Add support for new device

For Developers
7

Then you should start with this:

https://git.openwrt.org/?p=openwrt/openwrt.git;a=commitdiff;h=64493d42b41253aafe1538e325e0692db4201046;hp=046263095e007ba80bdf3525de32d7cce11734e8

ath79: add support for 8devices Carambola2 development board

Specifications:
- Atheros AR9331 (400 MHz)
- 64 MB of RAM (DDR2)
- 16 MB of Flash (SPI)
- 1T1R 2.4 Wlan (AR9331)
- 2x 10/100 Mbps Ethernet
- 3x LEDs, 1x gpio button
- 1x USB 2.0, 5V
- UART over usb, 115200n8

You should just duplicate that (and the possible later commits for the device). If you have deviated from that in your hardware / bootloader design, just modify the hardware definition in DTS accordingly.

You may also see interesting generic DTS discussion in Porting guide ar71xx to ath79? thread.