL-WR720N-v3 \
-s -F 4Mlzma -k barebox.lzma -o 6F01A8C0.img
You must setup tftp-server on host 192.168.0.1.
Put your ``6F01A8C0.img`` to tftp-server directory
(usual ``/tftpboot`` or ``/srv/tftp``).
Connect your board to your tftp-server network via Ethernet.
Next, setup network on MR3020 and run ``6F01A8C0.img``, e.g.:
.. code-block:: console
hornet> set ipaddr 192.168.0.2
hornet> set serverip 192.168.0.1
hornet> tftpboot 0x81000000 6F01A8C0.img
hornet> bootm 0x81000000
Links
-----
* http://www.tp-link.com/en/products/details/?model=TL-MR3020
* http://wiki.openwrt.org/toh/tp-link/tl-mr3020
* https://wikidevi.com/wiki/TP-LINK_TL-MR3020
See also
* http://www.eeboard.com/wp-content/uploads/downloads/2013/08/AR9331.pdf
* http://squonk42.github.io/TL-WR703N/
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