6. 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.
6.1. 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.
The mktplinkfw utility can be obtained from openwrt, e.g.:
$ 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:
$ lzma -c -k barebox.bin > barebox.lzma
$ ./FW/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.:
hornet> set ipaddr 192.168.0.2
hornet> set serverip 192.168.0.1
hornet> tftpboot 0x81000000 6F01A8C0.img
hornet> bootm 0x81000000
