[PATCH v2] ath79: add support for Ubiquiti PowerBeam M (XW)

[Joe Ayers]

> Subject: [PATCH v2] ath79: add support for Ubiquiti PowerBeam M (XW)
> Message-ID: <20210523115946.711907-1-russell at personaltelco.net>
>
> This patch adds support for the Ubiquiti PowerBeam M (XW), e.g. PBE-M5-400,
> a 802.11n wireless with a feed+dish form factor. This device was previously
> supported by the ar71xx loco-m-xw firmware.
>
> Specifications:
>  - Atheros AR9342 SoC
>  - 64 MB RAM
>  - 8 MB SPI flash
>  - 1x 10/100 Mbps Ethernet port, 24 Vdc PoE-in
>  - Power and LAN green LEDs
>  - 4x RSSI LEDs (red, orange, green, green)
>  - UART (115200 8N1)
>
> Flashing via stock GUI:
>  - WARNING: flashing OpenWrt from AirOS v5.6 or newer will brick your

This was resolved by the following commit and has not been an issue
for some time:
https://github.com/openwrt/openwrt/commit/076d58d3440f382c536ea8874f58b0df23c263bc


>    device! Read the wiki for more info.
>  - Downgrade to AirOS v5.5.x (latest available is 5.5.10-u2) first.
>  - Upload the factory image via AirOS web GUI.
>
> Flashing via TFTP:
>  - WARNING: flashing OpenWrt from AirOS v5.6 or newer will brick your
>    device! Read the wiki for more info.
>  - Downgrade to AirOS v5.5.x (latest available is 5.5.10-u2) first.
>  - Use a pointy tool (e.g., unbent paperclip) to keep the
>    reset button pressed.
>  - Power on the device (keep reset button pressed).
>  - Keep pressing until LEDs flash alternatively LED1+LED3 =>
>    LED2+LED4 => LED1+LED3, etc.
>  - Release reset button.
>  - The device starts a TFTP server at 192.168.1.20.
>  - Set a static IP on the computer (e.g., 192.168.1.21/24).
>  - Upload via tftp the factory image:
>     $ tftp 192.168.1.20
>     tftp> bin
>     tftp> trace
>     tftp> put openwrt-ath79-generic-xxxxx-ubnt_powerbeam-m-xw-squashfs-factory.bin
>