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    ath79: add support for Ubiquiti Picostation M (XM) · 8fa6107a
    Adrian Schmutzler authored
    
    
    This adds support for the Ubiquiti Picostation M (XM), which has the
    same board/LEDs as the Bullet M XM, but different case and antennas.
    
    Specifications:
    - AR7241 SoC @ 400 MHz
    - 32 MB RAM
    - 8 MB SPI flash
    - 1x 10/100 Mbps Ethernet, 24 Vdc PoE-in
    - External antenna: 5 dBi (USA), 2 dBi (EU)
    - POWER/LAN green LEDs
    - 4x RSSI LEDs (red, orange, green, green)
    - UART (115200 8N1) on PCB
    
    Flashing via WebUI:
      Upload the factory image via the stock firmware web UI.
    
      Attention: airOS firmware versions >= 5.6 have a new bootloader with
      an incompatible partition table!
    
      Please downgrade to <= 5.5 _before_ flashing OpenWrt!
      Refer to the device's Wiki page for further information.
    
    Flashing via TFTP:
      Same procedure as other NanoStation M boards.
    
    - Use a pointy tool (e.g., pen cap, paper clip) and keep the reset
      button on the device or on the PoE supply pressed
    - Power on the device via PoE (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_picostation-m-squashfs-factory.bin
    
    Signed-off-by: default avatarAdrian Schmutzler <freifunk@adrianschmutzler.de>
    (cherry picked from commit 6fdaf16d)
    8fa6107a